Assertion pkt failed at fftools/ffmpeg_dec.c:710 - crash when transcoding av1 (libdav1d) -> h264 (libx264)

[azhelev]

I am trying to transcode av1 (libdav1d) to h264 (libx264) video. ffmpeg terminated with SIGABRT and dumped core

Assertion pkt failed at fftools/ffmpeg_dec.c:710

How to reproduce:

$ ffmpeg -i 8c15d2570816542b10dc84df63d06cbf -vf scale=-2:234 -preset ultrafast 8c15d2570816542b10dc84df63d06cbf_avc.mp4

ffmpeg version N-114162-g2129d66a66
built on 14.03.2024

report file, gdb and valgrind output attached.

[azhelev]

gdb output

[azhelev]

valgrind output

[azhelev]

ffmpeg report log (part a)

[azhelev]

ffmpeg report log (part b)

[azhelev]

To reconstruct the ffmpeg report log archive

cat ffmpeg-20240314-163848.log.xz.parta* > ffmpeg-20240314-163848.log.xz

[James]

Can you share the input file?

Also, please test the following patch:

diff --git a/libavcodec/libdav1d.c b/libavcodec/libdav1d.c
index 597944d88d..703e14eece 100644
--- a/libavcodec/libdav1d.c
+++ b/libavcodec/libdav1d.c
@@ -375,7 +375,7 @@ static int libdav1d_receive_frame_internal(AVCodecContext *c, Dav1dPicture *p)
         } else {
             av_packet_free(&pkt);
             if (res >= 0)
-                return AVERROR(EAGAIN);
+                return 1;
         }
     }

[azhelev]

I have uploaded the file on streams.videolan.org/upload/ with this ticket number as reference.

The filename is

8c15d2570816542b10dc84df63d06cbf_crash_when_transcoding_to_h264.mp4

I also tried the patch but got the same crash.

[Steffen Roller]

I reported a similar issue in ​https://trac.ffmpeg.org/ticket/11067