The "real-time" property is documented
here:https://www.mltframework.org/bin/view/MLT/ConsumerAvformat#real_time
Syntax:melt edl.xml -consumer avformat:out.mp4 realtime=-4
The real time property is really two properties in one. Positive and negative
specifies whether frames should be dropped or not (respectively).
The reason one might drop frames would be in real-time applications where it is
more valuable to keep displaying pictures than to actually display every
picture. If you are watching a video, for example, it might be less distracting
to drop every 5th frame than to have the video constantly pausing.
For file based processing and any non-real-time applications, you want to use a
negative number so that frames are not dropped.
Tip: using more than one processing thread may expose a bug in a filter. If you
see strange behavior, try setting real-time to 0 and see if the problem goes
away.
The "threads" property is documented
here:https://www.mltframework.org/bin/view/MLT/ConsumerAvformat#threads
Syntax:melt edl.xml -consumer avformat:out.mp4 threads=4
This will tell the encoder how many threads to use for encoding.
The two properties can be combined:melt edl.xml -consumer avformat:out.mp4
realtime=-4 threads=4
I typically set the values to be equal to the number of logical cores
available. So "-4" and "4" respectively would be a good way to maximize your
machine.
~BM
From: jeffrey k eliasen <j...@jke.net>
To: Dan Dennedy <d...@dennedy.org>
Cc: mlt-devel@lists.sourceforge.net
Sent: Thursday, June 16, 2016 6:40 PM
Subject: Re: [Mlt-devel] Optimizing `melt` in a CPU-intensive environment
OK, so if I'm reading this properly, I should do something like:
melt edl.xml -consumer avformat:out.mp4 real_time:4
... to get specify 4 cores with frame-dropping?
Also, what is frame dropping?
#yiv3598955513 .yiv3598955513ExternalClass * {line-height:100%;}
----------
jeffrey k eliasen - technologist, philosopher, agent of change
blog |linkedin |google+ |facebook |twitter
On Jun 16, 2016, at 13:30, Dan Dennedy <d...@dennedy.org> wrote:
https://www.mltframework.org/bin/view/MLT/Questions#Does_MLT_take_advantage_of_multi
On Thu, Jun 16, 2016 at 4:29 PM jeffrey k eliasen <j...@jke.net> wrote:
I am running the melt command on a 4-core system with no other software running
(except system services), and I am only seeing about 30% CPU usage (134% of the
theoretical 400% on the box). ffmpeg and other commands are fully utilizing the
cores (380-410%), so the power is definitely available. All the files are being
read from tempfs (RAM-based disk), so while there is definitely some latency
for file access it should not be significant compared to the same media stored
on physical media.
Is melt able to utilize multiple processors? If so, why is it only using about
1.5 CPUs of the available 4? Are there settings I can adjust to better utilize
the host machine?
----------
jeffrey k eliasen - technologist, philosopher, agent of change
blog |linkedin |google+ |facebook |twitter
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