ffmpeg concat 与使用图像背景的视频
ffmpeg concat with video using image background
Ffmpeg 无法使用各种测试正确连接媒体文件。其中一个视频是之前使用 .mp3 和 jpeg 背景生成的 .mp4（h264 编解码器）视频。我已经尝试使用各种标志进行测试，最接近的是下面的最终输出。
我的主要问题是当前测试的最终视频，当两个视频拼接在一起后，音频延迟了大约 3 秒。
以下是我正在使用的所有文件：
输入文件：
输出文件：
files.txt
file '/tmp/new_image_video.mp4'
file '/tmp/main_video.mp4'
图像视频创建：
ffmpeg -loop 1 -i /tmp/image.jpg -i /tmp/audio.mp3 -acodec libfdk_aac -framerate 30 -vcodec libx264 -shortest /tmp/new_image_video_raw.mp4
第二部分：
ffmpeg -threads 0 -i /tmp/new_image_video_raw.mp4 -vf "scale=w=560:h=320:force_original_aspect_ratio=decrease, pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -qp 20 -ar 44100 -r 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -shortest -movflags +faststart /tmp/new_image_video.mp4 -y
主视频转码：
ffmpeg -i /tmp/main_video_raw.mp4 -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -movflags +faststart /tmp/main_video.mp4 -y
连接视频：
ffmpeg -threads 0 -f concat -safe 0 -i /tmp/files.txt -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -preset veryslow -crf 15 -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -movflags +faststart /tmp/final_output_video.mp4 -y
new_image_video.mp4
的输出
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 0x150ce00] using SAR=1/1
[libx264 @ 0x150ce00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x150ce00] profile High, level 2.1
[libx264 @ 0x150ce00] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:-3:-3 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=2.00:0.70 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-4 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.20
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
encoder : Lavf57.76.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], q=-1--1, 1 fps, 16384 tbn, 1 tbc
Metadata:
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 157 kb/s
Metadata:
encoder : Lavc56.41
frame= 73 fps=0.0 q=17.0 Lsize= 362kB time=00:00:16.00 bitrate= 185.3kbits/s speed=88.6x
video:49kB audio:308kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.166542%
[libx264 @ 0x150ce00] frame I:1 Avg QP: 4.09 size: 38729
[libx264 @ 0x150ce00] frame P:18 Avg QP: 5.77 size: 843
[libx264 @ 0x150ce00] frame B:54 Avg QP: 0.64 size: 49
[libx264 @ 0x150ce00] consecutive B-frames: 1.4% 0.0% 0.0% 98.6%
[libx264 @ 0x150ce00] mb I I16..4: 54.6% 18.9% 26.6%
[libx264 @ 0x150ce00] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 9.1% 0.1% 0.5% 0.0% 0.0% skip:90.3%
[libx264 @ 0x150ce00] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 2.6% 0.0% 0.0% direct: 0.0% skip:97.4% L0:69.1% L1:30.9% BI: 0.0%
[libx264 @ 0x150ce00] 8x8 transform intra:18.9% inter:59.9%
[libx264 @ 0x150ce00] coded y,uvDC,uvAC intra: 44.1% 45.3% 45.0% inter: 1.4% 0.0% 0.0%
[libx264 @ 0x150ce00] i16 v,h,dc,p: 91% 2% 6% 1%
[libx264 @ 0x150ce00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 18% 8% 5% 6% 7% 9% 7%
[libx264 @ 0x150ce00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 16% 8% 7% 10% 9% 10% 9% 9%
[libx264 @ 0x150ce00] i8c dc,h,v,p: 71% 12% 12% 5%
[libx264 @ 0x150ce00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x150ce00] ref P L0: 79.3% 0.1% 19.5% 1.1%
[libx264 @ 0x150ce00] ref B L0: 68.3% 30.5% 1.2%
[libx264 @ 0x150ce00] ref B L1: 98.4% 1.6%
[libx264 @ 0x150ce00] kb/s:6.20
new_image_video.mp4（第 2 部分）的输出
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/new_image_video_raw.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Duration: 00:00:19.00, start: 0.000000, bitrate: 156 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], 21 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 157 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (mp3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x2175560] using SAR=1/1
