Question / Help Local Recording, dropling loads of frames???

[BlockAboots]

I have followed R1CH's guide on getting high quality local recordings.....

viewtopic.php?f=18&t=2972

And am using this to demo some MAME emulation footage, i am using OBS Game Capture mode but have noticed that whilst the audio in the output file is fine the video stutters and loses alot of frames.

I have attached the log file from the session, any ideas on why im losing frames??

 

[Xianahru]

Your CPU cant handle the preset you are using, set it back to 'veryfast'.

 

[BlockAboots]

Really?, i have a i7 920 overclocked to 4Ghz!

 

[paibox]

I think you're underestimating just how heavy a load 1080p60 using the "fast" preset is.

video encoding and uploading - [79%] [avg time: 19.606 ms] [avg calls per frame: 1] [children: 78.9%] [unaccounted: 0.145%]

It's taking the encounder 19ms on average to encode a frame for you, for 60 frames per second, this would need to be approximately 16.6ms, preferrably a bit lower, since it's the average encode time.

 

[BlockAboots]

I'll try cutting it back to 30 or 40 fps. What effect would setting preset from fast to veryfast have on the quality?

 

[paibox]

Since you are using an unlimited buffer size, it would use slightly more bit rate. The quality itself should remain the same.

 

[BlockAboots]

Ok thanks, im able to get away with Faster preset, 60fps and changing the x264 quality to 18.

One think i have noticed whith Game Capture mode, it appears to capture the audio of the PC not just the game ive selected, i had some music playing at it picked that up aswell as the game audio, is there a way in Game Capture mode so it just captures the game audio and nothing else

 

[BlockAboots]

Hmm, i tried the veryfast preset option to take stress of my cpu, and whilst i was capturing OBS reported no loss of frame and had a constant green bar, when i watch the capture file back it have loads of artifacts and pausing.

 

[paibox]

Well, I've tried your settings on 3770K running at 3.7GHz, and I saw OBS spike up to around 70% CPU usage several times, and depending on which game you are capturing with MAME, that just might be too much. Your custom "crf" setting is causing quite a bit of extra load for you, I wouldn't really recommend going lower than 18 for visually lossless anyway.

 

[BlockAboots]

So anything lower than 18 your just wasting CPU cycles and disk space, as you wouldn't be able to see any difference between say 18 to 15??

 

[hilalpro]

So anything lower than 18 your just wasting CPU cycles and disk space, as you wouldn't be able to see any difference between say 18 to 15??

A Constant Rate Factor of 18 should be enough if you're uploading to youtube or even for practical archiving purposes.