[FFmpeg-user] concat Missing part2.mov

[Lou Logan]

On Sat, Mar 24, 2018, at 3:10 PM, Dan Norton wrote:
> I have two .mov files which were made on Debian 9 by running the
> following:
> 
> $ ffmpeg -y -i "Norton 8mm Reel 04.mov" -ss 00:00:00 -to 00:20:00 -c
> copy -bufsize 2048K part1.mov 
> $ ffmpeg -y -ss 00:21:12 -i "Norton 8mm Reel 04.mov" -c copy -bufsize
> 2048K part2.mov
> 
> Viewed individually part1 and part2 are OK. When I tried to concatenate
> them, the output is missing part2. Here's what I did:
> 
> $ ffmpeg -i "concat:part1.mov|part2.mov" -c copy
> out.mov 

The concat protocol is too simplistic for this format. It can only be used with inputs that support file level concatenation.

Use the concat demuxer instead.

https://ffmpeg.org/ffmpeg-formats.html#concat-1
https://trac.ffmpeg.org/wiki/Concatenate#demuxer