[FFmpeg-trac] #11357(avcodec:new): H.264 decoder bug on Arm

[FFmpeg]

#11357: H.264 decoder bug on Arm
--------------------------------------+-----------------------------------
             Reporter:  Bin Peng      |                    Owner:  (none)
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  H264 decoder  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+-----------------------------------
Description changed by Bin Peng:

Old description:

> Summary of the bug:
>
> When decoding a bitstream with weightb=2 enabled, the output of FFmpeg on
> ARM and x86 platforms may differ.
>

> How to reproduce:
> {{{
> using ffmpeg git-master built on aarch64 and test on aarch64 devices
> % ffmpeg -i inter_weighted_bipred2.264 -f framemd5 -y md5_arm
>
> using ffmpeg git-master built on x86 and test on x86 devices
> % ffmpeg -i inter_weighted_bipred2.264 -f framemd5 -y md5_x86
>
> md5_arm and md5_x86 would be different, but we expect the same decode
> result
> on different CPUs with the same input bit-stream.
> }}}

New description:

 Summary of the bug:

 When decoding a bitstream with weighted-bipred enabled, the output of
 FFmpeg on ARM and x86 platforms may differ.


 How to reproduce:
 {{{
 using ffmpeg git-master built on aarch64 and test on aarch64 devices
 % ffmpeg -i inter_weighted_bipred2.264 -f framemd5 -y md5_arm

 using ffmpeg git-master built on x86 and test on x86 devices
 % ffmpeg -i inter_weighted_bipred2.264 -f framemd5 -y md5_x86

 md5_arm and md5_x86 would be different, but we expect the same decode
 result
 on different CPUs with the same input bit-stream.
 }}}

--
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11357#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker