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  • Proccess audio/video stream with opencv and export to audio/video stream

    13 juin 2016, par user3373406

    I need read a stream of audio/video and process the video with openCV.Then export the same stream with the video processed. All this need to be in real time. Of course you will have a delay for the processing with openCV. Thank.

  • How to apply a patch to ffmpeg version 3.0.2

    13 juin 2016, par user3362668

    I have this patch for ffmpeg to fix audio channel output: https://gist.github.com/outlyer/4a88f1adb7f895b93fd9, I cannot seem to find how to recompile or apply this to ffmpeg? Curious if anyone out there has worked with this and successfully enabled it.

    Thank you!

  • FFMPEG How to merge several videos to one file with fade effect and add audio ?

    13 juin 2016, par user2455079

    Need to merge several videos to one and add sound track mp3 file and last video with sound.

    Only found this solution: http://superuser.com/questions/778762/crossfade-between-2-videos-using-ffmpeg But uses static file length in parameters...

    Ok, i can calculate all lengths before and add audio:

    ffmpeg -i music.mp3 -i 1.mov -i 2.mov -f lavfi -i color=black:s=1280x720 -filter_complex "[1:v]format=pix_fmts=yuva420p,fade=t=out:st=4:d=1:alpha=1,setpts=PTS-STARTPTS[va1]; [2:v]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+4/TB[va2]; [3:v]scale=1280x720,trim=duration=9[over]; [over][va1]overlay[over1]; [over1][va2]overlay=format=yuv420[outv]" -vcodec libx264 -map 0:a -map [outv] -shortest out.mp4

    How to merge more than two videos?? And how to add another end.avi which contains sound and mute music.mp3 ?

  • Video lagging while doing screen capture using ffmpeg

    13 juin 2016, par somya bhargava

    Did 30 fps and also tried options like -crf 0 and -qp 0 still the output video lags It might be due to low CPU available

    Is there any option from which i can get a smooth video

  • Why when converting avi video file to another format the first 2-3 seconds are blurry ?

    13 juin 2016, par Sharon Gabriel

    The source file is avi. The target new file is mp4. The first 2-3 seconds are blurry. Then after 2-3 second the whole video until the end is smooth and sharp.

    Another sub question is how come that 2.16 GB avi file after conversion using ffmpeg is only 1.34 MB ? It's not part of a movie or something it's collection of screenshots images i did in c# and then used AviFile Lib to create from them a avi video file. and yet from 2.16 GB to 1.34 MB and it keep the quality i think almost the same quality like the original avi file and the same duration 2:20 minutes.

    About the blurry problem this is my code where i set the ffmpeg arguments and set the process:

    private void Convert()
        {
            try
            {
                Control.CheckForIllegalCrossThreadCalls = false;
                if (ComboBox1.SelectedIndex == 3) 
                {
                    strFFCMD = " -i " + (char)34 + InputFile + (char)34 + " -c:v libx264 -s 1920x1080 -pix_fmt yuv420p -qp 18 -profile high444 -c:a libvo_aacenc -b:a 128k -ar 44100 -ac 2 -y " + OutputFile;
                }    
                psiProcInfo.FileName = exepath;
                psiProcInfo.Arguments = strFFCMD;        
                psiProcInfo.UseShellExecute = false;      
                psiProcInfo.WindowStyle = ProcessWindowStyle.Hidden;    
                psiProcInfo.RedirectStandardError = true;             
                psiProcInfo.RedirectStandardOutput = true;         
                psiProcInfo.CreateNoWindow = true;                 
                prcFFMPEG.StartInfo = psiProcInfo;           
                prcFFMPEG.Start();
                ffReader = prcFFMPEG.StandardError;

