[FFmpeg-user] Can I add a codec for compatibility and automatically keep the original?

bbb ffmpeg-user at bugblatterbeast.de
Sun Nov 19 18:32:51 EET 2023

Hi, sorry for the late reply. I somehow missed your message. Thank you 
for the information.

I was looking for something that could be fully automated and so I've 
ended up creating a script that generates temp files with only the 
converted subtitles and then joins all streams in the final result file.

Kind regards

On 13.11.23 14:43, Moritz Barsnick wrote:
> Hi,
> On Sat, Nov 11, 2023 at 11:12:07 +0100, bbb wrote:
>> when I have a file using advanced subtitles, I often want to keep those for
>> most devices but also add a basic subtitle format that is supported by my
>> TV.
>> So far, I've been converting the subtitles and after that, mapping the
>> different subtitle format from the original and the output file into a final
>> file in a second operation. Surely it would also be possible to map the
>> original subtitles twice and then copy all codecs and convert only that of
>> the second subtitle stream.
> Sure you can. You map the relevant input stream twice, and copy the
> first one while converting the second one.
> Something like:
> $ ffmpeg -i video.ext -map 0:v -map 0:a -map 0:s -map 0:s -c:v copy -c:a copy -c:s:0 copy -c:s:1 srt output.ext
> (Or perhaps convert the first one, if it's important for your TV.)
>> I am planning to work on an automation (that works on a directory without
>> knowing the number of streams in each file) and wondering, if ffmpeg maybe
>> already has the kind of feature that I am looking for.
> I believe ffmpeg cannot automate the work on the number of streams. For
> the above scenario, you have to identify the streams first before
> constructing the command line. (So there's no "-map_if_exists 0:s"...)
> Cheers,
> Moritz
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