[FFmpeg-devel] [PATCH v5 00/25] Subtitle Filtering 2022

[Paul B Mahol]

On Fri, Aug 12, 2022 at 12:51 AM Soft Works <softworkz at hotmail.com> wrote:

>
>
> > -----Original Message-----
> > From: ffmpegagent <ffmpegagent at gmail.com>
> > Sent: Saturday, June 25, 2022 11:58 AM
> > To: ffmpeg-devel at ffmpeg.org
> > Cc: Michael Niedermayer <michael at niedermayer.cc>; Andreas Rheinhardt
> > <andreas.rheinhardt at outlook.com>; Soft Works <softworkz at hotmail.com>;
> > Andriy Gelman <andriy.gelman at gmail.com>; softworkz
> > <softworkz at hotmail.com>
> > Subject: [PATCH v5 00/25] Subtitle Filtering 2022
> >
> >
> > Subtitle Filtering 2022
> > =======================
> >
> > This is a substantial update to the earlier subtitle filtering patch
> > series.
> > A primary goal has been to address others' concerns as much as
> > possible on
> > one side and to provide more clarity and control over the way things
> > are
> > working. Clarity is is specifically important to allow for a better
> > understanding of the need for a subtitle start pts value that can be
> > different from the frame's pts value. This is done by refactoring the
> > subtitle timing fields in AVFrame, adding a frame field to indicate
> > repeated
> > subtitle frames, and finally the full removal of the heartbeat
> > functionality, replaced by a new 'subfeed' filter that provides
> > different
> > modes for arbitrating subtitle frames in a filter graph. Finally,
> > each
> > subtitle filter's documentation has been amended by a section
> > describing the
> > filter's timeline behavior (in v3 update).
> >
> >
> > Subtitle Filtering Demos
> > ========================
> >
> > I published a demonstration of subtitle filtering capabilities with
> > OCR,
> > text and bitmap subtitle manipulation involved: Demo 1: Text-
> > Manipulation
> > with Bitmap Subtitles
> > [https://github.com/softworkz/SubtitleFilteringDemos/tree/master/Demo
> > 1]
>
>
> As there were no objections in any regard, I hope that we could make
> some progress regarding subtitle filtering soon.
>
> The only recent statement that has been made was something like
>
> "this may work in a limited number of cases but probably won't be
> capable to work for the whole range of real-life situations"
>
> I understand how easily such statements can induce doubt into the
> audience, even on those who tend and try to be neutral in their
> assessments. I also think that replying once another time with
> something like "no, this isn't true" won't be much impressive.
>
>
> Instead, I'm sharing a video with you, documenting my internal
> test runs for text subtitle overlay (with and without subtitle
> filtering, with and without hw overlay, with a range of hw accelerations
> for encoding and decoding, scaling or no scaling and two different
> kinds of source files).
>
> The diagrams at the right are a rather consumer focused, but still
> accurate. Just hwupload/download/hwmap are omitted and implied
> by the data changing the "swim lanes".
>
> https://github.com/softworkz/SubtitleFilteringDemos/tree/master/TestRun1
>
> Commands and logs on request.
>
>
We should more forward and merge this considerable subtitle work instead of
waiting for broken promises from other inactive developers.


> Best wishes,
> softworkz
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