[FFmpeg-devel] [PATCH 6/8] lavfi/vf_scale: convert to the frame-based sws API

[Michael Niedermayer]

On Mon, Jul 12, 2021 at 01:07:07PM +0200, Anton Khirnov wrote:
> ---
>  libavfilter/vf_scale.c | 73 ++++++++++++++++++++++++++++--------------
>  1 file changed, 49 insertions(+), 24 deletions(-)

crashes:

 ./ffmpeg  -i ~/tickets/5264/gbrap16.tif -vf format=yuva444p,scale=alphablend=checkerboard,format=yuv420p -y file.png

 Stream mapping:
  Stream #0:0 -> #0:0 (tiff (native) -> png (native))
Press [q] to stop, [?] for help
==19419== Invalid read of size 4
==19419==    at 0x1223964: av_frame_ref (frame.c:330)
==19419==    by 0x1190B34: sws_frame_start (swscale.c:1069)
==19419==    by 0x1190EA4: sws_scale_frame (swscale.c:1153)
==19419==    by 0x3E7493: scale_frame (vf_scale.c:821)
==19419==    by 0x3E752D: filter_frame (vf_scale.c:837)
==19419==    by 0x29B314: ff_filter_frame_framed (avfilter.c:969)
==19419==    by 0x29BBCF: ff_filter_frame_to_filter (avfilter.c:1117)
==19419==    by 0x29BDDF: ff_filter_activate_default (avfilter.c:1166)
==19419==    by 0x29C003: ff_filter_activate (avfilter.c:1324)
==19419==    by 0x2A0EBB: ff_filter_graph_run_once (avfiltergraph.c:1400)
==19419==    by 0x2A2139: push_frame (buffersrc.c:157)
==19419==    by 0x2A26B6: av_buffersrc_add_frame_flags (buffersrc.c:225)
==19419==    by 0x24FC90: ifilter_send_frame (ffmpeg.c:2241)
==19419==    by 0x24FF72: send_frame_to_filters (ffmpeg.c:2315)
==19419==    by 0x250D26: decode_video (ffmpeg.c:2512)
==19419==    by 0x2517BA: process_input_packet (ffmpeg.c:2674)
==19419==    by 0x25799F: process_input (ffmpeg.c:4403)
==19419==    by 0x2599A4: transcode_step (ffmpeg.c:4758)
==19419==    by 0x259B0C: transcode (ffmpeg.c:4812)
==19419==    by 0x25A470: main (ffmpeg.c:5017)
==19419==  Address 0x68 is not stack'd, malloc'd or (recently) free'd
==19419== 
==19419== 
 

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

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <https://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20210712/ab2bf6c9/attachment.sig>