Hello Alec,

Can you provide the following so CyberLink QA can investigate?

1. Generate and attach DXDiag.txt file. See here for details: http://forum.cyberlink.com/forum/posts/list/50105.page#post_box_263486


2. Duplicate your editing, and then take a screen snapshot of the Produce window just before you click the Produce button. Attach that image here as well.


3. Submit a technical support ticket using the link below. You should attach 1 and 2 items as well. Let me know the support ticket number once submitted.


4. If possible can you create a short clip from the original video? Maybe 5-10 seconds. Then share it on Google Drive or somewhere it can be accessed. Two clips if possible, both before and after the speed effect is applied.

Cheers

PowerDirector Moderator

For customer support related issues, please contact:
- Customer service: https://membership.cyberlink.com/support/customer-services.do
- Technical support: https://membership.cyberlink.com/support/service/technical-support.do

Quote Hello Alec,

Can you provide the following so CyberLink QA can investigate?

1. Generate and attach DXDiag.txt file. See here for details: http://forum.cyberlink.com/forum/posts/list/50105.page#post_box_263486


2. Duplicate your editing, and then take a screen snapshot of the Produce window just before you click the Produce button. Attach that image here as well.


3. Submit a technical support ticket using the link below. You should attach 1 and 2 items as well. Let me know the support ticket number once submitted.


4. If possible can you create a short clip from the original video? Maybe 5-10 seconds. Then share it on Google Drive or somewhere it can be accessed. Two clips if possible, both before and after the speed effect is applied.

Cheers

PowerDirector Moderator

Thank you for your reply.

The ticket ref. is CS001676380



Original footage shot at UHD 25p PAL then Produced at 2K H.264 PAL 25p

https://drive.google.com/file/d/0BxPT5TweZIzOdlluX1E1SUhTelE/view?usp=sharing

Choppy output is the above clip with speed increased to 1.2 using Video Speed Designer (Entire Clip).

https://drive.google.com/file/d/0BxPT5TweZIzOUy1fNnFTd19vT2c/view?usp=sharing



Thank you,



Alec

Alec,

I'll be curious to what CS says, to be honest, I see no issue with your choppy playback on my system for what PD is doing. All I see is that for every 6 frames of original footage, a frame needs to be dropped to get to 5 frames for your 1.2 speedup. So for each sec of video at 25fps, you need to drop just over 4 frames. In regions where the car has traveled a reasonable distance per frame, dropping one of these frames makes things appear choppy as you call it. There is no "interpolation" that I see, you simply drop a frame. This effect can easily be seen by the following:

1) Put your original Alec200 original.mp4 in track 1
2) Put your Alec200 speed increase 1.2.mp in track 2 and set opacity to like 50% or so
3) set the scrubber to 00:00:06:00
4) now move the track 2 video so it's clip time is at 00:00:05:00 to line up with the 00:00:06:00 of original clip. These frames will exactly overlay as 6/1.2=5
5) now start frame advancing one frame at a time (period "." key works good for that)

What you will see is the original car and the opaque car exactly overlay at this aligned timepoint, and also for the first 4 frame advances, on the fifth frame (00:00:06:05) you will see some blur for the dropped frame to get your speedup. So now the two cars are no longer aligned but slightly offset. This exact offset between the opaque car and the real car will stay until the 10th frame (00:00:06:10) when another offset (skipped frame) will occur. There is no blending as you desire, one simply has a dropped frame during speedup which can cause the playback chop you observe, especially when the source is only 25fps.

Jeff

Quote Alec,

I'll be curious to what CS says, to be honest, I see no issue with your choppy playback on my system for what PD is doing. All I see is that for every 6 frames of original footage, a frame needs to be dropped to get to 5 frames for your 1.2 speedup. So for each sec of video at 25fps, you need to drop just over 4 frames. In regions where the car has traveled a reasonable distance per frame, dropping one of these frames makes things appear choppy as you call it. There is no "interpolation" that I see, you simply drop a frame. This effect can easily be seen by the following:

1) Put your original Alec200 original.mp4 in track 1
2) Put your Alec200 speed increase 1.2.mp in track 2 and set opacity to like 50% or so
3) set the scrubber to 00:00:06:00
4) now move the track 2 video so it's clip time is at 00:00:05:00 to line up with the 00:00:06:00 of original clip. These frames will exactly overlay as 6/1.2=5
5) now start frame advancing one frame at a time (period "." key works good for that)

What you will see is the original car and the opaque car exactly overlay at this aligned timepoint, and also for the first 4 frame advances, on the fifth frame (00:00:06:05) you will see some blur for the dropped frame to get your speedup. So now the two cars are no longer aligned but slightly offset. This exact offset between the opaque car and the real car will stay until the 10th frame (00:00:06:10) when another offset (skipped frame) will occur. There is no blending as you desire, one simply has a dropped frame during speedup which can cause the playback chop you observe, especially when the source is only 25fps.

Jeff

Thank you for your analysis of the issue. I'm not suggesting that PD has a fault and is causing the choppy playback. I'm more interested in how to speed up the video whilst producing a smooth result. You mention that the source material is only shot at 25 FPS so I presume I would have been better off recording at a higher rate? I will note that on future shoots if that's the case. Is there anything I can do to produce a smoother result with what I have or am I stuck with it?

Thanks for any further advice.

For PD, yes, a higher frame rate source video helps. The approach will still simply delete frames to get the speedup you desire, but now those frames are spaced closer in time, 50/sec instead of 25/sec for instance. So the video playback jump from the vehicle in one location to the next across this deleted frame for the desired speedup is less, so to the eye during playback it appears smoother as each frame has less overall movement so deleting one frame periodically is not so apparent.

Jeff