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• ffmpeg making flashing / blinking text

  16 septembre 2022, par samusugiru

  I'm trying to use ffmpeg to add blinking / flashing text to a short movie file.

  


  The code attached works for blinking text every 10th frame BUT the text only comes up for a single frame, so it's not very readable. I'd like it to hold for, say, 4 frames. I wonder if theres some kinda fancy combo using between as well as enable ?

  


  I'm semi new to this so my brain stopped when trying to come up with a solution.

  


  ffmpeg -i input.mov -vf "drawtext=text='TEXTY':enable= (not (mod(n\,10)) )" output.gif


  


• Need help combining commands in to a script to run in Ubuntu

  17 juin 2020, par user298294

  I have a bunch of video files with DTS audio that I need to convert to AC3. I have found commands that can do different parts of the task but I'm not sure how to put it all together to make a script that works. I have found the following script that will convert the audio from all my files to AC3 however I would prefer for it to only convert the DTS audio files to AC3. The script is as follows.

  



  shopt -s globstar
for f in **/*.mkv; 
do 
    fname="${f##*/}"
    ffmpeg -i "$f" -c:v copy -c:s copy -c:a ac3 "/some/directory/$fname" &&
    mv "/some/directory/$fname" "$f"
done


  



  I have also found this command that will return what sort of audio codec the mkv file is using.

  



  `ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=nokey=1:noprint_wrappers=1 input.mkv`


  



  So I'm wondering how I can combine the two to create a script that will do what I want it to do. I'm guessing I can add an if function using ffprobe at the beginning of the script ? Something like this...

  



  shopt -s globstar
for f in **/*.mkv; 
do 
    fname="${f##*/}"
    if ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of 
       default=nokey=1:noprint_wrappers=1 "$f" | egrep "DTS"; then
       ffmpeg -i "$f" -c:v copy -c:s copy -c:a ac3 "/some/directory/$fname" &&
       mv "/some/directory/$fname" "$f"
    fi
done


  



  Are there any problems with that ? I haven't written scripts since I was in high school playing around with my graphics calculator because I was bored so any help would be greatly appreciated.

  


• mpegaudio_parser : add MP3 ADU headers parser

  13 février 2015, par Gilles Chanteperdrix

  mpegaudio_parser : add MP3 ADU headers parser
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/mpegaudio_parser.c
  • [DBH] libavcodec/mpegaudiodecheader.c
  • [DBH] libavcodec/version.h