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• The system cannot find the file specified error when trying to execute FFMpeg command with C# (same code works fine in a different app)

  5 mars 2023, par m_kr

  I know there are similar questions to this one. I have gone through every single one I could find and nothing worked for me. Here is my issue :

  


  I am trying to execute a FFMpeg command in command-line through .NET.

  


  Before anything I tried doing it with the following code :

  


  public static string executeCommand(string commandToBeExecuted)
    {
        Process cmd = new Process();
        cmd.StartInfo.FileName = "cmd.exe";
        cmd.StartInfo.RedirectStandardInput = true;
        cmd.StartInfo.RedirectStandardOutput = true;
        cmd.StartInfo.CreateNoWindow = true;
        cmd.StartInfo.UseShellExecute = false;
        cmd.Start();

        cmd.StandardInput.WriteLine(commandToBeExecuted);
        cmd.StandardInput.Flush();
        cmd.StandardInput.Close();
        cmd.WaitForExit();
        return cmd.StandardOutput.ReadToEnd();
    }


  


  Sending the "ffmpeg -h" command in commandToBeExecuted. This did not work.

  


  I next tried the following solution :

  


  public static string ffmpegCommand(string commandToBeExecuted)
    {
        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";
        startInfo.WindowStyle = ProcessWindowStyle.Hidden;
        startInfo.Arguments = "-h";

        startInfo.RedirectStandardOutput = true;
        startInfo.RedirectStandardError = true;


        Process exeProcess = Process.Start(startInfo);

        // string error = exeProcess.StandardError.ReadToEnd();
        string output = exeProcess.StandardOutput.ReadToEnd();
        exeProcess.WaitForExit();
        return output;
    }


  


  This returns the following error :

  


  


  The system cannot find the file specified

  


  


  I am assuming this is referring to this part of the code :

  


  startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";


  


  However, I checked and this is the correct path to my ffmpeg.exe file. On an even weirder note, this code works correct when tested in a new .net console application. However, I am creating an extension for OutSystems in integration, and when testing this code there it no longer works. The long exception from the logs is the following :

  


  


  CssbobffmpegCommandTestFolder
System.ComponentModel.Win32Exception : The system cannot find the file specified
at Object.s [as getException] (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:2:10241)
at c.onSuccess (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:7232)
at XMLHttpRequest. (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:2648)

  


  


  I researched similar problems and tried the following solutions :

  


  In place of :

  


  startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";


  


  I tried :

  


    startInfo.WorkingDirectory = "c:\\ffmpeg\\bin";
  startInfo.FileName = @"ffmpeg.exe";


  


  I also tried changing the :

  


  startInfo.Arguments = "-h";


  


  to :

  


  startInfo.Arguments = "/C -h";


  


  I tried to "add new item" to my solution : the ffmpeg.exe file, and I tried the following logic :

  


  public static string testingNewApproachTwoThree(string commandToBeExecuted)
    {
        string res;
        ProcessStartInfo startInfo = new ProcessStartInfo();

        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ffmpeg\\ffmpeg.exe");
        startInfo.Arguments = "-h";
        startInfo.RedirectStandardOutput = true;
        //startInfo.RedirectStandardError = true;

        res = string.Format(
            "Executing \"{0}\" with arguments \"{1}\".\r\n",
            startInfo.FileName,
            startInfo.Arguments) + " NEXT: ";

        try
        {
            using (Process process = Process.Start(startInfo))
            {
                while (!process.StandardOutput.EndOfStream)
                {
                    res = res + process.StandardOutput.ReadLine();

                }

                process.WaitForExit();
            }
        }
        catch (Exception ex)
        {
            res = res + "exception:" + ex.Message;
        }

        return res;
    }


  


  as suggested in a different question.

  


  I tried changing the capitalization of letters in the specified filepath to make sure it matches the naming of my folders. Nothing worked.

  


  Any ideas ?

  


• Getting a lot of Tail Silence when combining an image and audio into mp4 movie

  1er avril 2023, par Meryan

  As it can be seen from this snapshot the audio HELLO.mp3 combined with bitmap HELLO.jpg produced a movie HELLO_aac.mp4 that has a huge amount of tail silence

  


  

  


  The command line I was helped to put together is the following

  


  ======================== 
IN_FILES=-i ".\HELLO.JPG" -i ".\HELLO.MP3"    
OUT_FILE=".\HELLO_aac.MP4"   
EXE="S:\_BINS\FFmpeg 4.2.1 20200112\bin\ffmpeg.exe"  
OPTIONS= -loop 1   -i ".\HELLO.JPG" -i ".\HELLO.MP3"    -vf "scale=-1:1080,pad=1920:1080:(1920-iw)/2:(1080-ih)/2,setsar=1"  -c:v libx264 -profile:v main -pix_fmt yuv420p -r 24 -video_track_timescale 24000    -c:a aac    -shortest -y ".\HELLO_aac.MP4"     
======================== 



  