[libx264 @ 0x2175560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x2175560] profile High, level 3.0
[libx264 @ 0x2175560] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x2150cc0] Starting second pass: moving the moov atom to the beginning of the file drop=0 speed=31.6x
frame= 569 fps=0.0 q=-1.0 Lsize= 351kB time=00:00:18.86 bitrate= 152.3kbits/s dup=579 drop=0 speed=32.5x
video:81kB audio:251kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.851973%
[libx264 @ 0x2175560] frame I:3 Avg QP:17.00 size: 23393
[libx264 @ 0x2175560] frame P:143 Avg QP:20.00 size: 26
[libx264 @ 0x2175560] frame B:423 Avg QP:21.67 size: 19
[libx264 @ 0x2175560] consecutive B-frames: 0.9% 0.0% 0.0% 99.1%
[libx264 @ 0x2175560] mb I I16..4: 54.7% 26.0% 19.4%
[libx264 @ 0x2175560] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.1% 0.0% 0.0% 0.0% 0.0% skip:99.9%
[libx264 @ 0x2175560] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.2% 0.0% 0.0% direct: 0.0% skip:99.7% L0:23.7% L1:76.3% BI: 0.0%
[libx264 @ 0x2175560] 8x8 transform intra:26.0% inter:14.0%
[libx264 @ 0x2175560] coded y,uvDC,uvAC intra: 39.8% 44.1% 43.4% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x2175560] i16 v,h,dc,p: 91% 3% 5% 1%
[libx264 @ 0x2175560] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 17% 15% 8% 6% 9% 6% 8% 8%
[libx264 @ 0x2175560] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 17% 6% 7% 10% 9% 11% 10% 9%
[libx264 @ 0x2175560] i8c dc,h,v,p: 71% 11% 13% 5%
[libx264 @ 0x2175560] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x2175560] ref P L0: 95.4% 0.7% 3.9%
[libx264 @ 0x2175560] ref B L0: 44.6% 55.4%
[libx264 @ 0x2175560] ref B L1: 98.3% 1.7%
[libx264 @ 0x2175560] kb/s:34.62
main_video.mp4
的输出
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/main_video_raw.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:01:02.32, start: 0.000000, bitrate: 1347 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 959 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x758900] using SAR=64/63
[libx264 @ 0x758900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x758900] profile High, level 2.1
[libx264 @ 0x758900] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/main_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 560x320 [SAR 64:63 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x755900] Starting second pass: moving the moov atom to the beginning of the file11.1x
frame= 1557 fps=275 q=-1.0 Lsize= 5144kB time=00:01:02.32 bitrate= 676.1kbits/s speed= 11x
video:4119kB audio:975kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.989500%
[libx264 @ 0x758900] frame I:13 Avg QP:17.00 size: 34937
[libx264 @ 0x758900] frame P:657 Avg QP:20.00 size: 3546
[libx264 @ 0x758900] frame B:887 Avg QP:21.69 size: 1615
[libx264 @ 0x758900] consecutive B-frames: 18.9% 12.6% 8.1% 60.4%
[libx264 @ 0x758900] mb I I16..4: 12.5% 51.8% 35.7%
[libx264 @ 0x758900] mb P I16..4: 0.2% 1.9% 1.0% P16..4: 17.9% 9.3% 8.4% 0.0% 0.0% skip:61.3%
[libx264 @ 0x758900] mb B I16..4: 0.1% 0.3% 0.3% B16..8: 18.0% 5.6% 2.4% direct: 2.8% skip:70.6% L0:33.9% L1:42.5% BI:23.6%
[libx264 @ 0x758900] 8x8 transform intra:55.4% inter:56.4%
[libx264 @ 0x758900] coded y,uvDC,uvAC intra: 84.0% 93.3% 75.0% inter: 12.6% 14.9% 3.3%
[libx264 @ 0x758900] i16 v,h,dc,p: 8% 38% 3% 51%
[libx264 @ 0x758900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 20% 8% 7% 9% 9% 10% 10% 11%
[libx264 @ 0x758900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 9% 8% 11% 10% 10% 9% 9%
