Why does SVP sometimes get slow? (Page 1 of 2)

It's not due to buffering because I have had the exact same issue at rare times and I've found a way to make it revert to normal performance levels with 100% success rate.

Simply put, disable GPU acceleration in SVP, and then re-enable it.

To emphesis that it's not buffering, it has occured with an already-downloaded video that is running from a ramdisk, my web browser closed, network utilization at 0%, CPU utilization at 0-1% when video paused, windows update disabled, and SVP and MPC-HC both running from an SSD.

Playing with the options didn't seem to solve it for me, although it does allow lowering CPU usage by lowering settings.

I just had the issue again. I was playing a 1080p 30fps video and it was lagging with CPU topping at 100%. I considerably lowered the settings so that the CPU usage would be 80-90%, but it still played with lots of dropped frames. I de-activated and re-activated OpenCL. I tried shifting to the old core libraries to see if it would do better, but it just made the CPU usage even higher. Then after reverting back to the latest core libraries, the same video plays fluidly with those same settings with ~50%-70 CPU usage.

The profile also keeps switching while playing this video

1080 47 24. Duration: 795 ms
22:17:43.426; ===== Playback
30.363 * (47 : 24) = 59.461 fps
Auto crop: [0:0:0:0]
22:17:44.595; FalseVFR ffdShow-framerate: -Dwn-> 29.968 fps
22:17:44.595; express clear interval
22:17:44.595; stabilized ffdShow-framerate: 29.968 fps. SVP Index: 0.29/0.79
22:17:44.597; SVPMgr: main "C:\ProgramData\SVP 3.1\" 1920 1080 29.968 1920 1080 2 1. Duration: 782 ms
22:17:45.379; ===== Playback
29.968 * (2 : 1) = 59.936 fps
Auto crop: [0:0:0:0]
22:17:53.948; ===== rewind forward 00:02:31 / 503194:33:01
22:17:57.911; FalseVFR ffdShow-framerate: -Up-> 34.04 fps
22:17:57.912; this is changing #2. ffdShow-framerate: 33.081
22:17:58.845; this is changing #3. ffdShow-framerate: 31.781
22:17:59.789; this is changing #4. ffdShow-framerate: 31.177
22:17:59.789; express clear interval
22:17:59.789; stabilized ffdShow-framerate: 31.177 fps. SVP Index: 0.92/1.01
22:17:59.795; SVPMgr: main "C:\ProgramData\SVP 3.1\" 1920 1080 31.177 1920 1080 21 11. Duration: 614 ms
22:18:00.409; ===== Playback
31.177 * (21 : 11) = 59.52 fps
Auto crop: [0:0:0:0]
22:18:01.638; FalseVFR ffdShow-framerate: -Dwn-> 29.968 fps
22:18:01.638; express clear interval
22:18:01.639; stabilized ffdShow-framerate: 29.968 fps. SVP Index: 0.44/0.78
22:18:01.646; SVPMgr: main "C:\ProgramData\SVP 3.1\" 1920 1080 29.968 1920 1080 2 1. Duration: 634 ms
22:18:02.280; ===== Playback
29.968 * (2 : 1) = 59.936 fps
Auto crop: [0:0:0:0]

Another video, 1080p 24fps, was also lagging. I tried lowering all the settings and saw little improvement, until I lowered SVP Shader from Complicated to Standard and then the CPU usage when WAY down. I could raise all other non-expensive settings with no issue. But then, when setting SVP Shader to Complicated with those higher settings, it plays fine!

Well for one thing, codec packs are not really the greatest things to be using nowadays - LAVfilters should include everything you need, and it's even bundled with MPC-HC.  Not only that, but said codec packs can even conflict with LAVfilters.

Which brings me to the next thing - hardware acceleration.  With LAVfilters, you can configure what type (if any) hardware acceleration to use, but with something like a codec pack that kind of stuff is much more unknown.

Honestly, you'd probably be better off uninstalling any codec packs and just using the newest 32bit version of MPC-HC (v1.7.9).  If for some reason you don't want to install a new version of MPC-HC, you can always just use the PortableApps version (the PortableApps "installer" is really just a fancy-looking extractor):
http://portableapps.com/apps/music_vide … c-portable

Just be sure to follow the instructions on this wiki page for setting up MPC-HC to use SVP:
http://svp-team.com/wiki/SVP:MPC-HC

When disabling and then re-enabling SVP's "GPU acceleration", make sure you do it in this manner:

1. video playling with GPU acceleration
2. pause video
3. disable GPU acceleration
4. play video for 5-10 seconds
5. pause video
6. enable GPU acceleration
7. play video

Sounds like a miracle

Nintendo Maniac 64
sounds to me like it's a bug, not a miracle

I mean this is the miracle --> "Simply closing and re-opening MPC-HC did not solve it" BUT "disable and re-enable GPU acceleration does"

I bet it's a graphics driver issue then

Mystery
Try to monitor GPU with GPU-Z when lagging starts. GPU load, memory load, video engine load.

Reverting back to AviSynth 2.5.8 does seem to make the problem go away. So far, it allows me to keep settings higher while keeping videos playing with consistency.

Not sure what your question is... it always outputs at 60fps

I usually experience this kind of lag when playing 1080p, even with 720p video.
But with 1080p it's more often.

I always thought this is simply insufficient CPU capability, although I'm not sure if this is your case.
That's why I set the SVP setting with 720p higher than 1080p, profile.

And, isn't this normal?
Every lags that I observed are happened when there's highly motion scenes, or many small items moving fast, like particles motion or that kind of motions
so isn't this just a normal case for CPU for calculating the motion?