[FFmpeg-devel] Killing ASS timings in AVSubtitle ass text field

[Clément Bœsch]

[PATCH 1/6] Kill timed SSA

This one is an old patch, which kills the usage of the old and unused
AV_CODEC_ID_SSA

[PATCH 2/6] lavc: allow subtitle text format to be ASS without timing

The big commit. Text based decoders do not have to rescale and insert the
timing in the ASS text anymore. A compatibility function
(convert_sub_to_old_ass_form()) is used to actually re-insert them. After this
commit, you can get clean AVSubtitle by setting sub_text_format=ass in decoder
context.

[PATCH 3/6] lavc/options: add ass_ro_flush_noop to flags2

Apparently, mpv do not want to reset the ReadOrder of the decoded subtitles on
flush. This addition of this option makes it possible.

[PATCH 4/6] ffmpeg: set sub_text_format to ass (without timing) by default

Make use of the newly introduced option. The nice side effect is that it fixes
all kind of long standing timing inaccuracy issues.

[PATCH 5/6] lavfi/ass: use ass_process_chunk() instead of ass_process_data()

libass has been willing to drop this since a long time...

[PATCH 6/6] lavc: deprecate decoded ass subtitles with timings

And the final deprecation to kill that code automatically at next major bump.
Compilation and FATE tested when set to 0.