Re: Detecting Duplicate Substream IDs

On 17/05/10 20:04, Elio Blanca wrote:

> Forced subtitles appear when the spoken language results as foreign
> to the listener, so they *have* to be shown in order to get the show
> enjoyable but hearing impaired users need them also. So they are
> stored just once, on the forced part of the track, in order to save
> IDs.

But there is no “forced part of the track”. Different streams require
different stream IDs, there’s no two ways about it.

>> But won’t the subpicture packets end up with overlapping timestamps?

> This actually never happens.

But what stops it from happening? Spumux does no checking of timestamps
on existing packets with the same stream ID, so that it can “squeeze in”
extra ones.

> Of course, this dance of multiple spumux pass will be avoided when
> this tool will be able to mux several streams at the same time.

You can pipe one execution into another, of course. But yes, I too have
thought about multiplexing several subpicture streams at a time. That
would mean putting something like an “id="streamid"” attribute on the
<stream> tag, instead of specifying the stream ID on the command line.
And allowing multiple <stream> tags, of course.

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