Open GoogleCodeExporter opened 9 years ago
Even vanilla tip-of-tree ffmpeg itself, used from commandline w/ libtheora and
default settings yields remarkably better results than tip-of-tree Xuggler w/
default settings and identical flv input video (using latest win32 binaries
from http://ffmpeg.arrozcru.org/autobuilds/ and libmp3lame for audio).
For starters, the output file's size is about 4 times larger when working with
vanilla ffmpeg. Even with the sameq flag enabled (and of course, without it too
- it seems to have no effect), Xuggler just doesn't detect the correct quality
settings to match the input video's quality, whereas command-line ffmpeg
detects and uses suitable settings even without enabling this flag.
Original comment by ido.dov...@gmail.com
on 26 Aug 2010 at 11:27
It seems that this issue arises from the use of bad defaults. In the
abovementioned example, ffmpeg.exe (the very version used as captive in
Xuggler) defaulted to using a constant bitrate of 200k w/ a timebase of 1/25,
whereas Xuggler defaulted to a variable bitrate w/ a timebase of 1/1000000.
Once the IStreamCoder is manually configured with the CBR settings, all is
well. So the only issue here is that the default encoder settings used by
Xuggler for Theora are pretty bad, and do not match FFMPEG's defaults.
Original comment by ido.dov...@gmail.com
on 6 Sep 2010 at 12:57
Original issue reported on code.google.com by
mondain
on 24 Aug 2010 at 5:33