793a - Jerky playback

jaydear

Member
Very unpleasant editing with this version. Mouse wheel causing random search direction and jerky searching. Mouse wheel movements seem to be buffered more than usual and the interface becomes unresponsive for several seconds until VRD has finished rolling back and forth - major PITA. Search bars not smooth. Forward and backward searching with jump buttons not smooth. Playback in editing window is jerky as if the video is freezing for one frame every second. The finished edit plays OK in VLC and PotPlayer. I'm editing 25fps 1920x1080i h.264 TS files.
 

Danr

Administrator
Staff member
1. Did you try the same file in Version 5? Is navigation smoother?

2. On the Tools>Options>H.264 page, which is the size of the frame cache?

3. When you say "this version" did you mean Build 793 or V6 in general? If build 793, then go to Tools>Options>PLayback and set the deinterlacer to None and re-open the file.
 

jaydear

Member
1. Yes, 5.4.84.771. Yes

2. V5 - 32 frames. V6 - 100 frames

3. Build 793. V6 Deint was already 'none' (and it's 'off' in V5).

After checking the above settings I looked around a bit and changed video driver from GDI to VMR9. I'd selected GDI as an experiment when p/b was jerky in this version 793 (it did help a bit). Anyway, jerky playback is now unnoticeable and the Nav bar is now fast, but the fine tune bar is still jerky. The mouse wheel is still buffered more than was usual in v5 and I have to wait until it's flushed itself by 'playing back' wheel movements before I can proceed. The mouse wheel is not working well for small movements and seems a bit confused about small forward and backward searching (but it is OK in v5). Jump buttons now OK.
 

Danr

Administrator
Staff member
1. GDI should only be selected as a driver of last resort. It's primarily intended for WINE users and others where the system doesn't have support for VMR, EVR or DX11.

2. Did you try running DX11, which if supported should be the fastest driver.

3. In V6 set the # of frames to 32 to match V5 and see if that helps.
 

jaydear

Member
Changed to DX11 after checking with dxdiag that it's the installed version. Then set # of frames to 32. No visible change. The p/b is still jerky and mouse wheel still buffering, etc.
 

open

New member
Got the exact same issue on latest beta one of the most hated problems is this, V5 is perfect yet i have changed the setting to match VMR9 device and tried diffrent deinterlace settings but not make auy change its still jerky and unusable . I have both V5 AND V6 open side by side and it like night and day using V5 is a dream with fast response its quick and as it should be but in V6 is so laggy even when playing back the video inside V6 i have notice the video jerky in V6 , I have noticed also V6 shoots the cpu up where V5 does not, this need to be fixed as matter urgency i cannot use the cut feature now due to this being so laggy and jerky with mouse wheel so unusable in V6, why dont just revert to the V5 settings and match them exactly to V5 why change something for the worst and make it unusable

this is really a deal breaker for me if this does not get fixed i cannot use the prgram for what i need and will stay on V5
 
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jaydear

Member
Yes, I agree, it's unpleasant to use. My problem now is that v6-4-91-798a has expired and v5 has some obscure problem that causes it to crash when trying to render some 1920x1080 jobs. Quickstream fix is no help either. Since the current beta has just expired with no replacement available I'm stuck. They've done a lot of good work on v6, and basically I like the program - it's just a huge pity that it's inherited old problems.
 

Danr

Administrator
Staff member
New V6 beta posted. Do we have sample files that illustrate this problem? Does the problem occur with VMR9 or EVR?
 

jaydear

Member
OK, did a quick check with a typical 1920x1080 25fps file. The program cursor is good. The Fine Tuning Slider, left/right arrows (set for 1 frame), and scroll wheel are not. It looks like those three have something like about a 1 second frame buffer, so when you're scanning backwards and that fills up or all the frames in it have gone past, the picture goes into a slowed down 'jerky' mode, maybe due to trying to flush the buffer and put more frames in. Especially when I'm scrubbing backwards. This would be down to processor speed or software ticks I suppose, but my PC is fast and has 16GB RAM and a 500GB SSD which is there for VRD to use.
 

Danr

Administrator
Staff member
MPEG2, H264 or HEVC file? Is Version 5 different from Version 6?

On Tools>Options>H264 what is setting for the number of frames in the cache?
 

jaydear

Member
... and if that v6 cache figure (100 frames) is supposed to be what's accessed by the l/r buttons and fine tuning slider, I'd say the number of frames stored is only about a second's worth, i.e. 25 frames, given the performance issues I'm seeing. I've also said elsewhere that normal 25fps playback is jerky in v6 and less so in v5, similar to the visual effect of repetiton of frames when watching 3:2 pulldown 29.97/30fps media.

MPEG2 files are much quicker to navigate and render in v5 and v6, no doubt due to the smaller frames and simpler codec.
 

open

New member
New V6 beta posted. Do we have sample files that illustrate this problem? Does the problem occur with VMR9 or EVR?
the only way i made it auyway useable is change to VMR9 and set filter option to simple, the new preset in V6 is unuseable and the new Deinertlace method is probably the cause the method used in V5 is fine but the new feature is yet anothor problem causing change in v6 for reason this has been done i do not know
 

Danr

Administrator
Staff member
So it's OK with VMR9 and simple deinterlace?

Can you tell which setting is causing you the problem, deinterlace or the DirectX11?

What CPU do you have?

What are the encoding dimensions and codec of your source video?
 
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