[FFmpeg-devel] DVB Subtitles

JULIAN GARDNER joolzg at btinternet.com
Wed Dec 4 14:38:19 CET 2013

----- Original Message -----
> From: Reimar Döffinger <Reimar.Doeffinger at gmx.de>
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Cc: 
> Sent: Wednesday, 4 December 2013, 14:25
> Subject: Re: [FFmpeg-devel] DVB Subtitles
> On Wed, Dec 04, 2013 at 02:20:14PM +0100, Reimar Döffinger wrote:
>>  On Wed, Dec 04, 2013 at 12:27:59PM +0100, Nicolas George wrote:
>>  > Le quartidi 14 frimaire, an CCXXII, JULIAN GARDNER a écrit :
>>  > > Why as this is a development problem!
>>  > 
>>  > I see no patch.
>>  > 
>>  > > The code needs changing to take into account that what is 
> happening now is
>>  > > wrong, 
>>  > 
>>  > This is not proven, since you did not provide the full console output.
>>  Whatever, the question is whether this code in ffmpeg_filter.c is is
>>  right or not:
>>      /* Compute the size of the canvas for the subtitles stream.
>>         If the subtitles codec has set a size, use it. Otherwise use the
>>         maximum dimensions of the video streams in the same file. */
>>  I can tell you already now that it is wrong (at least in the sense of not 
> being
>>  optimal), since no vobsubs as far as I know exist made for video 
> resolutions less
>>  than full TV resolutions.
>>  However almost all old analog captures will use less than full resolution
>>  (since they either could not be done in real-time or be too large).
> Actually a better and more common example might be CD-sized encodes of DVD rips,
> since you'd not easily get digital subtitles with analog captures.
> And there might potentially be an issue with the same code being used
> for all of vob, dvb and other subtitle types, it might be possible that
> the trick would be to distinguish between the types.
> Maybe there is even a rule that for DVB no DDS means 720x576 canvas,
> since the issues I know about are in fact only for vobsub...
See my reply to your last email

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