[theora-dev] Seek issue in cortado player

Nigel Simpson nigel at matsuplace.com
Mon Mar 15 11:48:02 PDT 2010

What's odd about Cortado is that it can reliably seek to a percentage  
position. The problem only occurs with pause (when the player pauses,  
it's off from the position you paused at) and playing after pausing  
(jumps ahead and has problem resuming audio). I thought I could get  
the pause position and the set it when resuming play, but this doesn't  
work: the reported position is wrong.

BTW, I'm building a video player application for Open Wonderland, an  
immersive 3D virtual world (http://openwonderland.org). Unfortunately  
if I can't resolve this pause/play issue, I'll have to find a  
different Java based video player. So, any workaround for this issue  
would be greatly appreciated.



On Mar 15, 2010, at 3:33 AM, salsaman <salsaman at gmail.com> wrote:

> When I looked at oggindex a few months ago the seeking was completely
> broken. The only player I know of which can seek reliably in ogg is
> the one which I wrote for LiVES:
> http://lives.svn.sourceforge.net/viewvc/lives/trunk/lives-plugins/plugins/decoders/ogg_theora_decoder.c
> It also has some nice optimisations, for example it will create a
> keyframe index as it discovers keyframes, and if you are playing
> sequentially it will just decode from the current position.
> Salsaman.
> http://lives.sourceforge.net
> https://www.ohloh.net/accounts/salsaman
> On Wed, Mar 10, 2010 at 11:12 PM, Nigel Simpson  
> <nigel at matsuplace.com> wrote:
>> One of the issues I've consistently run into with the cortado  
>> player app is seek behavior, so I was curious to see how cortado  
>> handles video encoded with the latest ffmpeg2theora (0.26) and the  
>> new -seek-index option, so I tried converting an h.264 video:
>> ffmpeg2theora tronlegacy-tsr1_480p.mov --seek-index
>> This output the following advisory messages:
>>> Allocated 372 bytes for theora keyframe index, 114 are unused.  
>>> Rerun with '--theora-index-reserve 258' to encode with the optimal  
>>> sized theora index, or use OggIndex to re-index.
>>> Allocated 372 bytes for vorbis keyframe index, 59 are unused.  
>>> Rerun with '--vorbis-index-reserve 313' to encode with the optimal  
>>> sized vorbis index, or use OggIndex to re-index.
>> So, I re-encoded using the recommended parameters:
>> ffmpeg2theora tronlegacy-tsr1_480p.mov --seek-index --theora-index- 
>> reserve 258 --vorbis-index-reserve 313
>> When I play the converted video using cortado 0.5.2, seeking still  
>> seems to be broken. For example: play a video, pause and then press  
>> play, the player resumes several seconds after the paused position.  
>> Also, pause and drag the time slider. The slider jumps to a new  
>> position after you release the drag rather than where the slider  
>> was dragged.
>> Does cortado support OggIndex?
>> Are there any workarounds for reliably getting and setting the  
>> playback position?
>> Thanks!
>> Nigel
>> _______________________________________________
>> theora-dev mailing list
>> theora-dev at xiph.org
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