[FFmpeg-user] concat protocol - 3 objectives

Carl Zwanzig cpz at tuunq.com
Tue Feb 25 06:59:53 EET 2020

On 2/24/2020 4:29 PM, Mark Filipak wrote:
> Regarding Objective 3: Though a subtitle stream is not reported, the 5 
> concatenated sources do have subtitles. However, I think I have to get a 
> matroska container working before attempting to include the subtitles, so 
> this objective will have to wait.

Just confirming-

You're aware that dvd subtitles are actually overlay images, not encoded text?

Also, consider adding a long -analyzeduration and -probesize, unless the 
subtitle stream start quickly, the default values won't find it/them. (I've 
had movies where the subs started at least 60-80 seconds into the content.) 
I'd start with at least 500M, and if that doesn't immediately turn up the 
subs stream, double until it does.

I'm curious about this-
[mpeg @ 0000023c731a9000] New subtitle stream 0:6 at pos:116221966 and 
frame=159684 fps=2310 q=-1.0 Lsize= 4048589kB time=01:43:54.17

   that says the subtitles didn't start very well into the content, probably 
into file 3 or 4 (?). Is it possible that not all streams were copied when 
the vob files were collected?

FWIW, I've had very good luck ripping dvds with "dvddecrypter"; it's still 
available on the 'net and will output a single file with all streams if 
that's what you want.



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