ffmpeg - 使用去隔行提取每秒第一帧的脚本
ffmpeg - script to extract 1st frame of each second with deinterlacing
我正在尝试编写一个 shell 脚本，通过使用视频的每一秒的第一帧作为基础来分析一些视频。我正在使用 ffmpeg 来提取帧。当 this thread 在我的搜索中出现时，我认为我会获得金牌，但它不处理去隔行扫描。
我使用的是一种基于时间的方法，只要视频是渐进式的，它就适用于各种格式。它不适用于隔行扫描视频（在这种情况下仅输出第一个场，创建半高图像）。我尝试了去隔行扫描 (yadif/bwdif) 与 select 的各种组合，但我创建的过滤器链要么导致错误，要么仍然是 return 一半大小的图像。
这是我的 w/a 滤镜，适用于渐进式视频源：
ffmpeg -i $infile -vf "select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))" -vsync 0 $outfile
以下仍然是 return 隔行扫描源的半高图像：
... -vf "bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"
... -vf "bwdif=0,select='between(mod(n\,$ips)\,1\,2)'" -- $ips 是每秒图像数
... -vf "select='between(mod(n\,$ips)\,1\,2)',bwdif=0"
我也尝试了上述 w/explicit 帧参考的各种排列（-r、-vframes、...），仍然没有快乐。
有人可以帮我解决语法问题吗？
--编辑--
这里是运行带有第一个过滤器的命令的完整输出：
ffmpeg version N-104925-gfe95731e3d-g68457c1e85+3 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11.2.0 (Rev5, Built by MSYS2 project)
configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfribidi --enable-libgme --enable-libilbc --enable-libsvthevc --enable-libsvtvp9 --enable-libkvazaar --enable-libmodplug --enable-librist --enable-librtmp --enable-librubberband --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-openal --enable-libcodec2 --enable-ladspa --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libxavs2 --enable-libuavs3d --enable-opencl --enable-opengl --enable-libopenh264 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree --extra-cflags=-DAL_LIBTYPE_STATIC --extra-cflags='-IC:/ffab/local64/include' --extra-cflags='-IC:/ffab/local64/include/AL'
libavutil 57. 11.100 / 57. 11.100
libavcodec 59. 14.100 / 59. 14.100
libavformat 59. 10.100 / 59. 10.100
libavdevice 59. 0.101 / 59. 0.101
libavfilter 8. 20.100 / 8. 20.100
libswscale 6. 1.101 / 6. 1.101
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mxf, from 'mire-720-576-16-9.mxf':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
company_name : FFmpeg
product_name : OP1a Muxer
product_version_num: 58.38.100.0.0
product_version : 58.38.100
toolkit_version_num: 58.38.100.0.0
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
timecode : 00:00:00:00
Duration: 00:02:00.00, start: 0.000000, bitrate: 55987 kb/s
Stream #0:0: Video: jpeg2000, yuv422p10le(top first), 720x288, lossless, SAR 32:45 DAR 16:9, 50 tbr, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
Stream #0:1: Audio: pcm_s24le, 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Sound
Stream mapping:
Stream #0:0 -> #0:0 (jpeg2000 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'testout%04d.png':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
timecode : 00:00:00:00
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
product_version_num: 58.38.100.0.0
toolkit_version_num: 58.38.100.0.0
encoder : Lavf59.10.100
Stream #0:0: Video: png, rgb48be(pc, gbr/unknown/unknown, progressive), 720x288 [SAR 32:45 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
encoder : Lavc59.14.100 png
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frame= 118 fps=1.7 q=-0.0 size=N/A time=00:01:56.02 bitrate=N/A speed=1.66x
frame= 118 fps=1.7 q=-0.0 size=N/A time=00:01:56.02 bitrate=N/A speed=1.65x
frame= 119 fps=1.7 q=-0.0 size=N/A time=00:01:57.02 bitrate=N/A speed=1.65x
frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.65x
frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.63x
frame= 120 fps=1.7 q=-0.0 Lsize=N/A time=00:01:59.02 bitrate=N/A speed=1.64x
video:43029kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
您的输入被检测为隔行扫描，但具有半高 (288) 和双倍帧率 (50)。这可能是由于 JPEG2000 数据包中的边界标记缺失或无法识别。我假设这是 PAL --> 720x576@25i.
