#11684: mxfenc mxf_opatom with only vbi_vanc_smpte_436M data stream assertion error -------------------------------------+------------------------------------- Reporter: Jacob | Type: defect Lifshay | Status: new | Priority: normal Component: avformat | Version: git- | master Keywords: mxf_opatom | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: muxing only the vbi_vanc_smpte_436M data stream from the provided .mxf file into a mxf_opatom file causes an assertion error: How to reproduce: {{{ % gdb -q --batch -ex run -ex bt --args ./ffmpeg-git_g -v 9 -loglevel 99 -nostats -nostdin -y -i mxf_vanc_causes_opatom_bug.mxf -map 0:1 -f mxf_opatom /tmp/out.mxf [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". ffmpeg version N-120374-ge29016a9de Copyright (c) 2000-2025 the FFmpeg developers built with gcc 12 (Debian 12.2.0-14+deb12u1) configuration: --optflags=-O0 --assert-level=2 --disable-shared --enable-static --progs-suffix=-git --enable-sdl2 --enable-libx264 --enable-gpl --enable-libklvanc libavutil 60. 6.100 / 60. 6.100 libavcodec 62. 8.100 / 62. 8.100 libavformat 62. 1.103 / 62. 1.103 libavdevice 62. 0.100 / 62. 0.100 libavfilter 11. 3.100 / 11. 3.100 libswscale 9. 0.100 / 9. 0.100 libswresample 6. 0.100 / 6. 0.100 Splitting the commandline. <snip> [in#0/mxf @ 0x555558de7680] EOF while reading input [out#0/mxf_opatom @ 0x555558e2e280] All streams finished [out#0/mxf_opatom @ 0x555558e2e280] Terminating thread with return code 0 (success) [in#0/mxf @ 0x555558de7680] Terminating thread with return code 0 (success) [mxf_opatom @ 0x555558e2e3c0] essence container count:1 [mxf_opatom @ 0x555558e2e3c0] edit units count 4369 Assertion b>=-128 && b<=255 failed at libavformat/aviobuf.c:181 [Thread 0x7ffff73be6c0 (LWP 52538) exited] [Thread 0x7fffeffff6c0 (LWP 52539) exited] Thread 1 "ffmpeg-git_g" received signal SIGABRT, Aborted. __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44 44 ./nptl/pthread_kill.c: No such file or directory. #0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44 #1 0x00007ffff76a9f4f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78 #2 0x00007ffff765afb2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26 #3 0x00007ffff7645472 in __GI_abort () at ./stdlib/abort.c:79 #4 0x0000555555c172c8 in avio_w8 (s=0x555558e45300, b=256) at libavformat/aviobuf.c:181 #5 0x0000555555c18128 in avio_wb16 (s=0x555558e45300, val=65543) at libavformat/aviobuf.c:445 #6 0x0000555555d60d91 in mxf_write_local_tag (s=0x555558e2e3c0, size=65543, tag=16138) at libavformat/mxfenc.c:681 #7 0x0000555555d6531e in mxf_write_index_table_segment (s=0x555558e2e3c0) at libavformat/mxfenc.c:2075 #8 0x0000555555d6a9d8 in mxf_write_footer (s=0x555558e2e3c0) at libavformat/mxfenc.c:3458 #9 0x0000555555d4f75f in av_write_trailer (s=0x555558e2e3c0) at libavformat/mux.c:1262 #10 0x000055555569ce8b in of_write_trailer (of=0x555558e2e280) at fftools/ffmpeg_mux.c:770 #11 0x00005555556d1ef0 in transcode (sch=0x555558de7380) at fftools/ffmpeg.c:907 #12 0x00005555556d21b9 in main (argc=15, argv=0x7fffffffdca8) at fftools/ffmpeg.c:1009 }}} Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker. -- Ticket URL: <https://trac.ffmpeg.org/ticket/11684> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker