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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
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List of compatible distributions
26 avril 2011, parThe table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...) -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...)
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FFMPEG Seeking with concat demuxer causes video & audio to be out of sync
20 février 2023, par GaruukI have a very simple use case that's driving me bananas.


My problem and question :


I'm using ffmpeg version 5.1.2 on a MacOS and i'm using ffmpeg seeking and concat demuxer to cut many 1 minute videos into 15 seconds chopped up over 12 clips where every clip is just 2 seconds from the same video (kind of like a mini teasers for the video). I would really like to not have to re-encode to make the video processing as fast as possible.


First, I take each 1 minute video and cut it up into 12 clips (I do all this programmatically in python fwiw)


ffmpeg -ss 0 -i input.mp4 -t 2 -c copy -y cut_1.mp4
ffmpeg -ss 4 -i input.mp4 -t 2 -c copy -y cut_2.mp4
ffmpeg -ss 8 -i input.mp4 -t 2 -c copy -y cut_3.mp4
...
...



I then write all the output file names to my
concat_manifest.txt


file cut_1.mp4
file cut_2.mp4
...
...



Then I run my concat command :


ffmpeg -f concat -i concat_manifest.txt -c copy -y concat_video.mp4



This works really fast but the audio and video at the stitch point get out of sync and sometimes the video just chokes & lags. It's mostly not a smooth experience.


What I have tried :


- 

- using the concat protocol with intermediate profiles : ffmpeg.org/wiki/Concatenate#demuxer
- Putting the -ss when I seek after the -i. This makes everything worse
- Playing around with different -ss values. This has some noticeable affects but it's not obvious why yet.
- I've also read from the ffmpeg resource regarding seeking and copying :










Which leads me to believe that maybe because ffmpeg is using timestamps instead of frames, seeking isn't accurate using -ss when using the concat demuxer


Is there a way to get concat demuxer cutting and concatenating the video where the audio is somewhat in sync with the video ?


Thanks


EDIT : I found an answer and i'll be posting the solution in the coming few days.