Opened 2 years ago

Closed 2 years ago

#5647 closed defect (needs_more_info)

video freeze with continuos error : cabac decode of qscale diff failed

Reported by: gentian Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

I am having errors on ffmpeg when transrating a Multicast/UDP stream from HD 1920x1080 to 720x576 profile and outputing again to multicast:

./ffmpeg -loglevel error -i udp://@234.2.2.1:1234?fifo_size=500000&buffer_size=100000&overrun_nonfatal=1 -c:v libx264 -preset fast -s 720x576 -bsf:v h264_mp4toannexb -profile:v high -sn -flush_packets 0 -f mpegts udp://@234.2.2.2:1234?ttl=3&localaddr=10.100.50.66&pkt_size=1316

After 1 days or sometimes 2 days, very randomly video freezes with half image blurred/distorted and freezed while sound is ok. on the console i see this errors every second, like it enters a loop. I need to restart and the process assume fine for another day. CPU and MEM of the process are ok.

[h264 @ 0xbdcbae0] error while decoding MB 98 35, bytestream 16242
[h264 @ 0xb3c8a00] Reference 5 >= 4
[h264 @ 0xb3c8a00] error while decoding MB 54 14, bytestream 21837
[h264 @ 0xc7e5ce0] cabac decode of qscale diff failed at 54 34
[h264 @ 0xc7e5ce0] error while decoding MB 54 34, bytestream 10772
[h264 @ 0xb3c8a00] Reference 2 >= 2
[h264 @ 0xb3c8a00] error while decoding MB 73 56, bytestream 1577
[h264 @ 0xb3c8a00] Reference 4 >= 4
[h264 @ 0xb3c8a00] error while decoding MB 44 22, bytestream 42118
[h264 @ 0x81ecf80] Reference 2 >= 2
[h264 @ 0x81ecf80] error while decoding MB 16 15, bytestream 10029

I have seen same problem opened from another user on Libav bug tracker: https://bugzilla.libav.org/show_bug.cgi?id=920

Change History (2)

comment:1 Changed 2 years ago by cehoyos

Please provide the command line that allows to reproduce this issue together with the complete, uncut console output to make this a valid ticket, don't forget to test current FFmpeg git head.

comment:2 Changed 2 years ago by cehoyos

  • Resolution set to needs_more_info
  • Status changed from new to closed

Please reopen this ticket if you can add the missing information.

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