[FFmpeg-user] worth to bother? create a set of test video clips for mobile devices
zhangweiwu at realss.com
Thu Feb 2 02:19:42 CET 2012
? 2012?01?31? 16:10, Zhang Weiwu ??:
> I just think, since I wish to produce the test clips anyway, why not
> publish all test clips on a website so that others can download them and
> use them to aid their testing on their mobile phones? I can imagine
> needing to produce a matrix of clips at different qscale, framerate and
Hello all. As promised I made a script for this test, using ffmpeg from
debian-multimedia.org instead of the shipped version.
Consider the video variables, there are the following:
1. VBR or CBR
4. quality (qscale) or bitrate
Limited mpeg4 tests show the last variable is not relevant to device
tests: I produced different clips at different -qscale and -b. It's hard
to tell the CPU usage of one from other, they are all very similar. So I
only produced matrix of the first 3 variables.
It's very easy to use: just place it in some directory and run "make"
there (only gnumake tested). The script produces 74 test clips in a new
directory hierarchy like this:
A tester should enter the 'cases' directory, play back one of the test
video clip, and depend on the result, choose a sub-directory to enter,
and play the clips there; depending on the result, choose a subdirectory
to enter again, this 3-rd level has all the rest of test clips.
Took me a whole fine day! It's the very first Makefile script I ever
wrote, so I am sure it is far from perfect. But I'd like to have a
chance of getting it commented before I further polish it so that I know
I am on the right track. Thanks. The premature script is in the
attachment, it worked for me.
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