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• Trying to concat videos from different sources with ffmpeg and get different broken results every time (partly no audio and/or fast forward video)

  30 octobre 2022, par Oliver

  I am using ffmpeg for years to create (merge and render) big video files from the (vaction) clips my sony camcorder produces. My basic workflow is to copy the mp4 files from the camcorder over to my pc, put the names in a file (file 'filename') and use the following command to create one big file that is playable by my apple tv :

  


  ffmpeg -f concat -safe 0 -i filelist.txt -c:v libx265 -preset slow -x265-params strong-intra-smoothing=0:merange=58 -crf 24 -c:a aac -b:a 320k -tag:v hvc1 output.mp4


  


  i cannot explain most of the arguments in total detail but i know that it works.
My problem occurred as i wanted to prepend some video clips recorded with an iphone to one of those files. So the first part seemed easy, the sony camcorder files have a resolution of 3840x2160 and the iphone video clips have a resolution of 1280x720 so at first i upscaled the iphone files using this command (i would have rather done in just one step but i do not know how to do that) :

  


  ffmpeg -i IMG_1182.MP4 -vf scale=3840:2160 IMG_1182_3840x2160.MP4


  


  then i just tried to add those upscaled video files to the filelist from the first command and ran the command for all clips again. Sadly that did not worked, as the resulting file contained all clips but only the iphone part had audio ! For the rest of the video the audio was missing. At this point i also did not noticed that the second part was played much faster (like played in fast forward mode). So guessed that i have to render the iphone and sony camcorder clips separately using the first command. That worked and i got two video files with perfect audio and video. My next step was to concatenate the resulting files using the following simple command :

  


  ffmpeg -f concat -safe 0 -i concatlist.txt -c copy output.mp4


  


  where concatlist contained both files.
Sadly that also did not worked. I do got a file containing both parts, this time with audio, but the video of the second part still was fast forward !

  


  I do not know what to do at this point, and i also do not understand enough to experiment with the options any more. Can someone explain to my what could be the problems here and how to solve them ?

  


• Revision 05a79f2fbf : Move EOB to per-plane data Continue migrating data from BLOCKD/MACROBLOCKD to t

  4 avril 2013, par John Koleszar

  Changed Paths : Modify /vp9/common/vp9_blockd.h Modify /vp9/common/vp9_invtrans.c Modify /vp9/decoder/vp9_decodframe.c Modify /vp9/decoder/vp9_detokenize.c Modify /vp9/decoder/vp9_idct_blk.c Modify /vp9/encoder/vp9_block.h Modify /vp9/encoder/vp9_encodeintra.c (...)

• Evolution #4657 : Renommage du menu maintenance

  10 février 2021, par cedric -

  Oui surtout pas "Maintenance technique" en première entrée, on a besoin de concision.

  Et dedans on va avoir "Bases de données" "Sauvegarder la base" "Restaurer la base" ?
  Franchement :
  - reorganiser une navigation c’est quand même plutot le truc qui se murit parce que c’est hyper sensible
  - c’est vraiment pas le plus stratégique et le plus critique
  - lancer ça à l’arrache pouf alors même qu’on est plutot en train d’essayer de serrer les boulons pour faire une release je vois pas trop la logique...

  Pour plus tard ok si tu veux, mais on va pas bacler...