Azure Function 上的 FFmpeg 调用 运行 缓慢并生成空输出文件
FFmpeg on Azure Function call running slowly and producing an empty output file
我正在尝试制作一个使用 ffmpeg 的函数，到目前为止，除了 -version 命令之外，我还没有其他任何东西可以正常工作。当我尝试 运行 一个简单的 ffmpeg -i {input file path} {output file path} 命令时，函数似乎卡住了 3-4 分钟（在创建空输出文件的过程中），然后重试并产生错误 'file already exists'.我试过使用函数 运行ning 在 64 位 ffmpeg.exe 和 32 位 ffmpeg.exe 之间切换，同时作为 32 位和 64 位函数。我的代码和尝试 运行 代码的相关日志包含在下面，如果有人能告诉我我做错了什么或如何使流程正常工作，我们将不胜感激。在此先感谢 Cuan
编辑：该过程在具有相同文件的 kudu 上运行，输出显示在底部。在 kudu 上，进程 运行 不到半分钟，显然是某些原因导致函数进程挂起，如果有人有建议，我们将不胜感激。再次感谢，爨
第二次编辑：我尝试将 -y 添加到我的命令末尾，这样做的原因是它不再抱怨覆盖，但可惜它现在由于超时而挂起两次。 （底部输出）
编辑第三：azure有办法让你运行在本地运行，我的函数运行在本地版本上也有同样的问题但是：事实证明实际处理完成了在几秒钟内，它只需要永远决定写入文件 - 如果您在进程 运行ning ~ 10 秒后手动终止进程，文件将立即写入。再次感谢您的帮助。爨。
Run.csx:
using System.Net;
using System;
using System.Diagnostics;
using System.ComponentModel;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
log.Info("C# HTTP trigger function processed a request.");
Process process = new Process();
process.StartInfo.FileName = @"D:\home\site\wwwroot\HttpTestFunction\ffmpeg64.exe";
string tmp = String.Format("-i \"" + "Airdocs Background Video.mp4" + "\" \"" + "tmpOut2.mp4" + "\"");
log.Info("ffmpeg argument is: "+tmp);
process.StartInfo.Arguments = tmp;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.WorkingDirectory = @"D:\home\site\wwwroot\HttpTestFunction";
process.Start();
log.Info("process started");
string output = process.StandardOutput.ReadToEnd();
string err = process.StandardError.ReadToEnd();
log.Info("output:" + output);
log.Info("error:"+err);
process.WaitForExit();
}
日志：
2017-10-14T02:17:10.514 Function started (Id=e4ec7d1e-2bcb-4b74-8af2-15124f1576fb)
2017-10-14T02:17:10.639 C# HTTP trigger function processed a request.
2017-10-14T02:17:10.639 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4"
2017-10-14T02:17:10.779 process started
2017-10-14T02:18:15 No new trace in the past 1 min(s).
2017-10-14T02:19:15 No new trace in the past 2 min(s).
2017-10-14T02:20:15 No new trace in the past 3 min(s).
2017-10-14T02:21:02.188 Function started (Id=b2ae9b59-8933-42e3-986c-fd26a6886285)
2017-10-14T02:21:02.188 C# HTTP trigger function processed a request.
