[streaming] Re: Streaming performance

[Anders Bøje Larsen]

Hi

I'm using a PVR350 to stream from a linux machine to a windows machine. It
all works fine, but the video is slightly jerky. I've noticed that data
from the card is transferred to VLS via the HD, and that could explain the
performance problems.

Is there a way to set up the system to transfer data from the card, to VLS
via memory? And why is it that the HD is used as transfer medium?
I've asked this question in the IVTV forum, because I thought that it was
the IVTV driver, that delivered data this way. I was told that the driver
could deliver data via memory, and that it is a VLS issue ????

It's a redhat9 dist. on a 800 MHz machine, with 500 megs of ram.
While streaming, I'm using about 20%cpu time, and about 50% ram.




Best regards
Anders





Anders Bøje Larsen wrote:

>
>
>Hi
>
>But why is it nessesery to transfer data via the disk? could'nt it be done
>in memory.
>
Do you stream a file from disk??? Or are you streaming a DVB card?

>More than one person has said that it should'nt use the disk at all, so
>maybe there is an "issue" on my setup.
>
>
Sorry I am not sure what kind of setup you have?

>>OK, but my system has 512 Megs of RAM, and there is only allocated 240
>>
>>
>megs
>
>
>>while streaming.
>>The sund from the HD indicates that a LOT of small data chunks is
>>written/read while streaming.
>>Any ideas?
>>
>>
>>
>>
>>
>Yeah defragment the drive! It really helps when your video stream is
>contiguous on the disk.
>
>For a small number of streams however it does not matter much, but for a
>larger number of streams (>5) it certainly will make a difference.
>
>I must warn you there are more knobs to tweak on your system for getting
>the best streaming performance, but this is outside the VLS/VLC scope.
>
>

Grtz,

Jean-Paul Saman.



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