[FFmpeg-trac] #4360(undetermined:new): -mbd 0 causes artifacts when encoding a specific video to MPEG-1
FFmpeg
trac at avcodec.org
Sun Mar 8 20:17:05 CET 2015
#4360: -mbd 0 causes artifacts when encoding a specific video to MPEG-1
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Reporter: ejlasota | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
A specific sample video experiences heavy artifacts when transcoded to
MPEG-1 video using -mbd 0 (or leaving it as default), even at very high
bit rates. -q:v 1 increases the severity.
How to reproduce:
Download this video:
http://trailers.divx.com/divx_prod/profiles/Micayala_DivX1080p_ASP.divx
Run this (used Zoranoe git-9d7e42e 64-bit static build)
{{{
% ffmpeg -i Micayala_DivX1080p_ASP.divx -b:v 30000k -bf 5 -report -y
artifacts.m1v
}}}
Notice artifacts on the DivX logo animations and both the start and end of
the video.
Changing -b:v to 5000k or 30000k did not have any effect. -q:v 1
increased the severity. The problem does not occur when using -mbd 1 or
-mbd 2.
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Ticket URL: <https://trac.ffmpeg.org/ticket/4360>
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