[FFmpeg-trac] #11455(undetermined:new): Degradation in Closed Captions decoding

[FFmpeg]

#11455: Degradation in Closed Captions decoding
-------------------------------------+-------------------------------------
             Reporter:  ValeryKot    |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by ValeryKot:

Old description:

> Summary of the bug: in some cases, FFmpeg fails to extract Closed
> Captions (A/53 Part 4 format). This is a degradation: same file can be
> processed correctly with FFmpeg 4.0, but also with VLC.
> How to reproduce:
> {{{
> % ffmpeg.EXE" -f lavfi -report -i "movie=CC720p60_10sec.mp4[out+subcc]"
> -map 0:1 output_10sec.srt
> ffmpeg version N-118422-g1fbe9deee3-20250204
> built on 2025-02-04 17:56
> }}}
> Relevant error is:
>
> {{{
> [Closed Captions Decoder @ 000002f8b063dec0] Data ignored due to columns
> exceeding screen width.
> }}}
> I will (try to) attach original file, and reports and output by latest
> master and by 4.0

New description:

 Summary of the bug: in some cases, FFmpeg fails to extract Closed Captions
 (A/53 Part 4 format). This is a degradation: same file can be processed
 correctly with FFmpeg 4.0, but also with VLC.
 How to reproduce:
 {{{
 % ffmpeg.EXE -f lavfi -report -i "movie=CC720p60_10sec.mp4[out+subcc]"
 -map 0:1 output_10sec.srt
 ffmpeg version N-118422-g1fbe9deee3-20250204
 built on 2025-02-04 17:56
 }}}
 Relevant error is:

 {{{
 [Closed Captions Decoder @ 000002f8b063dec0] Data ignored due to columns
 exceeding screen width.
 }}}
 I will (try to) attach original file, and reports and output by latest
 master and by 4.0

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Ticket URL: <https://trac.ffmpeg.org/ticket/11455#comment:2>
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