[FFmpeg-devel] Another possible bug in dvbsub.c

Tomas Härdin tomas.hardin
Wed Feb 16 08:50:29 CET 2011

Ronen Mizrahi skrev 2011-02-16 03:05:
> On Sat, Feb 12, 2011 at 5:27 PM, Ronen Mizrahi<ronen at tversity.com>  wrote:
>> Hello,
>> The problem with current dvbsub encoded with ffmpeg is that the subtitles
>> are not remove from display as expected (they remain displayed for a much
>> longer period, unless some other sub replaces them). This was tested with
>> VLC, ffplay, and also with other hardware devices (set-top-boxes).
>> By comparing to VLC code base (
>> http://git.videolan.org/?p=vlc.git;a=blob;f=modules/codec/dvbsub.c;h=432f9b0bb18ee300080af6a30a1fc8648cae7492;hb=HEAD)
>> we were able to make a small change that seem to have fixed the
>> problem: when hide_state is TRUE, no region related information should be
>> written. This is unlike the current code where it does write the region ids
>> and their x,y position, as well as some other information.
>> Since I am not a dvbsub expert and since the spec is not very clear with
>> regard to this situation I wanted to see if someone on the list can confirm
>> this correction. If so, I am happy to submit a patch.
>> Best,
>> Ronen
> Any feedback from someone on the list? Would you consider a patch?

Well, it's hard to comment on patches that aren't attached :)  Also, if 
it fixes the subs for a lot of players as well as STBs, then ovbiously 
such a patch is of interest.


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