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• Print results at conclusion of bash 'for loop'

  4 juin 2016, par Matthew Schwarz

  I’m a beginner.
  I have a Bash script that embeds subtitles into mkv files if they exist in a directory.

  for i in *.mkv; do
  
      if [ -f "${i%mkv}"*"srt" ]; then
  
          ffmpeg -i "$i" -f srt -i "${i%mkv}"*"srt" -map 0:0 -map 0:1 -map 1:0 -c:v copy -c:a copy -c:s srt $i.output.mkv
  
          mv "${i%mkv}"*"srt" "${i%mkv}srt".old
  
          mv $i $i.old
  
          mv $i.output.mkv $i
  
      else
  
          echo $i "does not have srt file"
  
      fi
  
  done

  It looks for all .mkv files that have an associated .srt file and does some ffmpeg magic to it. If it does not find an associated .srt file it says that the .mkv file "does not have srt file."

  How can I make it so that at the conclusion of the for loop I get a print out of all the .mkv files that did have an .srt file and did successfully do all the other actions ?

  Thank you.

• ffmpeg crashes for large “-filter_complex_script” inputs

  7 février 2016, par user1605871

  I’m experiencing an issue where ffmpeg seg faults for very large "-filter_complex_script" input files (roughly 3MB). The input file consists of a very large number of drawbox filters. The same processing pipeline works fine for smaller files, but seems to have an issue as the file size increases. Is there a hard limit to how large this file can be ? If so, is there a "magic number" somewhere that we can increase and re-compile from source ?

  We tried looking at core-dump of error and nothing useful came of of it. The error message is ffmpeg execution failure, that’s all we have to off of.

  Does anyone have any other thoughts or advice ?

  Thanks in advance !

• Animated GIF to video with ffmpeg - wrong timing

  27 juillet 2017, par BarbaraKwarc

  I’m trying to convert an animated GIF to video with ffmpeg, but there’s a strange problem : the time delays of each frame seem to be off by one frame.
  For example, if the frame #1 is supposed to be shown for 2000 ms and the frames from #2 to #10 are supposed to be shown for 100 ms each, in the resulting video it immediately skips to the frame #2 which is shown for 2000 ms instead :P

  Is this some kind of a bug ? Or am I doing something wrong ?

  Here’s my command line :

  ffmpeg –i Mnozenie_anim_deop.gif Mnozenie_anim.mp4

  (Aside : why doesn’t the "-" show up in code blocks unless I replace it with "–" ?)

  so nothing extraordinary, just the defaults. (Unless this is the root of the problem ? Maybe my defaults are bad, and I need to specify some magic options ?)

  This problem seems to appear for any video formats except MKV, and when I play these files in mplayer, they all behave that way except MKV.

  But when I open them in kdenlive (a non-linear video editing program), the problem appears in all of them, including MKV (which is strange, because it plays back just fine in mplayer :q ).

  I tried converting the same exact file with this online converter here :
  https://ezgif.com/gif-to-mp4
  and there is no problem with its output – it plays back fine both in mplayer and when imported to kdenlive, so I guess they must have been using some magic command line options that I’m missing.

  Any ideas what can be wrong and how to track down the culprit ?

  Edit : Here’s a sample animated GIF file I’m trying to convert :
  http://nauka.mistu.info/Matematyka/Algebra/Szeregi/Mnozenie_anim.gif
  and the MP4 file that I generated from it which demonstrates this problem :
  http://sasq.comyr.com/Stuff/Mnozenie_anim.mp4
  As you can see, the fade in starts prematurely but stops for a couple of seconds instead of waiting for a couple of seconds BEFORE the fade in begins.