2017-10-14T02:21:02.188 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4"
2017-10-14T02:21:02.252 process started
2017-10-14T02:21:02.377 output:
2017-10-14T02:21:02.377 error:ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 76.100 / 55. 76.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.101 / 57. 82.101
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Airdocs Background Video.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
creation_time : 2017-09-08T11:55:11.000000Z
Duration: 00:00:24.02, start: 0.000000, bitrate: 105 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 104 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : AVC Coding
File 'tmpOut2.mp4' already exists. Overwrite ? [y/N] Not overwriting - exiting
2017-10-14T02:21:02.392 Function completed (Success, Id=b2ae9b59-8933-42e3-986c-fd26a6886285, Duration=205ms)
2017-10-14T02:22:10.563 Function completed (Failure, Id=e4ec7d1e-2bcb-4b74-8af2-15124f1576fb, Duration=300047ms)
2017-10-14T02:22:10.610 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
Kudu 代码（只是 运行 直接使用 ffmpeg 命令，而不是 run.csx 文件）：
D:\home\site\wwwroot\HttpTestFunction>ffmpeg -i "Airdocs Background Video.mp4" tmpout3.mp4
ffmpeg version N-87196-g6cadbb1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 74.100 / 55. 74.100
libavcodec 57.105.100 / 57.105.100
libavformat 57. 81.100 / 57. 81.100
libavdevice 57. 8.100 / 57. 8.100
libavfilter 6.101.100 / 6.101.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Airdocs Background Video.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
creation_time : 2017-09-08T11:55:11.000000Z
Duration: 00:00:24.02, start: 0.000000, bitrate: 105 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 104 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : AVC Coding
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 00000000005fc5a0] using SAR=1/1
[libx264 @ 00000000005fc5a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 00000000005fc5a0] profile High, level 3.2
[libx264 @ 00000000005fc5a0] 264 - core 152 r2851 ba24899 - 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=1 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_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'tmpout3.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
encoder : Lavf57.81.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30.30 fps, 16k tbn, 30.30 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : Lavc57.105.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 728 fps= 39 q=29.0 Lsize= 62kB time=00:00:23.92 bitrate= 21.1kbits/s speed=1.28x
video:52kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 17.915474%
[libx264 @ 00000000005fc5a0] frame I:4 Avg QP:12.46 size: 6102
[libx264 @ 00000000005fc5a0] frame P:184 Avg QP:16.94 size: 45
[libx264 @ 00000000005fc5a0] frame B:540 Avg QP:20.50 size: 37
[libx264 @ 00000000005fc5a0] consecutive B-frames: 1.1% 0.0% 0.0% 98.9%
[libx264 @ 00000000005fc5a0] mb I I16..4: 66.3% 30.4% 3.3%
[libx264 @ 00000000005fc5a0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%
[libx264 @ 00000000005fc5a0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:12.3% L1:87.7% BI: 0.0%
[libx264 @ 00000000005fc5a0] 8x8 transform intra:30.5% inter:14.3%
[libx264 @ 00000000005fc5a0] coded y,uvDC,uvAC intra: 2.3% 2.2% 2.1% inter: 0.0% 0.0% 0.0%
[libx264 @ 00000000005fc5a0] i16 v,h,dc,p: 93% 6% 2% 0%
[libx264 @ 00000000005fc5a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 41% 31% 0% 0% 0% 0% 0% 0%
[libx264 @ 00000000005fc5a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 17% 16% 5% 4% 5% 6% 3% 5%
[libx264 @ 00000000005fc5a0] i8c dc,h,v,p: 93% 6% 1% 0%
[libx264 @ 00000000005fc5a0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000000005fc5a0] ref B L1: 98.2% 1.8%
[libx264 @ 00000000005fc5a0] kb/s:17.57
D:\home\site\wwwroot\HttpTestFunction>
使用 -y 命令在 azure 上输出
2017-10-25T04:34:45.519 Compilation succeeded.
2017-10-25T04:34:46.160 Function started (Id=18880991-c93a-42a3-96b6-7df283e3bdb4)
2017-10-25T04:34:46.300 C# HTTP trigger function processed a request.
2017-10-25T04:34:46.300 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4" -y
2017-10-25T04:34:46.394 process started
2017-10-25T04:36:46 No new trace in the past 1 min(s).
2017-10-25T04:37:46 No new trace in the past 2 min(s).
2017-10-25T04:38:37.947 Function started (Id=c7f7f768-c53b-4074-a0c2-8391848bbd80)
2017-10-25T04:38:37.963 C# HTTP trigger function processed a request.
