avidemux vs qtdemux

[Jorge Fernandez Monteagudo]

Hi,

Thanks for the tips about tools to profiling!

I know the big time is spent in decoding and painting frames. My real pipeline
is like this

gst-launch-0.10 filesrc location=video.mp4 ! qtdemux ! ffdec_mpeg4 ! omapfbsink

or

gst-launch-0.10 filesrc location=video.avi ! avidemux ! ffdec_mpeg4 ! omapfbsink

The omapfbsink is a custom item to do the conversion in NEON and painting directly to framebuffer
but the only item I didn't thought about it, it was the qtdemux/avidemux, and that's the origin
of my question, to know the advantages using one of them, from the CPU usage point of view.

________________________________________
From: gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org [gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org] On Behalf Of Nicolas Dufresne [nicolas.dufresne at collabora.com]
Sent: Thursday, October 10, 2013 3:07 PM
To: Discussion of the development of and with GStreamer
Subject: Re: avidemux vs qtdemux

Le jeudi 10 octobre 2013 à 09:10 +0200, Jorge Fernandez Monteagudo a
écrit :
> Which is faster? I have the same video in an avi and in a mp4 file but
> the cpu usage is very similar.
> I use the next pipelines for the avi and for mp4 one.

I would be very surprised if demuxing if the bottleneck. Usually one
should profile the code to figure-out what is using the biggest amount
of CPU. There is many tool, these days I prefer the command "perf top"
but other statistic based programs could do (like oprofile).

One thing I can predict is that fbdevsink is probably doing a copy of
the video frames, ffmpegcolorspace converts in software from YUV to RGB
space. Embedded platforms usually have hardware to prevent copy and
accelerate color convertion. I would look into this, after profiling
session. Also using a hardware decoder would probably be a better idea
if available.

Nicolas


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