avdec_h264 and output-corrupt

[Peter Randeu]

Hello everyone,

Doing some experiments with avdec_h264 (Debian Gstreamer packages
version 1.8.3-1) and packet loss, I am wondering what the
"output-corrupt" property of avdec_h264 does?

I have the following test pipe:

gst-launch-1.0 \
  videotestsrc pattern=ball is-live=true ! \
  x264enc bitrate=2048 key-int-max=60 ! \
  video/x-h264,profile=baseline ! \
  identity drop-probability=0.05 ! \
  h264parse ! \
  avdec_h264 output-corrupt=false ! \
  xvimagesink \
  --gst-debug=*av*:9 2>&1 | grep corrupt

No matter how I set "output-corrupt", corrupt frames are always
displayed. According to the debug output, avdec_h264 never detects a
corrupt frame and always prints:
libav gstavviddec.c:1381:gst_ffmpegviddec_video_frame:<avdec_h264-0>
corrupted frame: 0

Is that behavior intended?
Is there another way to detect incorrect decoded frames?

Thanks,
Peter
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[Sebastian Dröge-3]

On Mon, 2016-10-17 at 09:38 +0200, Peter Randeu wrote:
>
> No matter how I set "output-corrupt", corrupt frames are always 
> displayed. According to the debug output, avdec_h264 never detects a 
> corrupt frame and always prints:
> libav gstavviddec.c:1381:gst_ffmpegviddec_video_frame:<avdec_h264-0> 
> corrupted frame: 0
>
> Is that behavior intended?
> Is there another way to detect incorrect decoded frames?

There was a bug in various ffmpeg versions that made it never signal
frames as corrupt. Version 3.0 and newer should have that though.

Is that what you're using, or an older one?

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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[Peter Randeu]

On Tue, 18 Oct 2016 13:26:20 +0300, Sebastian Dröge wrote:
> On Mon, 2016-10-17 at 09:38 +0200, Peter Randeu wrote:
>>
>> No matter how I set "output-corrupt", corrupt frames are always
>> displayed.
>
> There was a bug in various ffmpeg versions that made it never signal
> frames as corrupt. Version 3.0 and newer should have that though.
>
> Is that what you're using, or an older one?

I am using the current Debian/testing version of GStreamer which is
1.8.3-1. Gstreamer1.0-libav depends on the following packages:
libavcodec57, libavfilter6, libavformat57, libavutil55
They are all on version 3.1.4 (Debian package version 7:3.1.4-1) which
seems to be the latest stable release.

I have also recompiled the Debian package of gst-libav so that is does
not use the system libav but the version included in the gst-libav
sources. But that had no influence on the behavior of "output-corrupt".

Peter
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