2017-10-25T04:38:37.963 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4" -y
2017-10-25T04:38:38.025 process started
2017-10-25T04:39:46 No new trace in the past 1 min(s).
2017-10-25T04:39:46.258 Function completed (Failure, Id=18880991-c93a-42a3-96b6-7df283e3bdb4, Duration=300079ms)
2017-10-25T04:39:46.321 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
File 'tmpOut2.mp4' already exists. Overwrite ? [y/N] Not overwriting - exiting
您可以在您的命令中添加 -y 选项来覆盖输出文件而无需询问，如下所示：
ffmpeg -i {input file path} {output file path} -y
更多选项，您可以参考here。
此外，您可以利用 kudu 来测试转换，如下所示：
2017-10-14T02:22:10.610 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
看来您使用的是动态 SKU。正如host.json提到的关于functionTimeout的内容如下：
Value indicating the timeout duration for all functions.
- In Dynamic SKUs, the valid range is from 1 second to 10 minutes and the default value is 5 minutes.
- In Paid SKUs there is no limit and the default value is null (indicating no timeout).
注意：如果对话会花费很多时间，您需要增加functionTimeout或更改SKU类型。此外，对于付费 SKU，您需要启用 Always On 功能，更多详情请参阅 here.
事实证明，整个问题是由
引起的
string output = process.StandardOutput.ReadToEnd();
string err = process.StandardError.ReadToEnd();
ffmpeg 运行有很多 output/error 消息，这使缓冲区超载并导致整个事情挂起。解决方案是让这个过程逐个发生
process.OutputDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("O: "+e.Data);
}
);
process.ErrorDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("E: "+e.Data);
}
);
//start process
process.Start();
log.Info("process started");
process.BeginOutputReadLine();
process.BeginErrorReadLine();
process.WaitForExit();
使用它而不是 'ReadToEnd()' 解决了我所有的问题，它现在可以正常工作并且仍在捕获输出和错误行。
我正在尝试制作一个使用 ffmpeg 的函数，到目前为止，除了 -version 命令之外，我还没有其他任何东西可以正常工作。当我尝试 运行 一个简单的 ffmpeg -i {input file path} {output file path} 命令时，函数似乎卡住了 3-4 分钟（在创建空输出文件的过程中），然后重试并产生错误 'file already exists'.我试过使用函数 运行ning 在 64 位 ffmpeg.exe 和 32 位 ffmpeg.exe 之间切换，同时作为 32 位和 64 位函数。我的代码和尝试 运行 代码的相关日志包含在下面，如果有人能告诉我我做错了什么或如何使流程正常工作，我们将不胜感激。在此先感谢 Cuan
编辑：该过程在具有相同文件的 kudu 上运行，输出显示在底部。在 kudu 上，进程 运行 不到半分钟，显然是某些原因导致函数进程挂起，如果有人有建议，我们将不胜感激。再次感谢，爨
第二次编辑：我尝试将 -y 添加到我的命令末尾，这样做的原因是它不再抱怨覆盖，但可惜它现在由于超时而挂起两次。 （底部输出）
编辑第三：azure有办法让你运行在本地运行，我的函数运行在本地版本上也有同样的问题但是：事实证明实际处理完成了在几秒钟内，它只需要永远决定写入文件 - 如果您在进程 运行ning ~ 10 秒后手动终止进程，文件将立即写入。再次感谢您的帮助。爨。
Run.csx:
using System.Net;
using System;
using System.Diagnostics;
using System.ComponentModel;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
log.Info("C# HTTP trigger function processed a request.");
Process process = new Process();
process.StartInfo.FileName = @"D:\home\site\wwwroot\HttpTestFunction\ffmpeg64.exe";
string tmp = String.Format("-i \"" + "Airdocs Background Video.mp4" + "\" \"" + "tmpOut2.mp4" + "\"");
log.Info("ffmpeg argument is: "+tmp);
process.StartInfo.Arguments = tmp;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.WorkingDirectory = @"D:\home\site\wwwroot\HttpTestFunction";
process.Start();
log.Info("process started");
string output = process.StandardOutput.ReadToEnd();
string err = process.StandardError.ReadToEnd();
log.Info("output:" + output);
log.Info("error:"+err);
process.WaitForExit();
}
日志：
2017-10-14T02:17:10.514 Function started (Id=e4ec7d1e-2bcb-4b74-8af2-15124f1576fb)
2017-10-14T02:17:10.639 C# HTTP trigger function processed a request.
