[vlc-devel] playback errors

[Derk-Jan Hartman]

On 24 jul 2008, at 19:48, Felix Paul Kühne wrote:
> Am 24.07.2008 um 17:40 schrieb Derk-Jan Hartman:
>> On 24 jul 2008, at 16:53, Georg Seifert wrote:
>>> hello,
>>>
>>> I follow the list and the nightlies for some time now and 0.9
>>> improves
>>> stability a lot. But I have one problem. Lot of my .avi files  
>>> (mostly
>>> xvid) have problems. They start with a black screen and needs  
>>> several
>>> seconds to show some video and it needs some seconds to get rid of
>>> the
>>> blocks. The same happens if I skip forward. Sometimes it helps if I
>>> hit pause/play.
>>> Is seems if has some problems finding keyframes.
>>>
>>> Nothing of this happens in vlc 0.86.
>>>
>>> I use the VLC nightlies, Mac OS X 10.5.4 PPC.
>>
>> I've noticed this as well actually. Not sure what is causing it.  
>> Using
>> something as x264 to make the load higher on the computer shows the
>> problem even better.
>
> ... covered by trac ticket #1719 [1]

That ticket is about mp4 files. how do they relate ?

I have a feeling the problem is as follows. During the start of  
playback of a file, a lot is going on, putting quite some stress on  
the CPU. This results in images already being a bit "late" when they  
are first displayed. Now since 0.9.0 we are animating the resizing of  
the window. It seems that this is putting quite some extra stress on  
the computer (his being a PPC), causing the images to be even more  
late, and dropped by the computer. The PPC machine is a bit older, so  
i'm guessing that you are a bit "easier" affected by this problem than  
I am, because i have an Intel Core2Duo. Ergo, you see the problem with  
xvid avi's, i only see it on HD h264 matroska files.

The seeking distortion is "normal". I tested it, and the performance  
there hasn't changed much between 0.8.6 and 0.9.0

DJ