[libx264 @ 0x758900] i8c dc,h,v,p: 41% 26% 17% 16%
[libx264 @ 0x758900] Weighted P-Frames: Y:0.2% UV:0.0%
[libx264 @ 0x758900] ref P L0: 72.3% 14.4% 9.7% 3.6% 0.0%
[libx264 @ 0x758900] ref B L0: 89.9% 7.7% 2.4%
[libx264 @ 0x758900] ref B L1: 97.1% 2.9%
[libx264 @ 0x758900] kb/s:541.66
concat 输出：
ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags='-L/root/ffmpeg_build/lib -ldl' --bindir=/root/bin --pkg-config-flags=--static --enable-gpl --enable-version3 --disable-debug --enable-shared --enable-runtime-cpudetect --enable-postproc --enable-pic --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libass --enable-libvidstab --enable-libsoxr --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libwebp --enable-fontconfig --enable-libspeex --enable-nonfree
libavutil 55. 73.100 / 55. 73.100
libavcodec 57.102.100 / 57.102.100
libavformat 57. 76.100 / 57. 76.100
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 98.100 / 6. 98.100
libswscale 4. 7.102 / 4. 7.102
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/main_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:01:02.32, start: 0.000000, bitrate: 1347 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 959 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x1563900] using SAR=64/63
[libx264 @ 0x1563900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x1563900] profile High, level 2.1
[libx264 @ 0x1563900] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 560x320 [SAR 64:63 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x1560900] Starting second pass: moving the moov atom to the beginning of the file1.2x
frame= 1557 fps=277 q=-1.0 Lsize= 5144kB time=00:01:02.32 bitrate= 676.1kbits/s speed=11.1x
video:4119kB audio:975kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.989500%
[libx264 @ 0x1563900] frame I:13 Avg QP:17.00 size: 34937
[libx264 @ 0x1563900] frame P:657 Avg QP:20.00 size: 3546
[libx264 @ 0x1563900] frame B:887 Avg QP:21.69 size: 1615
[libx264 @ 0x1563900] consecutive B-frames: 18.9% 12.6% 8.1% 60.4%
[libx264 @ 0x1563900] mb I I16..4: 12.5% 51.8% 35.7%
[libx264 @ 0x1563900] mb P I16..4: 0.2% 1.9% 1.0% P16..4: 17.9% 9.3% 8.4% 0.0% 0.0% skip:61.3%
[libx264 @ 0x1563900] mb B I16..4: 0.1% 0.3% 0.3% B16..8: 18.0% 5.6% 2.4% direct: 2.8% skip:70.6% L0:33.9% L1:42.5% BI:23.6%
[libx264 @ 0x1563900] 8x8 transform intra:55.4% inter:56.4%
[libx264 @ 0x1563900] coded y,uvDC,uvAC intra: 84.0% 93.3% 75.0% inter: 12.6% 14.9% 3.3%
[libx264 @ 0x1563900] i16 v,h,dc,p: 8% 38% 3% 51%
[libx264 @ 0x1563900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 20% 8% 7% 9% 9% 10% 10% 11%
[libx264 @ 0x1563900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 9% 8% 11% 10% 10% 9% 9%
[libx264 @ 0x1563900] i8c dc,h,v,p: 41% 26% 17% 16%
[libx264 @ 0x1563900] Weighted P-Frames: Y:0.2% UV:0.0%
[libx264 @ 0x1563900] ref P L0: 72.3% 14.4% 9.7% 3.6% 0.0%
[libx264 @ 0x1563900] ref B L0: 89.9% 7.7% 2.4%
[libx264 @ 0x1563900] ref B L1: 97.1% 2.9%
[libx264 @ 0x1563900] kb/s:541.66
main_video.mp4 音轨似乎是可变的。我能够通过对视频进行转码来使其正常工作：
ffmpeg -i /tmp/main_video_raw.mp4 -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -x264-params "nal-hrd=cbr" -b:v 2500K -minrate 2500K -maxrate 2500K -bufsize 2M -shortest -max_muxing_queue_size 9999 -movflags +faststart /tmp/main_video.mp4 -y
Ffmpeg 无法使用各种测试正确连接媒体文件。其中一个视频是之前使用 .mp3 和 jpeg 背景生成的 .mp4（h264 编解码器）视频。我已经尝试使用各种标志进行测试，最接近的是下面的最终输出。
我的主要问题是当前测试的最终视频，当两个视频拼接在一起后，音频延迟了大约 3 秒。
以下是我正在使用的所有文件：
输入文件：
输出文件：
files.txt
file '/tmp/new_image_video.mp4'
file '/tmp/main_video.mp4'
图像视频创建：
