[FFmpeg-devel] [PATCH]lavf/mxfdec: Export EIA608 Closed Captions by default
cus at passwd.hu
Sun Feb 17 02:40:50 EET 2019
On Sat, 16 Feb 2019, Carl Eugen Hoyos wrote:
> I am not sure why there is an option to disable Closed Captions export,
> but disabling the export by default seems like a bad idea to me.
SMPTE 436M can be any kind of ancillary data, not only closed captions.
That is why the default behaviour (pass all the data to userspace so a
userspace app can parse it properly) makes sense. Some applications might
depend on this.
The eia608_extract option is a hack which effectively replaces the generic
ancillary data stream with the parsed subtitle stream. The reason for the
hack is that libavcodec has no API for such a parser or filter which reads
a data stream and generates one (ore more) subtitle streams...
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