Frame Rate (fps)

[PaulBlok]

I am streaming directly from a tvcard and this works well. However, I have set the framerate to 25 fps, but the output is just 6 fps! This means that the image is very shaky, as you'll understand. CPU is at 100%. The funny thing is that a few weeks ago I didn't have this problem, so I know it must be possible to reach a higher framerate.
Whenever I start streaming it begins with about 17 fps, but almost immediately drops to 12 and then to 6 fps. Even the inputscreen is shown shaky.
Any suggestions?
Thanks!

[Baldrick]

PLease give us more information.

What software?
What video and audio codec are you streaming in?
What resolution/frame size?

Try change different video codec and resolutions.

[PaulBlok]

Sorry, Windows Media Encoder.
I have tried almost all different video and audio codec combinations;
340 Kbps and 25 fps.
I really don't understand this. It worked so well!

[jagabo]

I believe WME decreases the frame rate when the video is too complex for the selected bitrate (WMV9 certainly does this when encoding). Try a higher bitrate or a smaller frame size.

[guns1inger]

Streaming over what type of connection ?

[PaulBlok]

Upload is max 1 Mbit/s but on average it is 0,8 MBit/s. Should be sufficient.

I started with higher bitrates, but decreased hoping that would help but it didn't. Smaller frame size doesn't help either.
It seems it needs more CPU?

[jagabo]

It seems it needs more CPU?

Run Task Manager while streaming. How much CPU usage do you see?

[Baldrick]

CPU is at 100%.

So you probably need a faster cpu.

[PaulBlok]

That's a bummer...

[poisondeathray]

You can try capturing using a format that is not as cpu intensive (e.g. uncompressed, huffyuv..etc..), then encode offline at a later stage to WMV or your end desired format. Realtime capture/encoding using WMV isn't a good idea because of high cpu usage, thus dropped frames

The bottleneck might become disk I/O depending on what format you choose

[jagabo]

If you have the option, try capturing at quarter D1 (352x288) and stream that. If CPU usage is still to high, resize down to 1/2 (both dimensions) and see if you can stream that.