ffmpeg -loop 1 -i /tmp/image.jpg -i /tmp/audio.mp3 -acodec libfdk_aac -framerate 30 -vcodec libx264 -shortest /tmp/new_image_video_raw.mp4
第二部分：
ffmpeg -threads 0 -i /tmp/new_image_video_raw.mp4 -vf "scale=w=560:h=320:force_original_aspect_ratio=decrease, pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -qp 20 -ar 44100 -r 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -shortest -movflags +faststart /tmp/new_image_video.mp4 -y
主视频转码：
ffmpeg -i /tmp/main_video_raw.mp4 -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -movflags +faststart /tmp/main_video.mp4 -y
连接视频：
ffmpeg -threads 0 -f concat -safe 0 -i /tmp/files.txt -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -preset veryslow -crf 15 -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -movflags +faststart /tmp/final_output_video.mp4 -y
new_image_video.mp4
的输出Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 0x150ce00] using SAR=1/1
[libx264 @ 0x150ce00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x150ce00] profile High, level 2.1
[libx264 @ 0x150ce00] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:-3:-3 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=2.00:0.70 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-4 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.20
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
encoder : Lavf57.76.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], q=-1--1, 1 fps, 16384 tbn, 1 tbc
Metadata:
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 157 kb/s
Metadata:
encoder : Lavc56.41
frame= 73 fps=0.0 q=17.0 Lsize= 362kB time=00:00:16.00 bitrate= 185.3kbits/s speed=88.6x
video:49kB audio:308kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.166542%
[libx264 @ 0x150ce00] frame I:1 Avg QP: 4.09 size: 38729
[libx264 @ 0x150ce00] frame P:18 Avg QP: 5.77 size: 843
[libx264 @ 0x150ce00] frame B:54 Avg QP: 0.64 size: 49
[libx264 @ 0x150ce00] consecutive B-frames: 1.4% 0.0% 0.0% 98.6%
[libx264 @ 0x150ce00] mb I I16..4: 54.6% 18.9% 26.6%
[libx264 @ 0x150ce00] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 9.1% 0.1% 0.5% 0.0% 0.0% skip:90.3%
[libx264 @ 0x150ce00] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 2.6% 0.0% 0.0% direct: 0.0% skip:97.4% L0:69.1% L1:30.9% BI: 0.0%
[libx264 @ 0x150ce00] 8x8 transform intra:18.9% inter:59.9%
[libx264 @ 0x150ce00] coded y,uvDC,uvAC intra: 44.1% 45.3% 45.0% inter: 1.4% 0.0% 0.0%
[libx264 @ 0x150ce00] i16 v,h,dc,p: 91% 2% 6% 1%
[libx264 @ 0x150ce00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 18% 8% 5% 6% 7% 9% 7%
[libx264 @ 0x150ce00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 16% 8% 7% 10% 9% 10% 9% 9%
[libx264 @ 0x150ce00] i8c dc,h,v,p: 71% 12% 12% 5%
[libx264 @ 0x150ce00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x150ce00] ref P L0: 79.3% 0.1% 19.5% 1.1%
[libx264 @ 0x150ce00] ref B L0: 68.3% 30.5% 1.2%
[libx264 @ 0x150ce00] ref B L1: 98.4% 1.6%
[libx264 @ 0x150ce00] kb/s:6.20
new_image_video.mp4（第 2 部分）的输出
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/new_image_video_raw.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Duration: 00:00:19.00, start: 0.000000, bitrate: 156 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], 21 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 157 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (mp3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x2175560] using SAR=1/1
[libx264 @ 0x2175560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x2175560] profile High, level 3.0
