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• ffmpeg command line write output to a text file

  16 avril 2015, par Asanka sanjaya

  I’m using this script for shot detection in ffmpeg.

  ffprobe -show_frames -of compact=p=0 -f lavfi "movie=test.mp4,select=gt(scene\,0.3)"

  I need to write the output into a text file in order to read the output from a c program. How can I do this ? Any help is appreciated.

• 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

  


• FFmpeg pass arguments in a text file

  30 novembre 2023, par yazanpro

  I'm trying to get around the 32767 characters limit regarding the command line length in Windows (sometimes it's less than that). I have a large number of boxes that I'm trying to draw on a video. Typically I can concatenate the draw commands using a comma (,) like so (the following command draws two boxes) :

  



  ffmpeg -i input.mp4 -vf "drawbox=enable='between(t, 1.5, 4)' : x=100 : y=100 : w=200 : h=200 : color=green,drawbox=enable='between(t, 9, 18)' : x=500 : y=10 : w=150 : h=150 : color=red" -codec:a copy output.mp4


  



  However since I have many boxes to draw, the length of the entire command becomes too large.

  



  Does FFmpeg offer a way to pass all arguments in a text file instead of literal text ? Something like this :

  



  ffmpeg content(ffmpegCmd.txt)


  



  If that's not possible, is it possible to "buffer" the arguments into separate commands while exporting the result only in the last command ?