2017-10-14T02:17:10.639 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4"
2017-10-14T02:17:10.779 process started
2017-10-14T02:18:15 No new trace in the past 1 min(s).
2017-10-14T02:19:15 No new trace in the past 2 min(s).
2017-10-14T02:20:15 No new trace in the past 3 min(s).
2017-10-14T02:21:02.188 Function started (Id=b2ae9b59-8933-42e3-986c-fd26a6886285)
2017-10-14T02:21:02.188 C# HTTP trigger function processed a request.
2017-10-14T02:21:02.188 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4"
2017-10-14T02:21:02.252 process started
2017-10-14T02:21:02.377 output:
2017-10-14T02:21:02.377 error:ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 76.100 / 55. 76.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.101 / 57. 82.101
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Airdocs Background Video.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
creation_time : 2017-09-08T11:55:11.000000Z
Duration: 00:00:24.02, start: 0.000000, bitrate: 105 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 104 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : AVC Coding
File 'tmpOut2.mp4' already exists. Overwrite ? [y/N] Not overwriting - exiting
2017-10-14T02:21:02.392 Function completed (Success, Id=b2ae9b59-8933-42e3-986c-fd26a6886285, Duration=205ms)
2017-10-14T02:22:10.563 Function completed (Failure, Id=e4ec7d1e-2bcb-4b74-8af2-15124f1576fb, Duration=300047ms)
2017-10-14T02:22:10.610 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
Kudu 代码（只是 运行 直接使用 ffmpeg 命令，而不是 run.csx 文件）：
D:\home\site\wwwroot\HttpTestFunction>ffmpeg -i "Airdocs Background Video.mp4" tmpout3.mp4
ffmpeg version N-87196-g6cadbb1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 74.100 / 55. 74.100
libavcodec 57.105.100 / 57.105.100
libavformat 57. 81.100 / 57. 81.100
libavdevice 57. 8.100 / 57. 8.100
libavfilter 6.101.100 / 6.101.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Airdocs Background Video.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
creation_time : 2017-09-08T11:55:11.000000Z
Duration: 00:00:24.02, start: 0.000000, bitrate: 105 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 104 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : AVC Coding
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 00000000005fc5a0] using SAR=1/1
[libx264 @ 00000000005fc5a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 00000000005fc5a0] profile High, level 3.2
[libx264 @ 00000000005fc5a0] 264 - core 152 r2851 ba24899 - 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=1 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_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'tmpout3.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
encoder : Lavf57.81.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30.30 fps, 16k tbn, 30.30 tbc (default)
Metadata:
creation_time : 2017-09-08T11:55:11.000000Z
handler_name : VideoHandler
encoder : Lavc57.105.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 728 fps= 39 q=29.0 Lsize= 62kB time=00:00:23.92 bitrate= 21.1kbits/s speed=1.28x
video:52kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 17.915474%
[libx264 @ 00000000005fc5a0] frame I:4 Avg QP:12.46 size: 6102
[libx264 @ 00000000005fc5a0] frame P:184 Avg QP:16.94 size: 45
