Azure上的FFmpeg函数调用运行缓慢并产生一个空输出文件

问题描述：

我试图做一个使用ffmpeg的函数，到目前为止我还没有能够获得除-version命令以外的其他任何东西以正常工作。当我尝试运行一个简单的ffmpeg -i {input file path} {output file path}命令时，该功能似乎陷入了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“文件已存在”。我已经尝试在64位ffmpeg.exe和32位ffmpeg.exe之间切换，该函数同时以32位和64位函数的形式运行。我的代码和试图运行代码的相关日志包含在下面，如果任何人都可以告诉我我做错了什么或如何让进程工作，将不胜感激。在此先感谢，CuanAzure上的FFmpeg函数调用运行缓慢并产生一个空输出文件

编辑：该进程在kudu上运行相同的文件，输出显示在底部。在kudu上，进程在半分钟内运行，显然有些东西会导致函数进程挂起，如果有人有任何建议，将不胜感激。再次感谢Cuan。

第二次编辑：我试着将-y添加到我的命令结尾，这样做的作用是不再抱怨覆盖，但是由于超时，它现在只是挂起两次。（输出在底部）

编辑第三种：azure有一种方法可以让你在本地运行函数，但我的函数在本地版本上遇到了相同的问题，但是：事实证明，实际处理是在几个秒，只需要永久决定写入文件 - 如果在进程运行约10秒后手动终止进程，则立即写入文件。再次，任何帮助表示赞赏。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.

捻代码（只是直接运行的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>

输出在-y命令的天蓝色上

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.

分享不抱怨覆盖的执行日志。 – Mulvya

答

事实证明，整个问题由

string output = process.StandardOutput.ReadToEnd(); 
string err = process.StandardError.ReadToEnd();

ffmpeg的运行造成了大量输出/错误信息，这是超载的缓冲区，造成整个事情只是挂。解决的办法是让使用这个，而不是“ReadToEnd的（）”解决了我所有的问题，现在工作是否正常，输出和错误线仍然被捕获的事件

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();

这个过程中发生的事件。

答

文件 'tmpOut2.mp4' 已经存在。覆盖？ [Y/N]不覆盖 - 退出

你可以与你的命令重写输出文件如下添加-y选项，而不问：

ffmpeg -i {input file path} {output file path} -y

对于更多的选择，你可以参考here。

此外，可以利用kudu测试转换如下：

2017-10-14T02：22：10.610 Microsoft.Azure.WebJobs.Host：00的超时值： 05:00被函数：Functions.HttpTestFunction超出。

看来您使用的是动态的SKU。

值指示用于所有功能的超时持续时间：作为host.json如下提及functionTimeout。

在动态的SKU，有效范围是从1秒至10分钟，并默认值为5分钟。

付费SKU中没有限制，默认值为空（表示没有超时）。

注：如果谈话会花费大量的时间，你需要增加functionTimeout或改变的SKU类型。此外，对于付费SKU，您需要启用始终开启功能，更多详细信息可参考here。

Azure上的FFmpeg函数调用运行缓慢并产生一个空输出文件

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