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• When generating a video from images and adding audio the video isn't playable

  1er août 2017, par randommman

  So I have a bunch of images in a folder, with the following structure :

  image-0.png
  
  image-1.png
  
  image-2.png

  Sometimes the folder can have just 1 image which will be saved as :

  image-0.png

  My code to generate the video and to add the audio

  // create the file
  
  using (WaveFileReader wf = new WaveFileReader(Audio))
  
  {
  
      // the files
  
      OldVideo = "old.avi";
  
      NewVideo = "video.avi";
  
      Audio = "sound.wav";
  
  
  
      // Get the time of the audio and divide by images
  
      time = wf.TotalTime.TotalSeconds;
  
      mimtime = time / imagescount;
  
  
  
      ffmpegPath = "ffmpeg.exe";
  
      ffmpegParams = " -r 1/" + mimtime + " -i " + ImagesFolder + "image-%d.png -t " + time + " -y -vf scale=1280:-2 " + OldVideo;
  
      ffmaudioParams = " -i " + OldVideo + " -i " + Audio + " -c copy -shortest " + NewVideo;
  
  }
  
  
  
  
  
  using (Process ffmpeg = new Process())
  
  {
  
      //Generate video
  
      ffmpegstartInfo = new ProcessStartInfo();
  
      ffmpegstartInfo.FileName = ffmpegPath;
  
      ffmpegstartInfo.Arguments = ffmpegParams;
  
      ffmpegstartInfo.RedirectStandardOutput = true;
  
      ffmpegstartInfo.RedirectStandardError = true;
  
      ffmpegstartInfo.UseShellExecute = false;
  
      ffmpegstartInfo.CreateNoWindow = true;
  
  
  
      ffmpeg.StartInfo.FileName = ffmpegPath;
  
      ffmpeg.StartInfo.Arguments = ffmpegParams;
  
      ffmpeg.StartInfo = ffmpegstartInfo;
  
      ffmpeg.Start();
  
      ffmpeg.WaitForExit(30000);
  
  
  
  
  
      /*ffmpeg.StartInfo.FileName = "cmd.exe";
  
      ffmpeg.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmpegParams;
  
      ffmpeg.Start();
  
      ffmpeg.WaitForExit(30000);*/
  
  }
  
  
  
  using (Process ffmaudio = new Process())
  
  {
  
      //Add audio to video
  
      ffmaudiostartInfo = new ProcessStartInfo();
  
      ffmaudiostartInfo.FileName = ffmpegPath;
  
      ffmaudiostartInfo.Arguments = ffmaudioParams;
  
      ffmaudiostartInfo.RedirectStandardOutput = true;
  
      ffmaudiostartInfo.RedirectStandardError = true;
  
      ffmaudiostartInfo.UseShellExecute = false;
  
      ffmaudiostartInfo.CreateNoWindow = true;
  
  
  
      ffmaudio.StartInfo.FileName = ffmpegPath;
  
      ffmaudio.StartInfo.Arguments = ffmaudioParams;
  
      ffmaudio.StartInfo = ffmaudiostartInfo;
  
      ffmaudio.Start();
  
      ffmaudio.WaitForExit(30000);
  
  
  
      /*ffmaudio.StartInfo.FileName = "cmd.exe";
  
      ffmaudio.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmaudioParams;
  
      ffmaudio.Start();
  
      ffmaudio.WaitForExit(30000);*/
  
  }

  So, what my code does, with the wavfilereader it gets the total length of my audio file, and then splits that time up by the number of images I have, so I can generate a video with the images split equally. Then I generate the video to a file called ’old.avi’, which is then used with my wav file to generate a new file called video.avi (which I am trying to have the generated video and audio together)

  My problem is when I generate the video it becomes uplayable. It claims to be (for example) 1 minute 50 seconds long, but once I click it, it won’t play. It just becomes unplayable, as you can see below

  http://i.imgur.com/tsck2NX.gifv

  I am using C# with process and Winforms, which opens the cmd line to run ffmpeg, with the 2 commands called above with the named variables below :

  ffmpegParams;
  
  ffmaudioParams;

  Which has all the commands I am using

  -r 1/ (audio length /divided by total images) so they're equal
  
  -t (to limit to the total time which is the audio's total seconds)
  
  ... I am using more as you can see in my code above

  How can I fix my problem, that I have described ?