                do
                {
                    if (Bgw1.CancellationPending)
                    {
                        return;
                    }
                    Button5.Enabled = true;
                    Button3.Enabled = false;
                    strFFOUT = ffReader.ReadLine();                    
                    RichTextBox1.Text = strFFOUT;
                    if (strFFOUT != null)
                    {
                        if (strFFOUT.Contains("frame="))
                        {
                            currentFramestr = strFFOUT.Substring(7, 6).Trim();
                            Regex rx = new Regex(@"^\d+");
                            Match m = rx.Match(currentFramestr);
                            if (m.Success)
                            {
                                currentFrameInt = System.Convert.ToInt32(m.Value);
                            }
                        }
                    }
                    string percentage = ((double)ProgressBar1.Value / (double)ProgressBar1.Maximum * 100.0).ToString();
                    textBox3.Text = ProgressBar1.Value.ToString();                    
                    ProgressBar1.Maximum = FCount + 1;
                    ProgressBar1.Value = (currentFrameInt);
                    Label12.Text = "Current Encoded Frame: " + currentFrameInt;
                    Label11.Text = percentage;
                } while (!(prcFFMPEG.HasExited || string.IsNullOrEmpty(strFFOUT)));
            }
            catch(Exception err)
            {
                string errors = err.ToString();
            }
        }

    psiProcInfo is ProcessStartInfo

    prcFFMPEG is Process

    And this is how it looks like when i play the target the new created converted video file the mp4 the first seconds:

    Duration: 00:02:20

    Width: 1920 Height: 1080

    Data Rate and Total Rate both: 80kbps

    Frame rate: 2 frames/second

    Blurry

    This is the output of the ffmpeg console while converting the file.

