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[SOLVED] Wrong contrast using KDEnlive rendering

Posted: Sat Aug 19, 2017 5:39 am
by Bartoloni
i searched the web and finally i found that the "YUVJ to YUV" issue was adressed 6 years ago... ( )
i'm experiencing the same issue...
here an output of 2 rendering ( MPEG4 DIVX ... and WMV )

MPG4 --> properties=MPEG-4-ASP qscale=%quality aq=%audioquality'
WMV --> f=asf vcodec=wmv2 acodec=wmav2 qscale=%quality aq=%audioquality

this is the result (UP from DOWN ... ORIGINAL - DIVX - WMV)

Re: Wrong contrast using KDEnlive

Posted: Sun Nov 05, 2017 10:33 am
by Bartoloni
this is an updated thread about the issue on YUV videos:

and a new image with latest FFMPEG (but this is a MELT issue or a FFMPEG issue?)


and these are the media informations:

Re: [SOLVED] Wrong contrast using KDEnlive rendering

Posted: Tue Nov 07, 2017 9:04 pm
by Bartoloni
i was very sceptical about this issue... some guys are reporting strange contrast errors... others nothing... a lot of time BUG reports are closed by an "UNCONFIRMED" ... or "INVALID"

well .. today i tried to replace the VGA CARD... (very very stupid idea right?) ... i have replaced the GT9500 with a GT610...
reopened the same project on Kdenlive... and now.. (without any YUV parameter passed to MELT) the rendering is ok.

no idea about what's happening on renderings... but the issue are the video drivers (or VGA architecture) ... this can explain why some users have issues on Android... or iOs... and developers can't see the BUG...

i hope this solve (for users) the "YUV ACCIDENT" (finally)...

P.S. now maybe is time to understand what happens on rendering (and YUV) during rendering on different VGA cards.