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• nomenclature #2343 (Fermé) : SPIP 3... beta

  19 septembre 2011, par jluc -

  Une version de SPIP3 se prépare, mais quelques aspects centraux à cette version doivent encore être finalisés ou n’ont pas encore été suffisamment testés et rodés.

  squelettisation de l’espace privé : les premiers thèmes ont été ébaûchés, mais les retours de ces premières expériences n’ont pas encore été (...)

• Decode h264 example ios 7 frame by frame

  18 février 2016, par Андрей Ярядом

  Good day.

  I have a ip camera. From it frame by frame comes stream h264.

  On the Internet, in particular on stackoverflow, a lot of information about how to decode h264 on iOS.
  But this information is not clear.
  I ask you to show me an example and show right direction of how to decode a frame by frame h264 stream to iOS 7.

  What options I have seen and what I know about them :

  • ffmpeg - not suitable for me, as it has LGPL license.

  • AVAnimator library - license inappropriate for me.

  • Hardware decoder - the best solution, but as I understand it, is only
    available for iOS 8.

  For me to be the perfect option if you give me an example for correct decoding h264 stream and display it on the way to the screen.

  Regards.

• How use FFMPEG to merege multiple audios and videos with delay and offset for any streams

  9 juillet 2020, par Morak

  I want to use FFMPEG to merge multiple audios and videos.

  


  Materials are :

  


  

  1. three short audio clips (S1.mp4, S2.mp4, S3.mp4) without video(files
only have audio stream),

  


  2. three video clips (V1.mp4, V2.mp4, V3.mp4) without sound(files only have video stream).

  


  


  I have start-time of all materials(i.e :

  


  start-time of "S1.mp4" is 0 sec...
start-time of "S2.mp4" is 1220.5 sec...
start-time of "S3.mp4" is 2500.12 sec...


  


  and

  


  start-time of "V1.mp4" is 15.22 sec...
start-time of "V2.mp4" is 853.99 sec...
start-time of "V3.mp4" is 2901.37 sec...)


  


  My goal is :

  


  Merge all videos and audios to single file with entering in their start time.

  


  The requirement is depicted like below(D=delay).

  


  D <—V1.mp4—> D <----------V2.mp4-------------> D <-V3.mp4->blank

  &#xA;

  <------------S1.mp4-----> D <-------S2.mp4—> D <-------S3.mp4------->

  &#xA;

  The command I use is as below, but it does not work as expected.

  &#xA;

  1st:prepare V.mp4(merging all videos) :

  &#xA;

  ffmpeg -itsoffset {OFFSET.V1} -i V1.mp4  -itsoffset {OFFSET.V2} -i V2.mp4  -itsoffset {OFFSET.V3} -i V3.mp4 -map 0:v -map 1:v -map 2:v -c:v copy V.mp4

  &#xA;

  2nd:prepare S.mp4(merging all audios) :

  &#xA;

  ffmpeg -i S1.mp4 -i S2.mp4 -i S3.mp4 -filter_complex "[0]adelay=0[aud1];[1]adelay=1220.5[aud2];[2]adelay=2500.12[aud3];[aud1][aud2][aud3]amix=3[a]" -map "[a]" -c:a copy S.mp4

  &#xA;

  final:merging V.mp4 with S.mp4 :

  &#xA;

  ffmpeg -i V.mp4 -i S.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy final.mp4

  &#xA;

  Any hint is appreciated !

  &#xA;