On Tue, Nov 18, 2014 at 11:13 AM, Zenny <garbytr...@gmail.com> wrote:
> Hi again:
>
> Trying to help some friends to create composite video. But when I try
> to render using a single processor, the rendering is fine, but when
> tried with multiple processors, it produces jitters as seen on the
> attachments (20s of videos respectively for comparison).
>
> Some filter (Effect in Kdenlive) is having a problem with multi-threading,
but I do not know which one. Maybe it is something related to the chroma
key. I need you to help identify the problematic filter by disabling them
one-at-a-time and making a test render. Then, I can make a change that
prevents multi-threaded access to the problematic routine. Also, let me
know which transition you are using. I doubt it is the transition; so, I
would try first disabling effects and not removing the transition. You may
not get the desired visual result with an effect disabled, but hopefully we
still observe if the problem remains or goes away.
> The script for single CPU is:
>
> #! /bin/sh
>
> SOURCE="/home/zenny/kdenlive/scripts/olle_20141115_001.sh.mlt"
> TARGET="/home/zenny/kdenlive/olle_1render.mp4"
> RENDERER="/usr/bin/kdenlive_render"
> MELT="/usr/bin/melt"
> PARAMETERS="-pid:2402 $MELT atsc_1080p_30 avformat - $SOURCE $TARGET
> properties=x264-medium g=120 crf=20 ab=160k progressive=1 threads=4
> real_time=-1"
> $RENDERER $PARAMETERS
>
> The script for multithreaded processing is:
>
> #! /bin/sh
>
> SOURCE="/home/zenny/kdenlive/scripts/olle_20141115_001.sh.mlt"
> TARGET="/home/zenny/kdenlive/olle_1render.mp4"
> RENDERER="/usr/bin/kdenlive_render"
> MELT="/usr/bin/melt"
> PARAMETERS="-pid:2402 $MELT atsc_1080p_30 avformat - $SOURCE $TARGET
> properties=x264-medium g=120 crf=20 ab=160k progressive=1 threads=4
> real_time=-4"
> $RENDERER $PARAMETERS
>
> This situation is reproduced in three occasions with different videos. Any
> help?
>
> Thanks!
>
> /z
>
>
>
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