首先尝试使用 tinterlace 过滤器将输入“帧”交错为双倍高度和半帧，然后继续原来的过滤器序列。
"tinterlace=mode=merge,bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"
我正在尝试编写一个 shell 脚本，通过使用视频的每一秒的第一帧作为基础来分析一些视频。我正在使用 ffmpeg 来提取帧。当 this thread 在我的搜索中出现时，我认为我会获得金牌，但它不处理去隔行扫描。
我使用的是一种基于时间的方法，只要视频是渐进式的，它就适用于各种格式。它不适用于隔行扫描视频（在这种情况下仅输出第一个场，创建半高图像）。我尝试了去隔行扫描 (yadif/bwdif) 与 select 的各种组合，但我创建的过滤器链要么导致错误，要么仍然是 return 一半大小的图像。
这是我的 w/a 滤镜，适用于渐进式视频源：
ffmpeg -i $infile -vf "select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))" -vsync 0 $outfile
以下仍然是 return 隔行扫描源的半高图像：
... -vf "bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"
... -vf "bwdif=0,select='between(mod(n\,$ips)\,1\,2)'" -- $ips 是每秒图像数
... -vf "select='between(mod(n\,$ips)\,1\,2)',bwdif=0"
我也尝试了上述 w/explicit 帧参考的各种排列（-r、-vframes、...），仍然没有快乐。
有人可以帮我解决语法问题吗？
--编辑--
这里是运行带有第一个过滤器的命令的完整输出：
ffmpeg version N-104925-gfe95731e3d-g68457c1e85+3 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11.2.0 (Rev5, Built by MSYS2 project)
configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfribidi --enable-libgme --enable-libilbc --enable-libsvthevc --enable-libsvtvp9 --enable-libkvazaar --enable-libmodplug --enable-librist --enable-librtmp --enable-librubberband --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-openal --enable-libcodec2 --enable-ladspa --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libxavs2 --enable-libuavs3d --enable-opencl --enable-opengl --enable-libopenh264 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree --extra-cflags=-DAL_LIBTYPE_STATIC --extra-cflags='-IC:/ffab/local64/include' --extra-cflags='-IC:/ffab/local64/include/AL'
libavutil 57. 11.100 / 57. 11.100
libavcodec 59. 14.100 / 59. 14.100
libavformat 59. 10.100 / 59. 10.100
libavdevice 59. 0.101 / 59. 0.101
libavfilter 8. 20.100 / 8. 20.100
libswscale 6. 1.101 / 6. 1.101
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mxf, from 'mire-720-576-16-9.mxf':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
company_name : FFmpeg
product_name : OP1a Muxer
product_version_num: 58.38.100.0.0
product_version : 58.38.100
toolkit_version_num: 58.38.100.0.0
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
timecode : 00:00:00:00
Duration: 00:02:00.00, start: 0.000000, bitrate: 55987 kb/s
Stream #0:0: Video: jpeg2000, yuv422p10le(top first), 720x288, lossless, SAR 32:45 DAR 16:9, 50 tbr, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
Stream #0:1: Audio: pcm_s24le, 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Sound
Stream mapping:
Stream #0:0 -> #0:0 (jpeg2000 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'testout%04d.png':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
timecode : 00:00:00:00
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
product_version_num: 58.38.100.0.0
toolkit_version_num: 58.38.100.0.0
encoder : Lavf59.10.100