[libx264 @ 00000000005fc5a0] frame B:540 Avg QP:20.50 size: 37
[libx264 @ 00000000005fc5a0] consecutive B-frames: 1.1% 0.0% 0.0% 98.9%
[libx264 @ 00000000005fc5a0] mb I I16..4: 66.3% 30.4% 3.3%
[libx264 @ 00000000005fc5a0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%
[libx264 @ 00000000005fc5a0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:12.3% L1:87.7% BI: 0.0%
[libx264 @ 00000000005fc5a0] 8x8 transform intra:30.5% inter:14.3%
[libx264 @ 00000000005fc5a0] coded y,uvDC,uvAC intra: 2.3% 2.2% 2.1% inter: 0.0% 0.0% 0.0%
[libx264 @ 00000000005fc5a0] i16 v,h,dc,p: 93% 6% 2% 0%
[libx264 @ 00000000005fc5a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 41% 31% 0% 0% 0% 0% 0% 0%
[libx264 @ 00000000005fc5a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 17% 16% 5% 4% 5% 6% 3% 5%
[libx264 @ 00000000005fc5a0] i8c dc,h,v,p: 93% 6% 1% 0%
[libx264 @ 00000000005fc5a0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000000005fc5a0] ref B L1: 98.2% 1.8%
[libx264 @ 00000000005fc5a0] kb/s:17.57
D:\home\site\wwwroot\HttpTestFunction>
使用 -y 命令在 azure 上输出
2017-10-25T04:34:45.519 Compilation succeeded.
2017-10-25T04:34:46.160 Function started (Id=18880991-c93a-42a3-96b6-7df283e3bdb4)
2017-10-25T04:34:46.300 C# HTTP trigger function processed a request.
2017-10-25T04:34:46.300 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4" -y
2017-10-25T04:34:46.394 process started
2017-10-25T04:36:46 No new trace in the past 1 min(s).
2017-10-25T04:37:46 No new trace in the past 2 min(s).
2017-10-25T04:38:37.947 Function started (Id=c7f7f768-c53b-4074-a0c2-8391848bbd80)
2017-10-25T04:38:37.963 C# HTTP trigger function processed a request.
2017-10-25T04:38:37.963 ffmpeg argument is: -i "Airdocs Background Video.mp4" "tmpOut2.mp4" -y
2017-10-25T04:38:38.025 process started
2017-10-25T04:39:46 No new trace in the past 1 min(s).
2017-10-25T04:39:46.258 Function completed (Failure, Id=18880991-c93a-42a3-96b6-7df283e3bdb4, Duration=300079ms)
2017-10-25T04:39:46.321 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
File 'tmpOut2.mp4' already exists. Overwrite ? [y/N] Not overwriting - exiting
您可以在您的命令中添加 -y 选项来覆盖输出文件而无需询问，如下所示：
ffmpeg -i {input file path} {output file path} -y
更多选项，您可以参考here。
此外，您可以利用 kudu 来测试转换，如下所示：
2017-10-14T02:22:10.610 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.HttpTestFunction.
看来您使用的是动态 SKU。正如host.json提到的关于functionTimeout的内容如下：
Value indicating the timeout duration for all functions.
- In Dynamic SKUs, the valid range is from 1 second to 10 minutes and the default value is 5 minutes.
- In Paid SKUs there is no limit and the default value is null (indicating no timeout).
注意：如果对话会花费很多时间，您需要增加functionTimeout或更改SKU类型。此外，对于付费 SKU，您需要启用 Always On 功能，更多详情请参阅 here.
事实证明，整个问题是由
引起的string output = process.StandardOutput.ReadToEnd();
string err = process.StandardError.ReadToEnd();
ffmpeg 运行有很多 output/error 消息，这使缓冲区超载并导致整个事情挂起。解决方案是让这个过程逐个发生
process.OutputDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("O: "+e.Data);
}
);
process.ErrorDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("E: "+e.Data);
}
);
//start process
process.Start();
log.Info("process started");
process.BeginOutputReadLine();
process.BeginErrorReadLine();
process.WaitForExit();
使用它而不是 'ReadToEnd()' 解决了我所有的问题，它现在可以正常工作并且仍在捕获输出和错误行。