Re: [FFmpeg-devel] [PATCH v5 24/25] fftools/ffmpeg: Introduce subtitle filtering and new frame-based subtitle encoding

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Michael Niedermayer:
> On Sat, Jun 25, 2022 at 09:57:56AM +0000, softworkz wrote:
>> From: softworkz <softworkz@hotmail.com>
>>
>> This commit actually enables subtitle filtering in ffmpeg by
>> sending and receiving subtitle frames to and from a filtergraph.
>>
>> The heartbeat functionality from the previous sub2video implementation
>> is removed and now provided by the 'subfeed' filter.
>> The other part of sub2video functionality is retained by
>> auto-insertion of the new graphicsub2video filter.
>>
>> Justification for changed test refs:
>>
>> - sub2video
>>   The previous results were incorrect. The command line for this test
>>   specifies -r 5 (5 frames per second), which is now fulfilled by the
>>   additional frames in the reference output.
>>   Example: The first subtitle time is 499000, the second is 15355000,
>>   which means 0.5s and 15.35s with a difference of 14.85s.
>>   15s * 5fps = 75 frames and that's now the exact number of video
>>   frames between these two subtitle events.
>>
>> - sub2video_basic
>>   The previous results had some incorrect output because multiple
>>   frames had the same dts
>>   The non-empty content frames are visually identical, the different
>>   CRC is due to the different blending algorithm that is being used.
>>
>> - sub2video_time_limited
>>   Subtitle frames are emitted to the filter graphs at a 5 fps rate
>>   by default. The time limit for this test is 15s * 5fps = 75 frames
>>   which matches the count in the new ref.
>>
>> - sub-dvb
>>   Running ffprobe -show_frames on the source file shows that there
>>   are 7 subtitle frames with 0 rects in the source at the start
>>   and 2 at the end. This translates to the 14 and 4 additional
>>   entries in the new test results.
>>
>> - filter-overlay-dvdsub-2397
>>   Overlay results have slightly different CRCs due to different
>>   blending implementation
>>
>> - sub-scc
>>   The first entry is no longer in the output because it is before
>>   the actual start time and the strim filter removes such entries
>>   now (like for video and audio)
>>
>> Signed-off-by: softworkz <softworkz@hotmail.com>
>> ---
>>  fftools/ffmpeg.c                          |  613 +++++-----
>>  fftools/ffmpeg.h                          |   17 +-
>>  fftools/ffmpeg_filter.c                   |  270 +++--
>>  fftools/ffmpeg_hw.c                       |    2 +-
>>  fftools/ffmpeg_opt.c                      |   28 +-
>>  tests/ref/fate/filter-overlay-dvdsub-2397 |  182 +--
>>  tests/ref/fate/sub-dvb                    |  162 +--
>>  tests/ref/fate/sub-scc                    |    1 -
>>  tests/ref/fate/sub2video                  | 1091 +++++++++++++++++-
>>  tests/ref/fate/sub2video_basic            | 1238 +++++++++++++++++++--
>>  tests/ref/fate/sub2video_time_limited     |   78 +-
>>  11 files changed, 3010 insertions(+), 672 deletions(-)
> 
> seems to break fate
> 
> Input #0, ass, from 'fate-suite//sub/1ededcbd7b.ass':
>   Duration: N/A, bitrate: N/A
>   Stream #0:0: Subtitle: ass
> Codec AVOption threads (set the number of threads) specified for input file #0 (fate-suite//sub/1ededcbd7b.ass) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
> Codec AVOption thread_type (select multithreading type) specified for input file #0 (fate-suite//sub/1ededcbd7b.ass) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
> Stream mapping:
>   Stream #0:0 -> #0:0 (ass (ssa) -> ass (ssa))
> cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
> subtitle input filter: decoding size 1280x720
> [out_0_0 @ 0x557cab64bbc0] Subtitle format change from 1 to 3
> Assertion c > 0 failed at libavutil/mathematics.c:61

That's an av_assert2-assert. softworkz probably didn't test these.

> Aborted (core dumped)
> tests/Makefile:304: recipe for target 'fate-sub-ass-to-ass-transcode' failed
> make: *** [fate-sub-ass-to-ass-transcode] Error 134
> 
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