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• ffmpeg how to attach & extract text/data file to audio or video stream ?

  9 février 2021, par user2718593

  I have :

  


  1/ AUDIO.m4a stream

  


  2/ a cover album jpeg

  


  3/ an UTF8 text file

  


  I wish to bind all of them into a mkv/mp4 container.

  


  To bind the audio & image I can

  


  ffmpeg -y -i "AUDIO.mp4" -attach COVER.jpg -metadata:s mimetype="image/jpeg" -c:a copy "AUDIO_COPY_WITH_COVER.mka"

  


  Further to bind the text file

  


  ffmpeg -y -i "AUDIO_COPY_WITH_COVER.mka" -c copy -attach "TEXT.txt" -metadata:s:2 mimetype=application/octet-stream "AUDIO_JPEG_TEXT.mkv"

  


  If I check I get :

  


  


  Input #0, matroska,webm, from 'AUDIO_JPEG_TEXT.mkv' :
Metadata :
MINOR_VERSION : 512
COMPATIBLE_BRANDS : M4A isomiso2
MAJOR_BRAND : M4A
ENCODER : Lavf58.45.100
Duration : 00:36:10.36, start : 0.000000, bitrate : 67 kb/s
Stream #0:0 : Video : mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 320x240 [SAR 1:1 DAR 4:3], 1k tbr, 1k tbn, 1k tbc (default)
Metadata :
FILENAME : COVER.jpg
MIMETYPE : image/jpeg
DURATION : 00:00:00.000000000
Stream #0:1 : Audio : aac (HE-AAC), 44100 Hz, stereo, fltp (default)
Metadata :
HANDLER_NAME : SoundHandler
MIMETYPE : image/jpeg
DURATION : 00:36:10.358000000
Stream #0:2 : Attachment : none
Metadata :
filename : TEXT.txt
mimetype : application/octet-stream

  


  


  Question :

  


  1/ How do I extract my text file ?

  


  ffmpeg -i "AUDIO_JPEG_TEXT.mkv" -map 0:t -metadata:s:2 mimetype=application/octet-stream "my text.txt"


  


  I get the error :
Unable to find a suitable output format for 'my text.txt'
my text.txt : Invalid argument

  


  **2/If I replace the command with **

  


  ffmpeg -y -i "AUDIO_COPY_WITH_COVER.mka" -c copy -attach "TEXT.txt" -metadata:t:2 mimetype=application/octet-stream "AUDIO_JPEG_TEXT.mkv"

  


  Excuting
ffmpeg -i "AUDIO_JPEG_TEXT.mkv"

  


  get error

  


  EBML header parsing failed
AUDIO_JPEG_TEXT.mkv : Invalid data found when processing input

  


  2/ How can I write in one command the 3 attachments(audio,img,document) ?

  


  Thanks

  


• FFMpegWriter not using the bitrate specified ? Animation is very blurry

  18 mai 2022, par cebo

  I am using matplotlib's FunAnimation as well as FFMpegWriter to try to write a simulation animation to a file. I'd like to save a high quality version of it, but when I increase the bitrate value of the writer, the actual bitrate of the .mp4 it creates seems to increase in discrete steps up to a fairly low value after which it doesn't increase any more whatsoever.

  


  My code is roughly :

  


  dpi = 96&#xA;fig = plt.figure(figsize=(width/dpi, height/dpi), dpi=dpi)&#xA;anim = FuncAnimation(fig, myAnimation, frames=100, interval=1, blit=True)&#xA;writer = animation.FFMpegWriter(fps=10, bitrate=<some number="number">)&#xA;anim.save(&#x27;MyAnimation.mp4&#x27;, writer=writer)&#xA;</some>

  


  The animation is only 200x200px so I feel like it shouldn't be a problem to have a high quality video, but I can't seem to get a high enough bitrate. For the following bitrates specified in my code, the actual bitrate shown in the files properties are :

  


  BR In Code   => Actual BR (kbps)
-1 / None    => 13
100          => 58
1000         => 76
10000        => 76


  


  The bitrate doesn't seem to track very well at all, and won't go above 76kbps at all. The video is still badly blurry at this bitrate.

  


  What do I need to do to increase the bitrate or else the quality of the video file ?

  


  Alternatively, is there a better video format/writer to use for this purpose ? Specifically one that is broadly supported so I could embed it in a website or upload it to YouTube or something like that.

  


  Edit :

  


  To be more specific about the issue, neighboring pixels are being blended together, resulting in a blurry look. The following imgur album shows several examples with different settings :

  


  https://imgur.com/a/cxQnV4x

  


  These include the view in the figure window from plt.show(), default bitrate, a "high" bitrate, and something else I just tried which was to increase the dpi. While the results are much nicer it also nearly doubled the execution time so I'd like to avoid it.

  


  It seems silly to have to upscale what is effectively "pixel art" in order for it to look good, but I guess this is an artifact of the signal processing approach mpeg uses, which is why I suspect a different file format might be the best solution for small framed animations like this. If I wanted to do a 1920*1080 animation the blurring would probably be less of an issue.

  


• python call of ffmpeg misses target file parameter

  2 décembre 2016, par Fred

  I’m writing a python GUI for ffmpeg. When calling ffmpeg via subprocess it runs fine as long as the command is like

  subprocess.Popen([ffmpeg_converter,
  
          '-i',file,
  
          target_file
  
          ])

  But when I do the same call with ffmpeg arguments it fails with
  "At least one output file must be specified" :

  option_string = '-q:a 4'
  
  subprocess.Popen([ffmpeg_converter,
  
          '-i',file,
  
          option_string,
  
          target_file
  
          ])

  It even recognizes the options but does not see the target file. I even replaced the actual target file with someting simple like "test.mp3" but still the same error. Any ideas ? (I’m on windows with python 3.3.)

  The complete console output is :

      ffmpeg version N-57781-g0610d6e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov  1 2013 18:01:35 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 49.100 / 52. 49.100
  
    libavcodec     55. 40.101 / 55. 40.101
  
    libavformat    55. 20.105 / 55. 20.105
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Trailing options were found on the commandline.
  
  Input #0, flac, from 'c:\script\python\testdata\source\01. Es geht los.flac':
  
    Metadata:
  
      ARTIST          : Olivia Trummer Trio
  
      TITLE           : Es geht los
  
      ALBUM           : Westwind
  
      DATE            : 2008
  
      track           : 01
  
      GENRE           : Jazz
  
      COMMENT         : EAC FLAC -8
  
    Duration: 00:06:27.25, bitrate: 834 kb/s
  
      Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
  
  At least one output file must be specified