[x264-devel] Bug with flashing scene

[David Mackenzie]

Hi x264 devs,

I'm encoding some animated content, and this scene produces some very bad
distortion on the output during a sequence where the screen flashes black
and white (frame 55).

You can grab the source file (UTvideo AVI format) and the x264 encode
showing the problem here:

http://mab.to/fr5KCBOTJ

I've tried this on several different software players, it doesn't seem to
be a bug in the decoders (all replicate it exactly). Have yet to burn it to
disc and try it on a set-top player though.

Forcing the affected frame to be an I-frame (with "K -1" in the QPfile)
does work around the error.

Command line used:

x264.exe --aq-strength 0.4 --bitrate 30000 --preset veryslow --tune film
--bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1
--keyint 24 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709"
--colormatrix "bt709" --sar 1:1 --qpfile
"c:\autovenc\tickets\inprog\scherzo_inferna.avs_ticket.chaps" --stats
"c:\autovenc\tickets\inprog\scherzo_inferna.avs_ticket.stats" --pass 1 -o
"G:\Authoring\xxx\D1_Shorts\Asset\secondBatch\scherzo_inferna_bug.avc"
"f:\scherzo_inferna.avs"


Thanks as always for your work on this outstanding encoder.

-- 
-- 
David Mackenzie
DVD / Blu-ray Compression & Authoring
AV Calibration and Consulting
ISF Certified Calibrator

US: +1 914-902-8928
UK: +44 (0) 203-239-6816
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