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• 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 ?

• Command line ffmpeg, to insert part of a mp3 audio to another file

  14 janvier 2020, par tgkprog

  Want to copy from 3rd second of b.mp3 till 2:05 seconds of b.mp3 and append to the end of a.mp3 (its 3:23 long).

  Command :

  ffmpeg -i a.mp3 -i b.mp3

  Output :

  ffmpeg version 4.0.4-0ubuntu1 Copyright (c) 2000-2019 the FFmpeg developers   built with gcc 8 (Ubuntu 8.2.0-7ubuntu1)
  
    configuration: --prefix=/usr --extra-version=0ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mp3, from 'a.mp3':
  
    Metadata:
  
      encoder         : Lavf58.12.100
  
    Duration: 00:02:48.00, start: 0.011021, bitrate: 144 kb/s
  
      Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 144 kb/s
  
      Metadata:
  
        encoder         : Lavc58.18
  
  Input #1, mp3, from 'b.mp3':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:01:33.02, start: 0.011995, bitrate: 117 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 117 kb/s
  
      Metadata:
  
        encoder         : Lavc58.18
  
  At least one output file must be specified