Posted: 3/28/2007 1:13 PM
Post subject: Realtime Video Encoding
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antd
Joined: 3/18/2006
Posts: 971
Location: Great Britain
I used to be able to encode uncompressed or using Xvid codec in real time with no loss in speed. So I was able to play at 60 or at least 58FPS whilst encoding. I have since installed windows vista and I lost this ability. I have now gone back to XP and still cannot encode and play at the speeds I had previously. Does anyone have an idea what's happening? I have no idea >.<
Posted: 3/28/2007 1:19 PM
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laughing_gas
Former player
Joined: 10/1/2006
Posts: 1102
Location: boot_camp
Windows vista requires a lot more cpu power, maybe that could be the cause. As for xp screwing up, that I don't know. Try formatting the hard drive and then install it again.
Borg Collective wrote:
Negotiation is irrelevant. Self-determination is irrelevant. You will be assimilated.
Posted: 3/28/2007 1:49 PM
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DeHackEd
Emulator Coder, Site Developer, Former player
Joined: 11/6/2004
Posts: 833
There are settings for encoding. Defaults for XviD would be considered "not bad" quality. If you want real-time, you'll have to reprogram them to "poor". Motion estimation has to go, disable those CPU-intensive operations, etc.
Posted: 3/28/2007 2:57 PM
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antd
Joined: 3/18/2006
Posts: 971
Location: Great Britain
Thanks for responses. I didn't change anything last time though. Hmm, maybe I did, but I couldnt see any difference in quality. thanks,
Posted: 3/28/2007 2:59 PM
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DeHackEd
Emulator Coder, Site Developer, Former player
Joined: 11/6/2004
Posts: 833
There's two kinds of quality: the one where you dump CPU to make better encoding decisions, and the one where you throw bits at the problem. By using fixed_quant encoding, you force quality to be the same. Thus eliminating CPU means adding bits. You'd make bigger files, but you'd get them faster.
Posted: 3/28/2007 3:33 PM
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Tub
Joined: 6/25/2005
Posts: 1377
for best results, you should save the video uncompressed (or with a fast lossless codec), then re-encode it to xvid using proper settings. re-encoding can be done with VirtualDub for example.
m00
Posted: 3/28/2007 5:46 PM
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SXL
Joined: 2/7/2005
Posts: 571
huh, the topic's title does say "realtime". your idea defeats that. antd, are you sure you have the same combination of software/codecs ? did you tweak any parameter ?
I never sleep, 'cause sleep is the cousin of death - NAS
Posted: 3/30/2007 2:32 PM
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antd
Joined: 3/18/2006
Posts: 971
Location: Great Britain
Well, this time I installed Klite codec pack. Last time I did not. But it seems Klite pack installs the same Xvid codec which I installed manually last time. It's so strange, as last time I could encode using uncompressed (no settings to change) at normal speed (60FPS). It's not such a problem now though. I can use 3rdparty screen capture programs such as hypercam2 or camtasia and record at 60FPS with no slow down at all. The quality is still awesome.