Re: ogle bugs

Thu Apr 22 2004, Blake Sloan wrote:
> First,
> Good work! Ogle seems to work (almost).
> 
> Running from the command line with no args. The title menu from my
> home-made DVD appears. Selecting a title starts the sequence. Three
> undesirable things happen: 
> 
> 1. An error message is written to stdout (or stderr) once every few
> frames (see 'output' below).
> 
To the best of our knowledge this field is unused and should be zero,
however DVDs made by some DVD mastering software seems to set it to
non-zero values.  The waring is emmited because we don't know what it
means and does not handle the value.

> 2. The video appears to be playing smoothly at half speed. The audio is
> synchronized and therefore very low in pitch.
> 
I see from the debug output that since no speaker configs are found in
the Ogle configure files it lets the OSS audio driver determine the number
of channels.  It says that it opened in 4 channel mode, however it does
not seem to actually playback the samples as 4 channel audio.

Get a fixed audio driver, either a new version or report the bug.
A workaround is to add a speaker configuration to Ogles config files.
See 'man oglerc' and there should be several emails in the archives of
this list where it's explained.

> 3. On some frames of video, black pixels (actually vertically stacked
> pixel pairs) appear in some areas of high luminance     
> 
Umm.. the unoptimized fallback C code for the decoding functions is 
missing a call to a saturate/clipping function, values can overflow
( white pixels turn black and so on).

Please recompile with mmx support or use a properly built binary package.

> * anything else you think could be relevant of use.
> 
> The DVD was made on a dvd recorder from CyberHome (I think the guts are
> Phillips) from some home videos.
> 
This is interesting, I guess the non-zero values is something they have
added.  They don't really seem to be needed though.

> Getting ogle to install was a little tricky. Mostly because the a52
> library in the liba52 rpm is static and the ogle rpm looks for a shared
> lib (.so)
> 
Humm.. which rpm is that?  I'd recomend the ones from freshrpms.net

> Build: Linux 2.4.22-pre7-ctx17 #4 SMP Tue Jul 22 22:29:40 HST 2003 i686 athlon Sat Oct 18 12:16:48 EDT 2003 Xv oss

This line should also contain mmx (just before Xv) when compiled successfully.

Regards
-- 
Håkan Hjort