video artifacts in certian file's/formats

[jahwoto]

vlc media player version 1.0.5
Still in both present in vlc media player version 1.1.0

Still only with ogg, ogv stuff present in vlc media player version 2.0.0



I have discovered a problem with two formats.
rmvb and ogv
Update: rmvb problem is solved in vlc media player version 2.0.0

When playing all goes well.
But when going a little bit back or forward on the time bar.
(Clicking on the new position with the mouse, no dragging.)

The decoders don't seem to take into account that the reference frame has changed.
I see all kinds of block y artefacts, bugs.

When the image gets completely refreshed it's gone.
Which happens after a few seconds in all of the three video's I encounter this problem with.

The video files are:

The Citizen of The Year
http://www.watsonfilms.net/Films.htm

The Abandoned Horror Color
http://www.archive.org/details/Abandonedhorrorcolor
(Choose the Ogg Video version.)
(The problem doesn't happen in the wmv version.)

All of the Dead
http://www.archive.org/details/allofthedead
(Scroll down choose the Ogg Video version.)


Firefox (3.6)doesn't have this problems with ogg video files.
It plays and doesn't gets those artefacts when jumping to a random time.
With the mouse and clicking on the time line.


If it's confirmed, please contact the ffmpeg and Xiph.org (if a good idea, they care about all the implementations of their codecs) and add the bugs to their bug tracking system.
Please fix this bug in the theora codec used.
About the rmvb and ogv codec implementations, please fix the playback issues.


Has anybody else noticed this with (another?) codec?

Update: added newer version where ogg codec still has these problems: 2.0.0

[jahwoto]

Version 2.0.4 ogg artifact when going to arbitrary position in video.

[Jean-Baptiste Kempf]

Version 2.0.4 ogg artifact when going to arbitrary position in video.

This is not specific enough, sorry...

[jahwoto]

Version 2.0.4 ogg artifact when going to arbitrary position in video.

This is not specific enough, sorry...

It's the same problem as in previous replies.
Read from thge first post to know what the problem is.

Which is artefacts appearing when seeking to an arbitrary position in an ogg video.
The problem is that the decoder seems to apply the intra frames against the old reference frame instead of the reference frame the new seeked position suppose to use.


Here is a link to a short blog post about it, features a screenshot:
http://blog.pearce.org.nz/2009/05/video ... ments.html

Firefox seems to have had the same problem and made a fix for it:

Link to firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=629618

Video seeking improvements by Thundering Herd:
http://blog.pearce.org.nz/2009/05/video ... ments.html
(Describes something about a fix.)

Keyframes in ogg videos by Thundering Herd:
http://blog.pearce.org.nz/2010/01/index ... s-for.html

[jahwoto]

Artifacts still present in vlc media player version 2.1.0.
For details and description problem see earlier posts in this thread.

[Jean-Baptiste Kempf]

Yes, we have someone working on that for 2.2.0

[jahwoto]

Artifacts are solved in vlc media player version 2.2.0.

This issue can now be solved by updating to VLC media player 2.2.0 or newer and can be closed.

[Jean-Baptiste Kempf]

Yes, was done for ogg and wmv for 2.2.0