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• ffmpeg throw a silent video output when trying to merge video and audio

  31 janvier 2023, par porororo

  I tried to combine mp4 format video and wav format audio.
The video is shorter than the audio and start second is same as 00:00.

  


  I used command as bellows :

  


  ffmpeg -i video.mp4 -i audio.wav  -filter_complex "[0:a]volume=0.2[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y -shortest output_video.mp4


  


  The problem is the output_video.mp4 is a silent video without the sound.

  


  How can I get the output_video.mp4 with sound from audio.wav ?

  


  ffmpeg output is :

  


  

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
configuration: --prefix=/tmp/build/80754af9/ffmpeg_1587154242452/\_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeho --cc=/tmp/build/80754af9/ffmpeg_1587154242452/\_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-avresample --enable-gmp --enable-hardcoded-tables --enable-libfreetype --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame --disable-nonfree --enable-gpl --enable-gnutls --disable-openssl --enable-libopenh264 --enable-libx264
libavutil      56. 31.100 / 56. 31.100
libavcodec     58. 54.100 / 58. 54.100
libavformat    58. 29.100 / 58. 29.100
libavdevice    58.  8.100 / 58.  8.100
libavfilter     7. 57.100 /  7. 57.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  5.100 /  5.  5.100
libswresample   3.  5.100 /  3.  5.100
libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf58.29.100
Duration: 00:00:19.04, start: 0.000000, bitrate: 510 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 373 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name    : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name    : SoundHandler
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
Duration: 00:00:14.70, bitrate: 352 kb/s
Stream #1:0: Audio: pcm_s16le (\[1\]\[0\]\[0\]\[0\] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
Stream mapping:
Stream #0:1 (aac) -\> volume (graph 0)
Stream #1:0 (pcm_s16le) -\> amerge:in0 (graph 0)
Stream #0:0 -\> #0:0 (h264 (native) -\> h264 (libx264))
amerge (graph 0) -\> Stream #0:1 (aac)
Press \[q\] to stop, \[?\] for help
\[libx264 @ 0x55aa9a642ac0\] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
\[libx264 @ 0x55aa9a642ac0\] profile High, level 3.1, 4:2:0, 8-bit
\[libx264 @ 0x55aa9a642ac0\] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=22 lookahead_threads=3 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
\[Parsed_amerge_1 @ 0x55aa9b37c140\] No channel layout for input 1
Output #0, mp4, to 'output_video.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name    : VideoHandler
encoder         : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, 3.0, fltp, 197 kb/s (default)
Metadata:
encoder         : Lavc58.54.100 aac
frame=  507 fps=291 q=-1.0 Lsize=    1116kB time=00:00:16.80 bitrate= 544.3kbits/s speed=9.64x  
video:760kB audio:342kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.242977%
\[libx264 @ 0x55aa9a642ac0\] frame I:3     Avg QP:16.24  size: 19770
\[libx264 @ 0x55aa9a642ac0\] frame P:154   Avg QP:20.29  size:  3227
\[libx264 @ 0x55aa9a642ac0\] frame B:350   Avg QP:19.84  size:   633
\[libx264 @ 0x55aa9a642ac0\] consecutive B-frames:  0.6% 15.8% 18.9% 64.7%
\[libx264 @ 0x55aa9a642ac0\] mb I  I16..4: 23.5% 67.4%  9.1%
\[libx264 @ 0x55aa9a642ac0\] mb P  I16..4:  0.7%  3.0%  0.3%  P16..4: 13.0%  3.1%  1.0%  0.0%  0.0%    skip:78.8%
\[libx264 @ 0x55aa9a642ac0\] mb B  I16..4:  0.2%  0.1%  0.0%  B16..8: 10.4%  0.3%  0.0%  direct: 0.6%  skip:88.3%  L0:41.5% L1:57.2% BI: 1.3%
\[libx264 @ 0x55aa9a642ac0\] 8x8 transform intra:68.2% inter:81.9%
\[libx264 @ 0x55aa9a642ac0\] coded y,uvDC,uvAC intra: 24.6% 22.9% 6.1% inter: 1.2% 1.7% 0.0%
\[libx264 @ 0x55aa9a642ac0\] i16 v,h,dc,p: 68% 16%  6% 10%
\[libx264 @ 0x55aa9a642ac0\] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 10% 50%  2%  2%  3%  2%  4%  3%
\[libx264 @ 0x55aa9a642ac0\] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 25% 13%  5%  5%  6%  5%  6%  4%
\[libx264 @ 0x55aa9a642ac0\] i8c dc,h,v,p: 75% 10% 12%  2%
\[libx264 @ 0x55aa9a642ac0\] Weighted P-Frames: Y:0.0% UV:0.0%
\[libx264 @ 0x55aa9a642ac0\] ref P L0: 65.9% 16.2% 13.5%  4.4%
\[libx264 @ 0x55aa9a642ac0\] ref B L0: 84.1% 13.4%  2.5%
\[libx264 @ 0x55aa9a642ac0\] ref B L1: 97.1%  2.9%
\[libx264 @ 0x55aa9a642ac0\] kb/s:368.24
\[aac @ 0x55aa9a62a280\] Qavg: 8290.713


  


  


  


• How to make ffmpeg to throw exception on try/catch for working directory and for arguments ?

  30 juin 2022, par Sharo SA

  If for example i'm setting the FileName(outputDirectory) to null it will throw exception.