      ffmpeg version 2.8.git Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 5.2.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 11.100 / 55. 11.100
  libavcodec     57. 17.100 / 57. 17.100
  libavformat    57. 20.100 / 57. 20.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 21.100 /  6. 21.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[avi @ 00000147a882b660] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, avi, from 'C:\temp\video\new.avi':
  Duration: 00:02:20.50, start: 0.000000, bitrate: 132710 kb/s
    Stream #0:0: Video: rawvideo, bgra, 1920x1080, 2 fps, 2 tbr, 2 tbn, 2 tbc
Please use -profile:a or -profile:v, -profile is ambiguous
Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (C:\temp\video\5.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[libx264 @ 00000147a882c820] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 00000147a882c820] profile High, level 4.0
[libx264 @ 00000147a882c820] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=12 lookahead_threads=2 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=2 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=18 ip_ratio=1.40 pb_ratio=1.30 aq=0
Output #0, mp4, to 'C:\temp\video\5.mp4':
  Metadata:
    encoder         : Lavf57.20.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 2 fps, 16384 tbn, 2 tbc
    Metadata:
      encoder         : Lavc57.17.100 libx264
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame=    8 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   15 fps= 14 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   21 fps= 13 q=18.0 size=      92kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   30 fps= 14 q=18.0 size=     141kB time=00:00:04.50 bitrate= 257.3kbits/s speed=2.03x    
frame=   37 fps= 13 q=20.0 size=     164kB time=00:00:08.00 bitrate= 167.6kbits/s speed=2.82x    
frame=   46 fps= 14 q=18.0 size=     185kB time=00:00:12.50 bitrate= 121.0kbits/s speed= 3.7x    
frame=   51 fps= 13 q=19.0 size=     194kB time=00:00:15.00 bitrate= 106.1kbits/s speed=3.87x    
frame=   58 fps= 13 q=18.0 size=     210kB time=00:00:18.50 bitrate=  93.2kbits/s speed=4.19x    
frame=   65 fps= 13 q=20.0 size=     224kB time=00:00:22.00 bitrate=  83.6kbits/s speed=4.46x    
frame=   71 fps= 13 q=19.0 size=     238kB time=00:00:25.00 bitrate=  78.1kbits/s speed=4.56x    
frame=   78 fps= 13 q=18.0 size=     253kB time=00:00:28.50 bitrate=  72.6kbits/s speed=4.75x    
frame=   83 fps= 13 q=19.0 size=     265kB time=00:00:31.00 bitrate=  70.0kbits/s speed= 4.7x    
frame=   89 fps= 12 q=20.0 size=     280kB time=00:00:34.00 bitrate=  67.4kbits/s speed=4.73x    
frame=   95 fps= 12 q=19.0 size=     291kB time=00:00:37.00 bitrate=  64.5kbits/s speed=4.73x    
frame=  102 fps= 12 q=18.0 size=     308kB time=00:00:40.50 bitrate=  62.3kbits/s speed=4.84x    
frame=  107 fps= 12 q=19.0 size=     317kB time=00:00:43.00 bitrate=  60.4kbits/s speed=4.82x    
frame=  115 fps= 12 q=19.0 size=     336kB time=00:00:47.00 bitrate=  58.6kbits/s speed=4.96x    
frame=  123 fps= 12 q=20.0 size=     354kB time=00:00:51.00 bitrate=  56.8kbits/s speed=5.09x    
frame=  132 fps= 12 q=20.0 size=     371kB time=00:00:55.50 bitrate=  54.8kbits/s speed=5.25x    
frame=  139 fps= 13 q=20.0 size=     392kB time=00:00:59.00 bitrate=  54.5kbits/s speed=5.32x    
frame=  146 fps= 13 q=19.0 size=     408kB time=00:01:02.50 bitrate=  53.5kbits/s speed=5.37x    
frame=  150 fps= 12 q=20.0 size=     417kB time=00:01:04.50 bitrate=  52.9kbits/s speed=5.28x    
frame=  155 fps= 12 q=18.0 size=     428kB time=00:01:07.00 bitrate=  52.4kbits/s speed=5.25x    
frame=  161 fps= 12 q=20.0 size=     441kB time=00:01:10.00 bitrate=  51.6kbits/s speed=5.26x    
frame=  167 fps= 12 q=19.0 size=     462kB time=00:01:13.00 bitrate=  51.9kbits/s speed=5.29x    
frame=  174 fps= 12 q=20.0 size=     483kB time=00:01:16.50 bitrate=  51.7kbits/s speed=5.33x    
frame=  181 fps= 12 q=18.0 size=     614kB time=00:01:20.00 bitrate=  62.8kbits/s speed=5.36x    
frame=  187 fps= 12 q=20.0 size=     763kB time=00:01:23.00 bitrate=  75.3kbits/s speed=5.35x    
frame=  193 fps= 12 q=19.0 size=     852kB time=00:01:26.00 bitrate=  81.2kbits/s speed=5.36x    
frame=  199 fps= 12 q=18.0 size=     865kB time=00:01:29.00 bitrate=  79.6kbits/s speed=5.37x    
frame=  206 fps= 12 q=20.0 size=     932kB time=00:01:32.50 bitrate=  82.6kbits/s speed=5.39x    
frame=  211 fps= 12 q=20.0 size=     943kB time=00:01:35.00 bitrate=  81.3kbits/s speed=5.38x    
frame=  217 fps= 12 q=18.0 size=    1007kB time=00:01:38.00 bitrate=  84.1kbits/s speed=5.38x    
frame=  223 fps= 12 q=20.0 size=    1175kB time=00:01:41.00 bitrate=  95.3kbits/s speed=5.38x    
frame=  230 fps= 12 q=20.0 size=    1195kB time=00:01:44.50 bitrate=  93.7kbits/s speed=5.42x    
frame=  235 fps= 12 q=18.0 size=    1205kB time=00:01:47.00 bitrate=  92.3kbits/s speed= 5.4x    
frame=  241 fps= 12 q=20.0 size=    1222kB time=00:01:50.00 bitrate=  91.0kbits/s speed= 5.4x    
frame=  247 fps= 12 q=19.0 size=    1232kB time=00:01:53.00 bitrate=  89.3kbits/s speed=5.39x    
frame=  255 fps= 12 q=19.0 size=    1252kB time=00:01:57.00 bitrate=  87.7kbits/s speed=5.45x    
frame=  260 fps= 12 q=20.0 size=    1274kB time=00:01:59.50 bitrate=  87.3kbits/s speed=5.44x    
frame=  267 fps= 12 q=20.0 size=    1287kB time=00:02:03.00 bitrate=  85.7kbits/s speed=5.45x    
frame=  272 fps= 12 q=18.0 size=    1304kB time=00:02:05.50 bitrate=  85.1kbits/s speed=5.43x    
frame=  278 fps= 12 q=20.0 size=    1314kB time=00:02:08.50 bitrate=  83.8kbits/s speed=5.41x    
frame=  281 fps= 12 q=-1.0 Lsize=    1376kB time=00:02:19.50 bitrate=  80.8kbits/s speed=5.76x    
video:1372kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.299861%
[libx264 @ 00000147a882c820] frame I:2     Avg QP:15.00  size: 98930
[libx264 @ 00000147a882c820] frame P:80    Avg QP:18.00  size:  7068

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