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• Need encoding from images to video on Android

  12 septembre 2016, par a2ronus

  We need an Android app that can encode a folder of images to a video. I have been looking for solutions a while now, but cannot find anything good. The Android API does not support it. We are trying ffmpeg, but cannot get it to work. We need a working solution, using ffmpeg is not mandatory. A full Android Java solution is also a possibility, since this would work on all Android devices, possibly at the cost of some performance.

  The app also needs to be able to add an audio track to the movie if the user chooses to do this.

  Any help would be appreciated.

  Kind regards,

  Aäron

• Anomalie #2243 : Les apostrophes (’) posent problème dans les titres des documents

  25 août 2011, par Aurélien Roux

  Denisb a proposé cette solution (et l’a testée, je crois de son côté), et elle ne fonctionne pas non plus. La seule solution est d’utiliser #TITRE|textebrut, mais ça ressemble plus à une astuce qu’à une solution.

• ffmpeg stream offset command (-itsoffset) not working

  12 juillet 2013, par jen

  I would really appreciate if someone could give some pointers regarding the use of itsoffset with ffmpeg. I have read a number of posts on this subject, some of them explain very clearly how to re-synchronize audio and video with -itsoffset, but I haven't been able to make it work.
  My avi file is encoded with ffmpeg, in two passes, using the following command for the second pass :

  ffmpeg -i whole-vts_01.avs -pass 2 -y -vcodec libxvid -vtag XVID -b:v 1300K -g 240 -trellis 2 -mbd rd -flags +mv4+aic -acodec ac3 -ac 2 -ar 48000 -b:a 128k output.avi

  For whatever reason, I end up with a 1 sec delay in the video (or the audio is 1 sec early). It doesn't happen too often but I see it from time to time.
  Among other attempts, I have tried the following :

  (1) ffmpeg -i output.avi -itsoffset 00:00:01.0 -i output.avi -vcodec copy -acodec copy -map 0:0 -map 1:1 output-resynched.avi
  
  (2) ffmpeg -i output.avi -itsoffset 00:00:01.0 -i output.ac3 -vcodec copy -acodec copy -map 0:0 -map 1:0 output-resynched2.avi
  
  (3) ffmpeg -itsoffset -00:00:01.00 -i output.avi output-resynched8.avi
  
  (4) ffmpeg -i output.avi -itsoffset -1.0 -i output.avi -vcodec copy -acodec copy -map 0:1 -map 1:0 output-resynched13.avi

  Here are the results :

  1. Audio garbled and only 5m 35 s long vs. 1h 41m.
  2. (Output.ac3 is audio component of output.avi) Video and audio
     identical to original, offset didn't work
  3. Audio did get shifted, but original encoding parameters replaced with default ones (as expected).
  4. Audio garbled and only 9m 56s long vs. 1h 41m.

  I see that many people explain, and apparently use the process described above, but it doesn't seem to be working for me. Am I missing something obvious ? I would very much like to be able to use -itsoffset as it is cleaner than my workaround solution.

  FWIW, here is a different, and longer way of obtaining the desired result :

  First create a shifted video only file using -ss :

  ffmpeg -i output.avi -ss 1.0 -vcodec copy -an oupput_videoshifted.avi

  Then extract the audio :

  ffmpeg -i output.avi -vn -acodec copy outputaudioonly.ac3

  And finally remux both components :

  ffmpeg -i output_videoshifted.avi -i output_audioonly.ac3 -vcodec copy -acodec copy -map 0:0 -map 1:0 output-resynched14.avi

  The process works, is fast enough, but I would really prefer to use the one pass -itsoffset solution.