[FFmpeg-devel] DVD subtitles
Thu Feb 28 11:48:42 CET 2008
>> IMHO it's very easy to make such a filter with the filter example
>> ("negate") as a basis, although at the moment actually I don't have a
> Actually, the negate filter read the input frame and put the negated
> frame in a new frame as output. For a hardsub filter, that would be a
> needless memcpy. It would be better to use the drawbox filter as a
> template (yes, it is not even in the SoC tree yet, I'll put it there soon).
> For doing this you should modify the avfilter framework to filter also
> subtitles (now, it only work for video but subtitle and audio is planned
> for the future). It means making CODEC_TYPE_SUBTITLE as a valid value
> for AVFilterPad.type while keeping the framework sane. That will be the
> hardest part. Then you can make a filter that has one video stream and
> one subtitle stream as input and one video stream as output.
So what you're saying is that the correct approach would be to have a
filter with two input "pads", a video input and a subtitle input. Hmmm,
looks logical to me, indeed.
Anyway, for the moment I am using a some q&d tricks to achieve my goal,
but if libav* is up for it and you're available to point me in the right
direction, I'd take on the challenge.
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