#1482: FFMPEG fails to create a SRT file when extracting Subtitles
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Reporter: ramitbhalla | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: cc | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by pross):
@cehoyos
samples/ffmpeg-bugs/trac/ticket1065/Test1.wtv contains
mediatype_mstvcaption packets
Currently FFmpeg interprets both 'mediatype_mstvcaption' and
'mediasubtype_dtvccdata' as AVCODEC_ID_DVB_TELETEXT (see extract from
wtvdec.c below). That now looks to be wrong.
mediasubtype_dtvccdata is a variant of CEA-708.
mediatype_mstvcaption is something different again. Another proprietary
format, perhaps.
---wtvdec.c
} else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
!ff_guidcmp(subtype, mediasubtype_dtvccdata)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
if (!st)
return NULL;
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown
formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
return st;
---wtvdec.c
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1482#comment:22>
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