[libx264 @ 0x2175560] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 560x320 [SAR 1:1 DAR 7:4], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x2150cc0] Starting second pass: moving the moov atom to the beginning of the file drop=0 speed=31.6x
frame= 569 fps=0.0 q=-1.0 Lsize= 351kB time=00:00:18.86 bitrate= 152.3kbits/s dup=579 drop=0 speed=32.5x
video:81kB audio:251kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.851973%
[libx264 @ 0x2175560] frame I:3 Avg QP:17.00 size: 23393
[libx264 @ 0x2175560] frame P:143 Avg QP:20.00 size: 26
[libx264 @ 0x2175560] frame B:423 Avg QP:21.67 size: 19
[libx264 @ 0x2175560] consecutive B-frames: 0.9% 0.0% 0.0% 99.1%
[libx264 @ 0x2175560] mb I I16..4: 54.7% 26.0% 19.4%
[libx264 @ 0x2175560] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.1% 0.0% 0.0% 0.0% 0.0% skip:99.9%
[libx264 @ 0x2175560] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.2% 0.0% 0.0% direct: 0.0% skip:99.7% L0:23.7% L1:76.3% BI: 0.0%
[libx264 @ 0x2175560] 8x8 transform intra:26.0% inter:14.0%
[libx264 @ 0x2175560] coded y,uvDC,uvAC intra: 39.8% 44.1% 43.4% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x2175560] i16 v,h,dc,p: 91% 3% 5% 1%
[libx264 @ 0x2175560] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 17% 15% 8% 6% 9% 6% 8% 8%
[libx264 @ 0x2175560] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 17% 6% 7% 10% 9% 11% 10% 9%
[libx264 @ 0x2175560] i8c dc,h,v,p: 71% 11% 13% 5%
[libx264 @ 0x2175560] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x2175560] ref P L0: 95.4% 0.7% 3.9%
[libx264 @ 0x2175560] ref B L0: 44.6% 55.4%
[libx264 @ 0x2175560] ref B L1: 98.3% 1.7%
[libx264 @ 0x2175560] kb/s:34.62
main_video.mp4
的输出Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/main_video_raw.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:01:02.32, start: 0.000000, bitrate: 1347 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 959 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x758900] using SAR=64/63
[libx264 @ 0x758900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x758900] profile High, level 2.1
[libx264 @ 0x758900] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/main_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 560x320 [SAR 64:63 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x755900] Starting second pass: moving the moov atom to the beginning of the file11.1x
frame= 1557 fps=275 q=-1.0 Lsize= 5144kB time=00:01:02.32 bitrate= 676.1kbits/s speed= 11x
video:4119kB audio:975kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.989500%
[libx264 @ 0x758900] frame I:13 Avg QP:17.00 size: 34937
[libx264 @ 0x758900] frame P:657 Avg QP:20.00 size: 3546
[libx264 @ 0x758900] frame B:887 Avg QP:21.69 size: 1615
[libx264 @ 0x758900] consecutive B-frames: 18.9% 12.6% 8.1% 60.4%
[libx264 @ 0x758900] mb I I16..4: 12.5% 51.8% 35.7%
[libx264 @ 0x758900] mb P I16..4: 0.2% 1.9% 1.0% P16..4: 17.9% 9.3% 8.4% 0.0% 0.0% skip:61.3%
[libx264 @ 0x758900] mb B I16..4: 0.1% 0.3% 0.3% B16..8: 18.0% 5.6% 2.4% direct: 2.8% skip:70.6% L0:33.9% L1:42.5% BI:23.6%
[libx264 @ 0x758900] 8x8 transform intra:55.4% inter:56.4%
[libx264 @ 0x758900] coded y,uvDC,uvAC intra: 84.0% 93.3% 75.0% inter: 12.6% 14.9% 3.3%
[libx264 @ 0x758900] i16 v,h,dc,p: 8% 38% 3% 51%
[libx264 @ 0x758900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 20% 8% 7% 9% 9% 10% 10% 11%
[libx264 @ 0x758900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 9% 8% 11% 10% 10% 9% 9%
[libx264 @ 0x758900] i8c dc,h,v,p: 41% 26% 17% 16%
[libx264 @ 0x758900] Weighted P-Frames: Y:0.2% UV:0.0%
[libx264 @ 0x758900] ref P L0: 72.3% 14.4% 9.7% 3.6% 0.0%
[libx264 @ 0x758900] ref B L0: 89.9% 7.7% 2.4%
[libx264 @ 0x758900] ref B L1: 97.1% 2.9%
