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• How to repair a raw H.264 stream using FFmpeg

  13 janvier 2020, par Chris Kennedy

  I apologize if I start rambling or seem incoherent.

  Preface : My house caught on fire last week.

  I have been trying to get the footage off my security camera system (Zmodo, don’t ever buy this crap) to share with the fire marshal and my insurance. I can’t get it off the "proper" way because the box doesn’t detect any drive or any file system I throw at it, and none of their viewing apps (for Android or Windows) allow video downloads.

  I was able to get the files directly from the system’s hard drive, but they’re (of course) messed up in such a way that I can’t just open up VLC (or even Zmodo’s own viewing software !) and view them. I have spent several hours scouring the web for various ways to run it through FFmpeg to see if it can repair the file, but I’ve had no luck so far and my mind is already stretched thin with everything else.

  This is the output from ffprobe :

  ffprobe version 4.2.1 Copyright (c) 2007-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    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
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  [h264 @ 000002479ee1c180] Format h264 detected only with low score of 1, misdetection possible!

  Then this repeats several dozen times :

      Last message repeated 1 times
  
  [h264 @ 000002479ee1de40] decode_slice_header error
  
  [h264 @ 000002479ee1de40] no frame!
  
  [h264 @ 000002479ee1de40] non-existing PPS 0 referenced

  And it finishes off with this :

  [h264 @ 000002479ee1c180] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, h264, from '.\recfile_-200102-130000-135959-00001100.264':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264, none, 25 fps, 25 tbr, 1200k tbn, 50 tbc

  I have tried several options with ffmpeg, including force_key_frames, setting the analyzeduration and probesize options to max_int, tried a -c copy, forcibly specified x264, tried to force a specific resolution (which it should all be standard HD video), and several others that I can’t recall at the moment.

  The video files are also accompanied by a .IDX file, but I haven’t figured out how important they are if they are at all to the video file.

  I can provide links to the smallest video and its associated IDX if needed, but if anyone can think of anything else to try on these files I’d greatly appreciate it.

• Python Virtualenv & Youtube_dl : ffprobe or avprobe not found. Please install one

  25 janvier 2020, par J. Diaz
  • My goal : Download podcast as MP3
  • Used Python, Flask and Youtube_dl on Ubuntu 18.04 and Nginx
  • I followed this tutorial to set up my server : Flask app with uSWGI and Nginx

  Point 1 : Deployment was successful and running a simple flask app in the browser works.
  Point 2 : I add the following code to my simple flask route to be rendered.

  @app.route('/video', methods=['POST'])
  
  def videoland():
  
  
  
      ydl_opts = {
  
          'format': 'bestaudio/best',
  
          'verbose': True,
  
          'postprocessors': [{
  
              'key': 'FFmpegExtractAudio',
  
              'preferredcodec': 'mp3',
  
              'preferredquality': '192',
  
          }],
  
          'postprocessor_args': [
  
              '-ar', '16000'
  
          ],
  
          'prefer_ffmpeg': True,
  
      }
  
  
  
      with youtube_dl.YoutubeDL(ydl_opts) as ydl:
  
          ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])
  
  
  
      return Response('Response test')

  Here is the problem : When I render this page, I receive 500 error and ’Response test’ is never shown.
  However, the MP3 file gets to be downloaded in my project directory without problems (Sounds perfect)

  By checking ’journalctl’ of my project, I find the following :

  [debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
  
  [debug] youtube-dl version 2019.11.28
  
  [debug] Python version 3.6.9 (CPython) - Linux-4.15.0-1051-aws-x86_64-with-Ubuntu-18.04-bionic
  
