theora - Jan 2008 - Drop Frames

Hi,

When i change the dropframe_p variable into greter than 0 value i can get a
encoded video with high compression. what will happen in this case ?

-- 
___
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.xiph.org/pipermail/theora/attachments/20080122/91218878/attachment.htm

Hi,

Last night I encoded a movie at a variety of different bitrates:

ffmpeg2theora-0.20.exe -V 300 1am_zzzz01a.avi -o v300.ogg
ffmpeg2theora-0.20.exe -V 50 1am_zzzz01a.avi -o v50.ogg
ffmpeg2theora-0.20.exe -V 100 1am_zzzz01a.avi -o v100.ogg
ffmpeg2theora-0.20.exe -V 200 1am_zzzz01a.avi -o v200.ogg
ffmpeg2theora-0.20.exe -V 400 1am_zzzz01a.avi -o v400.ogg
ffmpeg2theora-0.20.exe -V 500 1am_zzzz01a.avi -o v500.ogg

The source is a 20GB 4 minute 15 second uncompressed avi (1280x720) with 
no sound.


21/01/2008  18:37        32,412,109 v300.ogg
21/01/2008  19:21        32,199,484 v50.ogg
21/01/2008  20:05        32,257,144 v100.ogg
21/01/2008  20:55        32,318,099 v200.ogg
21/01/2008  21:39        32,586,514 v400.ogg
21/01/2008  22:23        32,942,370 v500.ogg

..why is there so little blessed difference between the file sizes?



My player reports:

v50.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=50000 quality=0 pixfmt=4:2:0

v100.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=100000 quality=0 pixfmt=4:2:0

v200.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=200000 quality=0 pixfmt=4:2:0

v300.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=300000 quality=0 pixfmt=4:2:0

v400.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=400000 quality=0 pixfmt=4:2:0

v500.ogg THEORA pwh=1280x720 fps=30.00 fwh=1280x720 ofsxy=0x0 
bitrate=500000 quality=0 pixfmt=4:2:0

..but according to the file sizes, they all have a bitrate of about 253 
kbps - what am I missing here?


Thanks

- Patrick

On Tue, Jan 22, 2008 at 4:59 AM, Patrick Byrne <pbyrne@frontier.co.uk>
wrote:
> Hi,
>
>  Last night I encoded a movie at a variety of different bitrates:
[...]
>  ..but according to the file sizes, they all have a bitrate of about 253
>  kbps - what am I missing here?
At a guess, a bug in ffmpeg2theora....

j^, any ideas?

Monty

On Thu, 2008-02-14 at 07:14 -0500, xiphmont@xiph.org
wrote:
> On Tue, Jan 22, 2008 at 4:59 AM, Patrick Byrne
<pbyrne@frontier.co.uk> wrote:
> > Hi,
> >
> >  Last night I encoded a movie at a variety of different bitrates:
> [...]
> >  ..but according to the file sizes, they all have a bitrate of about
253
> >  kbps - what am I missing here?
> 
> At a guess, a bug in ffmpeg2theora....
> 
> j^, any ideas?
no ideas right away, i changed something regarding the bitrate settings
some time ago in svn, does it still happen? i will release a new version
of ffmpeg2theora soon, is it possible to get a smaller sample that has
the same problem? does it still happen with the version from svn?

j