[FFmpeg-devel] [PATCH] write AC-3 metadata
Sat Jan 1 02:52:51 CET 2011
On Fri, Dec 31, 2010 at 11:53:42AM -0500, Justin Ruggles wrote:
> On 12/31/2010 10:08 AM, Anssi Hannula wrote:
> > On 31.12.2010 15:31, Kieran Kunhya wrote:
> >>> clean effects ? This field indicates that the referenced
> >>> program element has no language.
> >>> hearing impaired ? This field indicates that the
> >>> referenced program element is prepared for the hearing
> >>> impaired.
> >>> visual_impaired_commentary ? This field indicates that the
> >>> referenced program element is prepared for the visually
> >>> impaired viewer.
> >>> [...]
> >> For what it's worth, I've never seen anyone use anything other
> >> than "undefined" for that field in MPEG-2 systems. Visual Impaired
> >> commentary uses the country code "NAR" over here in the UK.
> > Here in Finland visual impaired commentary is marked correctly using
> > that field (additionally it has the country code "hun").
> Well, since this is both codec-level and container-level information,
> there are limited options to support it.
> 1) a new field in AVCodecContext called audio_service_type
> - define FF_AUDIO_SERVICE_TYPE_AC3_COMPLETE_MAIN, etc...
> - define FF_AUDIO_SERVICE_TYPE_MPEG2LANG_CLEAN_EFFECTS, etc...
values have to bethe same between ac3 and mpeg2 for this to work
> - set the values in demuxers/decoders/muxers/encoders
> - I don't know if this would copy over when transcoding though
would require 1 line in ffmpeg.c
> 2) Move the metadata API to libavcodec
that should be done anyway one day ...
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
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even the very wise cannot see all ends. -- Gandalf
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