  


  The class when i'm using process of the ffmpeg.exe :

  


  public void Start()
        {
            process = new Process();
            process.StartInfo.FileName = outputDirectory; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = workingDirectory; // The output directory  
            process.StartInfo.Arguments = arguments;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardInput = true; //Redirect stdin
            process.StartInfo.CreateNoWindow = true;
            process.Start();

            errorMessage = false;
            startRecord = true;
        }


  


  but if i'm setting the WorkingDirectory to null or entering some not valid Arguments like "sadasdasd" it will not throw exception not on the WorkingDirectory and not on the Arguments.

  


  In Form1 :

  


  private void recordStripMenuItem_Click(object sender, EventArgs e)
        {
            recordToggle = !recordToggle;

            if (recordToggle)
            {
                try
                {
                    record.workingDirectory = settingsForm.workingDirectory;
                    record.outputDirectory = settingsForm.outputDirectory;
                    record.arguments = settingsForm.arguments;
                    record.Start();
                }
                catch(Exception ex)
                {
                    recordStripMenuItem.Text = "Record";
                    Icon = iconGreen;
                    TextInfo("Waiting");
                    recordToggle = false;
                    MessageBox.Show("Arguments are not valid : " + ex.Message);
                    
                }
                if (!FFmpeg_Capture.errorMessage)
                {
                    settingsForm.Close();
                    recordStripMenuItem.Text = "Stop";
                    Icon = iconRed;
                    TextInfo("Recording");
                }
            }
            else
            {
                recordStripMenuItem.Text = "Record";
                Icon = iconGreen;
                TextInfo("Waiting");
                record.Stop();
            }
        }


  


  The variable record is instance of the FFmpeg_Capture class with the process of the ffmpeg.
It's throwing exception only on the FileName(outputDirectory).

  


• fileapi::WriteFile() doesn't send an input, if processthreadsapi::STARTUPINFO::hStdError is set (ffmpeg)

  23 avril 2021, par Lidekys

  I'm trying to capture my screen using ffmpeg in a different thread (which I create using processthreadsapi::CreateProcess()) so I'd be able to do something else in the main thread, and redirect ffmpeg output, so it wouldn't pop up in the console for the user to see. To stop filming, I send a 'q' input using WriteFile(), and after that I want to save ffmpeg accumulated output using ReadFile().

  


  However, if I set STARTUPINFO::hStdError (note, that ffmpeg output goes to stderr) to a pipe, from which I could read the accumulated data, the inputs I send using WriteFile() are no longer registered and ffmpeg.exe keeps running.

  


  I've tried redirecting ffmpeg output in a simple command line, but I can still stop the process by pressing the q button.

  


  Also, if I record for less than 8 seconds, the input is registered and ffmpeg.exe closes.

  


  Is there something wrong with my code, or is it processthreadsapi issue, any hints will be kindly appreciared !

  


  Here's a minimal code of how I am trying to do it :

  


  &#xA;#include <iostream>&#xA;&#xA;#include &#xA;#include &#xA;&#xA;using namespace std;&#xA;&#xA;HANDLE g_hChildStd_IN_Rd = NULL;&#xA;HANDLE g_hChildStd_IN_Wr = NULL;&#xA;HANDLE g_hChildStd_OUT_Rd = NULL;&#xA;HANDLE g_hChildStd_OUT_Wr = NULL;&#xA;&#xA;int main()&#xA;{&#xA;    //Create IN and OUT pipes&#xA;    SECURITY_ATTRIBUTES saAttr;&#xA;    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);&#xA;    saAttr.lpSecurityDescriptor = NULL;&#xA;&#xA;&#xA;    if (! CreatePipe(&amp;g_hChildStd_OUT_Rd, &amp;g_hChildStd_OUT_Wr, &amp;saAttr, 0) )&#xA;        cout&lt;&lt;"StdoutRd CreatePipe error"&lt;/Start recording&#xA;   if(!CreateProcess(NULL,&#xA;      "ffmpeg -y -f gdigrab -framerate 2 -i desktop record.avi",     // command line&#xA;      NULL,          // process security attributes&#xA;      NULL,          // primary thread security attributes&#xA;      TRUE,          // handles are inherited&#xA;      0,             // creation flags&#xA;      NULL,          // use parent&#x27;s environment&#xA;      NULL,          // use parent&#x27;s current directory&#xA;      &amp;siStartInfo,  // STARTUPINFO pointer&#xA;      &amp;piProcInfo))  // receives PROCESS_INFORMATION&#xA;   {&#xA;    cout&lt;&lt;"Error create process"&lt;/Record for a while&#xA;    while(getch() != &#x27;k&#x27;){&#xA;        cout&lt;&lt;"While press k"&lt;/Stop recording by emulating a Q button push&#xA;    DWORD dwWritten;&#xA;    CHAR chBufW[1] = {&#x27;q&#x27;};&#xA;&#xA;    if ( ! WriteFile(g_hChildStd_IN_Wr, chBufW, 1, &amp;dwWritten, NULL) )&#xA;        cout&lt;&lt;"Error write file"&lt;/Save stdError (ffmpeg) data&#xA;    DWORD dwRead;&#xA;    char stdErrorData[4096];&#xA;    bool bSuccess;&#xA;&#xA;    bSuccess = ReadFile( g_hChildStd_OUT_Wr, stdErrorData, 4096, &amp;dwRead, NULL);&#xA;&#xA;    if(!bSuccess || dwRead == 0)&#xA;        cout&lt;&lt;"Read failed"&lt;code></iostream>