[libx264 @ 0x758900] kb/s:541.66
concat 输出：
ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags='-L/root/ffmpeg_build/lib -ldl' --bindir=/root/bin --pkg-config-flags=--static --enable-gpl --enable-version3 --disable-debug --enable-shared --enable-runtime-cpudetect --enable-postproc --enable-pic --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libass --enable-libvidstab --enable-libsoxr --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libwebp --enable-fontconfig --enable-libspeex --enable-nonfree
libavutil 55. 73.100 / 55. 73.100
libavcodec 57.102.100 / 57.102.100
libavformat 57. 76.100 / 57. 76.100
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 98.100 / 6. 98.100
libswscale 4. 7.102 / 4. 7.102
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/main_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:01:02.32, start: 0.000000, bitrate: 1347 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 959 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x1563900] using SAR=64/63
[libx264 @ 0x1563900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x1563900] profile High, level 2.1
[libx264 @ 0x1563900] 264 - core 152 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=10 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=20 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to '/tmp/new_image_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.76.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 560x320 [SAR 64:63 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc57.102.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
encoder : Lavc57.102.100 libfdk_aac
[mp4 @ 0x1560900] Starting second pass: moving the moov atom to the beginning of the file1.2x
frame= 1557 fps=277 q=-1.0 Lsize= 5144kB time=00:01:02.32 bitrate= 676.1kbits/s speed=11.1x
video:4119kB audio:975kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.989500%
[libx264 @ 0x1563900] frame I:13 Avg QP:17.00 size: 34937
[libx264 @ 0x1563900] frame P:657 Avg QP:20.00 size: 3546
[libx264 @ 0x1563900] frame B:887 Avg QP:21.69 size: 1615
[libx264 @ 0x1563900] consecutive B-frames: 18.9% 12.6% 8.1% 60.4%
[libx264 @ 0x1563900] mb I I16..4: 12.5% 51.8% 35.7%
[libx264 @ 0x1563900] mb P I16..4: 0.2% 1.9% 1.0% P16..4: 17.9% 9.3% 8.4% 0.0% 0.0% skip:61.3%
[libx264 @ 0x1563900] mb B I16..4: 0.1% 0.3% 0.3% B16..8: 18.0% 5.6% 2.4% direct: 2.8% skip:70.6% L0:33.9% L1:42.5% BI:23.6%
[libx264 @ 0x1563900] 8x8 transform intra:55.4% inter:56.4%
[libx264 @ 0x1563900] coded y,uvDC,uvAC intra: 84.0% 93.3% 75.0% inter: 12.6% 14.9% 3.3%
[libx264 @ 0x1563900] i16 v,h,dc,p: 8% 38% 3% 51%
[libx264 @ 0x1563900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 20% 8% 7% 9% 9% 10% 10% 11%
[libx264 @ 0x1563900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 9% 8% 11% 10% 10% 9% 9%
[libx264 @ 0x1563900] i8c dc,h,v,p: 41% 26% 17% 16%
[libx264 @ 0x1563900] Weighted P-Frames: Y:0.2% UV:0.0%
[libx264 @ 0x1563900] ref P L0: 72.3% 14.4% 9.7% 3.6% 0.0%
[libx264 @ 0x1563900] ref B L0: 89.9% 7.7% 2.4%
[libx264 @ 0x1563900] ref B L1: 97.1% 2.9%
[libx264 @ 0x1563900] kb/s:541.66
main_video.mp4 音轨似乎是可变的。我能够通过对视频进行转码来使其正常工作：
ffmpeg -i /tmp/main_video_raw.mp4 -vf "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih), pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2" -acodec libfdk_aac -af aresample=resampler=soxr -ar 44100 -aspect 16:9 -qp 20 -framerate 30 -ab 128k -ac 1 -vcodec libx264 -x264-params "nal-hrd=cbr" -b:v 2500K -minrate 2500K -maxrate 2500K -bufsize 2M -shortest -max_muxing_queue_size 9999 -movflags +faststart /tmp/main_video.mp4 -y