  [debug] exe versions: none
  
  [debug] Proxy map: {}
  
  [youtube] BaW_jenozKc: Downloading webpage
  
  [youtube] BaW_jenozKc: Downloading video info webpage
  
  [debug] Invoking downloader on 'https://r3---sn-aigl6nl7.googlevideo.com/videoplayback?expire=1579853383&ei=51EqXpe4HZiuxgKiz4SYBw&ip=35.178.16.206&id=o-AP8Cssz7OHlOd6PRswoEVAAVY7kfgYf0ZV-jL_TE9HZH&itag=140&source=youtube&requiressl=yes&mm=31%2C29&mn=sn-aigl6nl7%2Csn-aigzrn7z&ms=au%2Crdu&mv=m&mvi=2&pl=15&initcwndbps=860000&vprv=1&mime=audio%2Fmp4&gir=yes&clen=157753&dur=9.891&lmt=1387961817989105&mt=1579831690&fvip=3&keepalive=yes&fexp=23842630&c=WEB&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=ALgxI2wwRQIgI4XTN3uqTHc10HQcotiqwL8-hSqUwnop-mrrYaIwICsCIQCSeyXDEvxEVafgIOWkMloobolXXoWRYHqzPH3fh2OfOA%3D%3D&lsparams=mm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHylml4wRQIgZKbNf2W3csHWf1leFuPJHx07S8sRJLL0-luUuXb5BqACIQD7WbHSG0E17nyoq0yTB8udlgt0-1drPysUoYKp0V539w%3D%3D&ratebypass=yes'
  
  [download] youtube-dl test video ''_ä↭T

• how to fix errors while converting yuv to mp4 using ffmpeg, with out compression

  10 janvier 2020, par johanna

  I am trying to convert a yuv file to mp4, without further compression, using :
  ffmpeg -f rawvideo -s 768x432 -r 50 -i test.yuv -c:a acc -strict experimental test.mp4 but I am getting the following error :

  ffmpeg version N-94000-g78e1d7f Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
  
    configuration:
  
    libavutil      56. 28.100 / 56. 28.100
  
    libavcodec     58. 52.102 / 58. 52.102
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 55.100 /  7. 55.100
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
  [rawvideo @ 0x22f0700] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from 'test.yuv':
  
    Duration: 00:00:00.38, start: 0.000000, bitrate: 198476 kb/s
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 768x432, 199065 kb/s, 50 tbr, 50 tbn, 50 tbc
  
  File 'test.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf58.27.103
  
      Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 768x432, q=2-31, 200 kb/s, 50 fps, 12800 tbn, 50 tbc
  
      Metadata:
  
        encoder         : Lavc58.52.102 mpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  test.yuv: corrupt input packet in stream 0
  
  [rawvideo @ 0x22fa780] Invalid buffer size, packet size 469698 < expected frame_size 497664
  
  Error while decoding stream #0:0: Invalid argument
  
  frame=   18 fps=0.0 q=24.8 Lsize=    3340kB time=00:00:00.34 bitrate=80445.8kbits/s speed=3.51x
  
  video:3339kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.028110%

  I am also trying : ffmpeg -f rawvideo -s 768x432 -r 50 -i test.yuv -c:a acc -strict experimental test.mp4 but I am getting the following error :

  ffmpeg version N-94000-g78e1d7f Copyright (c) 2000-2019 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36) configuration: libavutil      56. 28.100 / 56. 28.100 libavcodec     58. 52.102 / 58. 52.102 libavformat    58. 27.103 / 58. 27.103 libavdevice    58.  7.100 / 58.  7.100 libavfilter     7. 55.100 /  7. 55.100 libswscale      5.  4.101 /  5.  4.101 libswresample   3.  4.100 /  3.  4.100 [rawvideo @ 0x22f0700] Estimating duration from bitrate, this may be inaccurate Input #0, rawvideo, from 'test.yuv': Duration: 00:00:00.38, start: 0.000000, bitrate: 198476 kb/s Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 768x432, 199065 kb/s, 50 tbr, 50 tbn, 50 tbc File 'test.mp4' already exists. Overwrite ? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native)) Press [q] to stop, [?] for help Output #0, mp4, to 'test.mp4': Metadata: encoder         : Lavf58.27.103 Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 768x432, q=2-31, 200 kb/s, 50 fps, 12800 tbn, 50 tbc Metadata: encoder         : Lavc58.52.102 mpeg4 Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 pr_768x432_50_QP22.yuv: corrupt input packet in stream 0 [rawvideo @ 0x22fa780] Invalid buffer size, packet size 469698 < expected frame_size 497664 Error while decoding stream #0:0: Invalid argument frame=   18 fps=0.0 q=24.8 Lsize=    3340kB time=00:00:00.34 bitrate=80445.8kbits/s speed=3.51x video:3339kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.028110%

  how can I solve these errors ?