[FFmpeg-user] convert mkv to mp4

[Ferdi Scholten]

On 02-02-2025 02:31, Moritz Barsnick via ffmpeg-user wrote:
> On Sat, Feb 01, 2025 at 23:11:49 +0100, Ferdi Scholten wrote:
>> --disable-encoder=eac3 --disable-decoder=eac3
>> This is why the audio is not copied. This FFmpeg package from synology is severely crippled. Probably has to do with licensing i guess.
> Is that so? I would have thought that, for using the copy "codec", only
> the demuxers and possibly the parsers are required - no encoder or
> decoder for the respective codec. I'd try this, but don't have the time
> right now to compile.
>
> Furthermore, the version is extremely old:
>> ffmpeg version 4.1.9
> but _should_ be good enough for copying.
>
> I do understand that this is software pre-configured on the Synology
> NAS.
>
> Any chance of cross-compiling or even natively compiling a newer
> version of ffmpeg for/on the NAS, with the correct options?
>
> Moritz
>
You are changing containers, this means the audio has to be remuxed. It 
is a bit difficult to do that if the tools needed to know the structure 
of the audio are not there.