On 7/12/2021 4:39 PM, Michael Niedermayer wrote:
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==
Both c->frame_src and c->frame_dst need to be allocated earlier in
sws_init_context(). There seem to be some cases where that function will
return early with a success code.
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