> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of
> Marth64
> Sent: Sunday, February 9, 2025 8:38 PM
> To: FFmpeg development discussions and patches <ffmpeg-
> de...@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] Captions SCC
>
> 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.
Numpad alignment 7, LeftMargin=x VertMargin=y
sw
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