[Webkit-unassigned] [Bug 103771] [GStreamer] support in-band text tracks

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103771





--- Comment #94 from Brendan Long <b.long at cablelabs.com>  2013-07-24 16:21:40 PST ---
Created an attachment (id=207418)
 --> (https://bugs.webkit.org/attachment.cgi?id=207418&action=review)
Output from adding a probe after the webvttenc and before the funnel.

I added probes before and after the funnel to see if something is going on in there, and I got some interesting output. It looks like part of the problem is that something is slow, so we get a cue exactly when we're supposed to:

Got data in at 0:00:12.149604166: 00:00:12.149 --> 00:00:14.977
Cosa ti porta nelle
terre dei guardiani?

But it leaves the funnel half a second late:

Got data out at 0:00:12.513583333: 00:00:12.149 --> 00:00:14.977
Cosa ti porta nelle
terre dei guardiani?

The other problem is that some of them come in *really* late:

Got data in at 0:00:18.188312500: 00:00:12.149 --> 00:00:14.977
Was treibt dich ins
Land der Torwächter?

Which is suspiciously just in time for the next cue:

Got data in at 0:00:18.189270833: 00:00:18.563 --> 00:00:20.087
למישהו מחפסת אני

(Video is Sintel: http://ftp.nluug.nl/ftp/graphics/blender/apricot/trailer/Sintel_Trailer1.480p.DivX_Plus_HD.mkv)

I'll keep investigating to see if the thread is being held up or something.

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