Re: [FFmpeg-devel] Captions SCC

[Marth64 <marth64@proxyid.net>]

Partial reply:
FFmpeg's CC decoder is actually pretty decent for pop-on CC
but produces non-compliant ASS that needs postprocessing.

ASS can cover and render the pop-ons quite well, but the fundamental
limitation with representing EIA608 with ASS is that ASS does not
allow arbitrary positioning AND justification at the same time,
without making each line its own cue and carefully positioning the
cues or applying some other complex workarounds. The only alternative
I can think of within the ASS domain is to use heuristics to determine
numpad positioning of the caption cue and declare justification tags
without arbitrary positioning, but it needs work and will not be exact.

This is a problem for say, I want to render a cue at position x,y
but I want it also left justified at that position.

I will share details and an example in my slides.

I am personally not a fan of WebVTT but irrelevant to the advancements
I'm hoping to make. I think baby steps have to come first.

Have a good day,
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