Stream #0:0: Video: png, rgb48be(pc, gbr/unknown/unknown, progressive), 720x288 [SAR 32:45 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
encoder : Lavc59.14.100 png
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frame= 1 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed= 0x
frame= 2 fps=1.8 q=-0.0 size=N/A time=00:00:00.02 bitrate=N/A speed=0.0177x
frame= 3 fps=1.8 q=-0.0 size=N/A time=00:00:01.02 bitrate=N/A speed=0.617x
frame= 4 fps=1.9 q=-0.0 size=N/A time=00:00:02.02 bitrate=N/A speed=0.938x
frame= 5 fps=1.9 q=-0.0 size=N/A time=00:00:03.02 bitrate=N/A speed=1.13x
frame= 6 fps=1.9 q=-0.0 size=N/A time=00:00:04.02 bitrate=N/A speed=1.26x
frame= 6 fps=1.6 q=-0.0 size=N/A time=00:00:04.02 bitrate=N/A speed=1.09x
frame= 7 fps=1.7 q=-0.0 size=N/A time=00:00:05.02 bitrate=N/A speed=1.19x
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frame= 13 fps=1.8 q=-0.0 size=N/A time=00:00:11.02 bitrate=N/A speed= 1.5x
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frame= 25 fps=1.8 q=-0.0 size=N/A time=00:00:23.02 bitrate=N/A speed=1.64x
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frame= 110 fps=1.8 q=-0.0 size=N/A time=00:01:48.02 bitrate=N/A speed=1.73x
frame= 111 fps=1.8 q=-0.0 size=N/A time=00:01:49.02 bitrate=N/A speed=1.73x
frame= 111 fps=1.7 q=-0.0 size=N/A time=00:01:49.02 bitrate=N/A speed=1.71x
frame= 112 fps=1.7 q=-0.0 size=N/A time=00:01:50.02 bitrate=N/A speed=1.71x
frame= 112 fps=1.7 q=-0.0 size=N/A time=00:01:50.02 bitrate=N/A speed= 1.7x
frame= 113 fps=1.7 q=-0.0 size=N/A time=00:01:51.02 bitrate=N/A speed= 1.7x
frame= 113 fps=1.7 q=-0.0 size=N/A time=00:01:51.02 bitrate=N/A speed=1.69x
frame= 114 fps=1.7 q=-0.0 size=N/A time=00:01:52.02 bitrate=N/A speed=1.69x
frame= 115 fps=1.7 q=-0.0 size=N/A time=00:01:53.02 bitrate=N/A speed=1.69x
frame= 115 fps=1.7 q=-0.0 size=N/A time=00:01:53.02 bitrate=N/A speed=1.68x
frame= 116 fps=1.7 q=-0.0 size=N/A time=00:01:54.02 bitrate=N/A speed=1.68x
frame= 116 fps=1.7 q=-0.0 size=N/A time=00:01:54.02 bitrate=N/A speed=1.67x
frame= 117 fps=1.7 q=-0.0 size=N/A time=00:01:55.02 bitrate=N/A speed=1.67x
frame= 117 fps=1.7 q=-0.0 size=N/A time=00:01:55.02 bitrate=N/A speed=1.66x
frame= 118 fps=1.7 q=-0.0 size=N/A time=00:01:56.02 bitrate=N/A speed=1.66x
frame= 118 fps=1.7 q=-0.0 size=N/A time=00:01:56.02 bitrate=N/A speed=1.65x
frame= 119 fps=1.7 q=-0.0 size=N/A time=00:01:57.02 bitrate=N/A speed=1.65x
frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.65x
frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.63x
frame= 120 fps=1.7 q=-0.0 Lsize=N/A time=00:01:59.02 bitrate=N/A speed=1.64x
video:43029kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
您的输入被检测为隔行扫描，但具有半高 (288) 和双倍帧率 (50)。这可能是由于 JPEG2000 数据包中的边界标记缺失或无法识别。我假设这是 PAL --> 720x576@25i.
首先尝试使用 tinterlace 过滤器将输入“帧”交错为双倍高度和半帧，然后继续原来的过滤器序列。
"tinterlace=mode=merge,bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"