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• How to add libmp3lame, libx264, libvo_aacenc and libvorbis codecs to existing ffmpeg install on Redhat 6.7

  9 avril 2016, par rjn

  Adobe cq uses ffmpeg to transcode videos. There is a workflow that is triggered when a user uploads any video to the digital asset management (DAM) section. This workflow internally uses ffmpeg to transcode the uploaded video and spits out additional video renditions in formats like ogg, m4v, mp3.

  The server (Red Hat Enterprise Linux Server release 6.5) on which adobe cq runs needs to have ffmpeg installed for the DAM workflow to function. ffmpeg has already installed been installed, but it is missing certain codecs : libmp3lame, libx264, libvo_aacenc and libvorbis.

  How to add and enable these codecs ?

• A 'clean' way to cut an MP4 movie into two sections using FFMPEG ?

  30 août 2020, par Peter in Japan

  I am attempting to use FFMPEG to make a script that can easily split a short MP4 movie with sound into two pieces at a certain point. I've searched through what feels like hundreds of posts to try to find "the" answer, but most of my attempts end up with poor results, broken video files that cause my video play to freeze, and so on. I am attempting to make a script that allows me to easily cut a short anime movie (something grabbed from Twitter or some other short source) and cut it into two sections, so it can be under the 2:20 Twitter time limit, or to cut out some scene I don't want to show my followers.

  


  The issue is that FFMPEG is good at cutting videos into segments, but bad at know where keyframes are, so most videos have two seconds of blank video at the front before some keyframe appears, which looks terrible.

  


  One example I found that works well is below, which cuts any mp4 into a bunch of chunks of n second size (six seconds in the example below). Source and documentation for this is https://moe.vg/3b8eNTs

  


  ffmpeg -i seitokai.mp4 -c:v libx264 -crf 22 -map 0 -segment_time 6 -reset_timestamps 1 -g 30 -sc_threshold 0 -force_key_frames "expr:gte(t,n_forced*1)" -f segment output%03d.mp4

  


  This code works great, at least allowing me to access the "left" side of a video that I want, in this case a six-second segment I want. Can anyone tell me how to accomplish the above, but starting at the 13-second period in said video, so I could get right "right" (not starting from 00:00:00) video cut cleanly ?

  


  Alternately, a single, unified and elegant way to split (re-encode) an MP4 into two segments that forces keyframes from the very beginning of the cut pieces would be wonderful. I can't believe how hard this seems to be.

  


  Thanks in advance for any help you can give ! Greetings from rural Japan !

  


• Anomalie #3927 (Nouveau) : SVP avec SVP_PREFERER_TELECHARGEMENT_PAR_VCS n’installe pas un plugin d...

  27 mars 2017

  Bonjour,

  J’ai donc déclaré le dépôt http://files.spip.org/externals/archives_externals.xml
  Je cherche accessible, il me trouve bien « Video Accessible 0.6.10 - stable »
  Je cliquer sur Télécharger et activer.
  Et là :
  Actions réalisées
  Le téléchargement ou l’activation du plugin « Video Accessible » (version : 0.6.10) ne se sont pas correctement déroulés