  Here is the captured output from FFmpeg

  


  ffmpeg version git-2020-01-10-3d894db Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20191125
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 38.100 / 56. 38.100
  libavcodec     58. 65.103 / 58. 65.103
  libavformat    58. 35.101 / 58. 35.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 70.101 /  7. 70.101
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, image2, from '.\HELLO.JPG':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 23923 kb/s
    Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1600x1200 [SAR 120:120 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc
[mp3 @ 000002019015d4c0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from '.\HELLO.MP3':
  Metadata:
    genre           : Blues
    id3v2_priv.XMP  : <?xpacket begin="\xef\xbb\xbf" id="W5M0MpCehiHzreSzNTczkc9d"?>\x0a\x0a \x0a  s
    Stream #1:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Press [q] to stop, [?] for help
[swscaler @ 0000020190b10380] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0000020190b10380] Warning: data is not aligned! This can lead to a speed loss
[libx264 @ 0000020190759300] using SAR=1/1
[libx264 @ 0000020190759300] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000020190759300] profile Main, level 4.0, 4:2:0, 8-bit
[libx264 @ 0000020190759300] 264 - core 158 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=34 lookahead_threads=5 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=24 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 '.\HELLO_aac.MP4':
  Metadata:
    encoder         : Lavf58.35.101
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 24k tbn, 24 tbc
    Metadata:
      encoder         : Lavc58.65.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 24000 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc58.65.103 aac
frame=   69 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=1 speed=   0x    
frame=   97 fps=0.0 q=-1.0 Lsize=     128kB time=00:00:03.91 bitrate= 267.1kbits/s dup=0 drop=2 speed=5.04x    
video:119kB audio:6kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.208101%
[libx264 @ 0000020190759300] frame I:1     Avg QP:12.88  size:103994
[libx264 @ 0000020190759300] frame P:24    Avg QP:14.05  size:   224
[libx264 @ 0000020190759300] frame B:72    Avg QP:12.67  size:   160
[libx264 @ 0000020190759300] consecutive B-frames:  1.0%  0.0%  0.0% 99.0%
[libx264 @ 0000020190759300] mb I  I16..4: 61.7%  0.0% 38.3%
[libx264 @ 0000020190759300] mb P  I16..4:  0.1%  0.0%  0.0%  P16..4:  0.5%  0.1%  0.0%  0.0%  0.0%    skip:99.3%
[libx264 @ 0000020190759300] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.6%  0.0%  0.0%  direct: 0.0%  skip:98.4%  L0:81.1% L1:18.9% BI: 0.0%
[libx264 @ 0000020190759300] coded y,uvDC,uvAC intra: 34.5% 17.3% 15.6% inter: 0.0% 0.1% 0.0%
[libx264 @ 0000020190759300] i16 v,h,dc,p: 70% 19%  7%  3%
[libx264 @ 0000020190759300] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 22% 12%  4%  5%  5%  3%  5%  4%
[libx264 @ 0000020190759300] i8c dc,h,v,p: 80%  8% 10%  2%
[libx264 @ 0000020190759300] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000020190759300] ref P L0: 97.6%  0.3%  1.5%  0.6%
[libx264 @ 0000020190759300] ref B L0:  1.8% 98.2%
[libx264 @ 0000020190759300] ref B L1: 99.9%  0.1%
[libx264 @ 0000020190759300] kb/s:239.28
[aac @ 000002019075bf40] Qavg: 8004.814
======================== 


  


  I have also tried the following command line

  


  "S:\_BINS\ffmpeg-2023-03-20\bin\ffmpeg.exe" -loop 1 -i "HELLO.JPG" -i "HELLO.MP3" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -y -shortest "HELLO_aac.mp4"    


  


  With similar long dead tail silence ???

  


• How to handle errors during downloading (using videomanifest) video and make it more robust

  5 mai 2023, par Wakan Tanka

  I'm using ffmpeg to download videos from streaming site following way :

  


  ffmpeg.exe -i videomanifest -codec copy video.mp4 


  


  This works, but it has some drawbacks. The problem is that sometimes my (or maybe error on server side etc.) internet connection fails, and I'm forced to restart the whole download again. I would like to make this process more robust. It would be great if ffmpeg can continuously split video to several smaller files during the download and if download will fail then ffmpeg will continue (or maybe skip) from broken part. After downloading all parts I will concat them manually, this is no problem. Please treat above text just like an example, any other solution which will make downloading process more robust is welcomed. Is this possible with ffmpeg ?

  


  Here is example of videomanifest (this is not a fully functional file, important url parts were deleted due to privacy, so please treat it as an example for demonstration purposes)

  


  <mpd type="static" maxsegmentduration="PT5.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011" mediapresentationduration="PT0H0M4961.472S" minbuffertime="PT4.500S" xmlns="urn:mpeg:DASH:schema:MPD:2011">&#xA;  <baseurl>https://........................</baseurl>&#xA;  <period>&#xA;    <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <label>EnhancedAudio</label>&#xA;      <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;amp;docId=https%3a%2...................">&#xA;        <segmenttimeline>&#xA;          <s d="221184" r="988"></s>&#xA;          <s d="49939"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>&#xA;      <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>&#xA;    </adaptationset>&#xA;    <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <label>OriginalAudio</label>&#xA;      <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;amp;docId=https%3a%2f%2fstu">&#xA;        <segmenttimeline>&#xA;          <s d="221184" r="988"></s>&#xA;          <s d="49939"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>&#xA;      <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>&#xA;    </adaptationset>&#xA;    <adaptationset contenttype="video" mimetype="video/mp4" segmentalignment="true" bitstreamswitching="true" maxframerate="82690000/5512747" maxwidth="1920" maxheight="1080" codecs="avc1.4d0028">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <segmenttemplate timescale="15000" initialization="videotranscode?provider=Spo&amp;amp;docId=https............">&#xA;        <segmenttimeline>&#xA;          <s d="74999" r="991"></s>&#xA;          <s d="22080"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation width="426" height="240" framerate="82690000/5512747" bandwidth="144000" codecs="avc1.4d401e"></representation>&#xA;      <representation width="852" height="480" framerate="82690000/5512747" bandwidth="480000" codecs="avc1.4d001f"></representation>&#xA;      <representation width="1280" height="720" framerate="82690000/5512747" bandwidth="1081600" codecs="avc1.4d001f"></representation>&#xA;      <representation width="1920" height="1080" framerate="82690000/5512747" bandwidth="2428800" codecs="avc1.4d0028"></representation>&#xA;    </adaptationset>&#xA;  </period>&#xA;</mpd>&#xA;