[FFmpeg-devel] [PATCH v2 03/15] avfilter: add negotiation API for color space/range

[Michael Niedermayer]

On Wed, Dec 13, 2023 at 02:12:00PM +0100, Niklas Haas wrote:
> From: Niklas Haas <git at haasn.dev>
> 
> Motivated by YUVJ removal. This change will allow full negotiation
> between color ranges and matrices as needed. By default, all ranges and
> matrices are marked as supported.
> 
> Because grayscale formats are currently handled very inconsistently (and
> in particular, assumed as forced full-range by swscale), we exclude them
> from negotiation altogether for the time being, to get this API merged.
> 
> After filter negotiation is available, we can relax the
> grayscale-is-forced-jpeg restriction again, when it will be more
> feasible to do so without breaking a million test cases.
> 
> Note that this commit updates one FATE test as a consequence of the
> sanity fallback for non-YUV formats. In particular, the test case now
> writes rgb24(pc, gbr/unspecified/unspecified) to the matroska file,
> instead of rgb24(unspecified/unspecified/unspecified) as before.
> ---
>  doc/APIchanges              |   3 +
>  libavfilter/avfilter.c      |  17 +++-
>  libavfilter/avfilter.h      |  28 ++++++
>  libavfilter/avfiltergraph.c | 173 +++++++++++++++++++++++++++++++++++-
>  libavfilter/formats.c       | 122 ++++++++++++++++++++++++-
>  libavfilter/formats.h       |  54 +++++++++++
>  libavfilter/internal.h      |   6 ++
>  libavfilter/vaapi_vpp.c     |   4 +
>  libavfilter/video.c         |   2 +
>  tests/ref/fate/shortest-sub |   4 +-
>  10 files changed, 404 insertions(+), 9 deletions(-)

segfaults

./ffmpeg -f lavfi -i "amovie=fate-suite/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv,asplit=3[out1][a][b]; [a]showwaves=s=340x240,pad=iw:ih*2[waves]; [b]showspectrum=s=340x240[spectrum]; [waves][spectrum] overlay=0:h [out0]"  -t 0.1 -qscale 2 -bitexact /tmp/file-waves.avi

Thread 1 "ffmpeg_g" received signal SIGSEGV, Segmentation fault.
0x00005555557a7c07 in query_formats ()
(gdb) bt
#0  0x00005555557a7c07 in query_formats ()
#1  0x00005555557a84d5 in avfilter_graph_config ()
#2  0x000055555569ac0a in lavfi_read_header ()
#3  0x0000555555a7bd61 in avformat_open_input ()
#4  0x000055555574cb43 in ifile_open ()
#5  0x0000555555763c49 in open_files.isra ()
#6  0x0000555555765327 in ffmpeg_parse_options ()
#7  0x00005555557442b4 in main ()

(i can provide better backtrace if you cannot reproduce ...)

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I have often repented speaking, but never of holding my tongue.
-- Xenocrates
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