ffmpeg concat demuxer freezes my video frames whil

Question

I am trying to concat 6 WebM video file same resolution and same codecs using this command ffmpeg -f concat -i mylist.txt -c copy finalvideo.webm but the resulted video freezes some part ,exactly where the each part concatenated and yes I am using the latest ffmpeg

resulted video audio spectrum you easily see the video audio freezes

https://i.stack.imgur.com/SX6WT.gif

mylist.txt

file '1.webm'
file '2.webm'
file '3.webm'
file '4.webm'
file '5.webm'
file '6.webm'

My log

https://pastebin.com/Rzqr6w3b

Answer 1

This is probably caused by the codec's encoding needing to reset at each join point. Remove the requirement that the codec's be copied and either let ffmpeg reencode it with the default settings or specify a specfic codec and settings of your own to reencode the stream.

Default:

ffmpeg -f concat -i mylist.txt finalvideo.webm

Or choose specific codecs:

ffmpeg -f concat -i mylist.txt -c:v libvpx -c:a libvorbis finalvideo.webm