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

Ronen Mizrahi ronen
Wed Feb 16 03:05:21 CET 2011

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?

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