  CMD line when generating the video :

  ffmpeg version N-86848-g03a9e6f 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. 68.100 / 55. 68.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, image2, from 'C:\Users\Laptop\Documents\program/images/image-%d.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 800x800, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  [mpeg4 @ 00000000024f44a0] bitrate tolerance 4000000 too small for bitrate 200000, overriding
  
  Output #0, avi, to 'C:\Users\Laptop\Documents\program/old.avi':
  
    Metadata:
  
      ISFT            : Lavf57.76.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x1280, q=2-31, 200 kb/s, 0.01 fps, 0.01 tbn, 0.01 tbc
  
      Metadata:
  
        encoder         : Lavc57.102.100 mpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=6.8 Lsize=      46kB time=00:01:37.57 bitrate=   3.9kbits/s speed=1.43e+003x
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 13.641467%

  When adding the audio to the video

  ffmpeg version N-86848-g03a9e6f 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. 68.100 / 55. 68.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, avi, from 'C:\Users\Laptop\Documents\program/old.avi':
  
    Metadata:
  
      encoder         : Lavf57.76.100
  
    Duration: 00:01:37.58, start: 0.000000, bitrate: 3 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x1280 [SAR 1:1 DAR 1:1], 0.01 fps, 0.01 tbr, 0.01 tbn, 40 tbc
  
  Guessed Channel Layout for Input Stream #1.0 : mono
  
  Input #1, wav, from 'C:\Users\Laptop\Documents\program/audio.wav':
  
    Duration: 00:01:37.57, bitrate: 352 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  
  Output #0, avi, to 'C:\Users\Laptop\Documents\program/video.avi':
  
    Metadata:
  
      ISFT            : Lavf57.76.100
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x1280 [SAR 1:1 DAR 1:1], q=2-31, 0.01 fps, 0.01 tbr, 0.01 tbn, 0.01 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=-1.0 Lsize=      55kB time=00:01:37.57 bitrate=   4.6kbits/s speed=1.95e+005x
  
  video:41kB audio:4kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 21.946869%

• Merge commit ’e481458bc308ee838deaeacac51929514762e7a7’

  26 avril 2016, par Derek Buitenhuis

  Merge commit ’e481458bc308ee838deaeacac51929514762e7a7’
  * commit ’e481458bc308ee838deaeacac51929514762e7a7’ :
  
    h264 : factor out pred weight table parsing into a separate file
  Merged-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/dxva2_h264.c
  • [DH] libavcodec/h264.c
  • [DH] libavcodec/h264.h
  • [DH] libavcodec/h264_mb.c
  • [DH] libavcodec/h264_mc_template.c
  • [DH] libavcodec/h264_parse.c
  • [DH] libavcodec/h264_parse.h
  • [DH] libavcodec/h264_parser.c
  • [DH] libavcodec/h264_refs.c
  • [DH] libavcodec/h264_slice.c
  • [DH] libavcodec/vaapi_h264.c

• Correct recording time of the first frame of a video

  27 juillet 2017, par Vítor Cézar

  How do I get the correct time of the first frame recorded on a video ? I executed the command

  ffprobe -v error -show_streams [file_path]

  and got these values of timecode and creation time for the first stream :

  TAG:creation_time=2017-07-26T16:48:10.000000Z
  
  TAG:language=eng
  
  TAG:handler_name=   GoPro AVC
  
  TAG:encoder=GoPro AVC encoder
  
  TAG:timecode=17:21:54:28

  The problem is that the video started being recorded on 16:48:11:504 and neither timecode nor creation time shows this value. If possible I need the precision on milliseconds.