[FFmpeg-user] Lossless concatenation of 2 MP4 files with video and multiple audio streams plus subtitles and chapter markers

[Rick Keniuk]

On 7/13/2024 3:08 AM, Vincent Deconinck wrote:
> On Sat, Jul 13, 2024 at 4:26 AM Rick Keniuk <daddyo323 at gmail.com> wrote:
>
>> I have tried the following simple concatenation command which worked
>> perfectly only it outputs just the video and the first audio stream.
>> ffmpeg -f concat -i videos.txt -c copy output.mp4
>>
> Hi Rick,
>
> By default only the first audio stream is output.
> Selection of streams can be done with the -map option, and -map 0 is a
> shortcut for "map all" - see https://trac.ffmpeg.org/wiki/Map
> Can you try the following :
>
> ffmpeg -f concat -i videos.txt -c copy -map 0 output.mp4
>
> Don't know about chapter markers though...
>
> KR,
>
> Vincent
>
>
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Thanks Vincent,

That worked.  I have all the audio streams and subtitles in my 
concatenated file (and the joining point is flawless with out a gap or 
stutter).  Sadly the chapters didn't merge though.  That current result 
may get by for now.

Based on some web searches I tried modifying the mapping to see if 
chapters would concatenate.  Only with the same result.  The "map 0" 
command probably implies "-map_metadata 0" and "-map_chapters 0".

ffmpeg -f concat -i videos.txt -c copy -map 0 -map_metadata 0 
-map_chapters 0 output.mp4

I found this discussion from 7 years ago and I fear that it exists today 
in this state.

https://trac.ffmpeg.org/ticket/6468