[vlc] Re: Difficulties to decode video stream with vlc

[James Yates]

Sounds to me like your platform isn't quite up to the job. Decoding 
mpeg2 in software in real time is quite processor intensive and sounds 
to me like your PC just can't quite cope. The codec is taking too long 
to decode some frames and so is running out of time. The decoder buffer 
is filling up and overflowing. A common problem. Can you try a 
different, more powerful PC? I guess from your description that this is 
a laptop with one of those pentium mobile CPUs. Do you have a power 
supply plugged in or is it running on batteries. These laptops go into a 
reduced power mode when running off batteries and the proccessor core 
clock runs slower to conserve power. Simply applying mains power from a 
supply will increase the PCs performance.

James

Florent GAUDILLAT wrote:

> Hello,
>
> I use an AXIS Videos Server (AXIS- A250S). It transmits a multicast 
> video stream.
> The reception of the multicast video stream should be done with VLC 
> under LINUX.
>
> My system configuration is:
>
> - Linux REDHAT Enterprise 3.0 distribution
>
> - VLC 0.8.1
>
> - Intel Pentium M 1.6 GHz, 1G Ram
>
> - Chipset Intel E7501 with ICH4 and a P64H2 PCI Bridge
>
> - NVIDIA MAP17 series high performances graphics controller with 
> integrated DDR DRAM 32MBytes
>
> On VLC, we execute the following command for get the video stream:
>
> /File -> Open a video stream -> HTTP/FTP/MMS 10.0.10.2/view/sdp/guide.sdp/
>
> Today, I use the livedotcom demux module, libmpeg2 decoder module, 
> xvideo or sdl video out module.
>
> I’ve got a video streaming but the video is freezing few seconds, 
> restart and freezing again and that in continuous.
>
> When I analyse the message from vlc, I see that a lot of pictured are 
> not decoded (Messages example: main debug: decoded 91/105 pictures).
>
> Others messages are present like:
>
> - vout warning: early picture skipped
>
> - Late picture skipped
>
> - Message queue overflowed
>
> - Main warning backward_pts != dts
>
> - Main warning backward_pts != current_pts
>
> Is somebody can explain me this different messages?
>
> Is my hard configuration is sufficient for using VLC?
>
> Why did my video is freezing and why some pictures are not decoded?
>
> Thanks.
>
> Bye
>
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-- 
James Yates
Software Systems Engineer
Packet Vision Ltd
Tel: +44 (0)118 935 7070
Fax: +44 (0)118 935 7330

www.packetvision.com

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