Re: [FFmpeg-devel] [FFmpeg-cvslog] fftools/ffmpeg: rework setting sub2video parameters

[Anton Khirnov <anton@khirnov.net>]

Quoting Michael Niedermayer (2023-06-07 21:17:06)
> On Wed, May 31, 2023 at 02:26:11PM +0000, Anton Khirnov wrote:
> > ffmpeg | branch: master | Anton Khirnov <anton@khirnov.net> | Tue May 23 22:54:23 2023 +0200| [20cacfe4936a8d5b643421b5ca93bb098f6b76dd] | committer: Anton Khirnov
> > 
> > fftools/ffmpeg: rework setting sub2video parameters
> > 
> > Set them in ifilter_parameters_from_dec(), similarly to audio/video
> > streams. This reduces the extent to which sub2video filters need to be
> > treated specially.
> > 
> > > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=20cacfe4936a8d5b643421b5ca93bb098f6b76dd
> > ---
> > 
> >  fftools/ffmpeg.c        |  6 ++---
> >  fftools/ffmpeg_demux.c  | 21 ++++++++++++++++++
> >  fftools/ffmpeg_filter.c | 58 +++++++++++++++----------------------------------
> >  3 files changed, 41 insertions(+), 44 deletions(-)
> 
> This breaks subtitle location and size
> 
> ./ffmpeg -i ~/tickets/4752/dump_dvbsubtitles.mp4 -y  -ss 5 -t 1 -filter_complex '[0:v][0:s]overlay' /tmp/file4752.ts && ffplay /tmp/file4752.ts
> 
> https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4752/dump_dvbsubtitles.mp4
> 
> 
> Before this commit the subtitles are centered at the bottom of the screen
> after this patch the subtitles are tiny in the left middle of the screen
> 
> In the following case the subtitles disappear completely:
> 
> ./ffmpeg -i ~/tickets/679/subtitles.ts -filter_complex '[0:v][0:s:0]overlay[vid]' -map  '[vid]' -bitexact  -t 3 file-4744-3.avi
> 
> https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4744/subtitles.ts

Should be fixed in the patchset I just sent.

Cheers,
-- 
Anton Khirnov
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