Clip is jerky but project is smooth

[eidauk]

I'm new to VS and I've been loving it. I'm wondering if it is normal for my clips to have jerky preview. I am editing 1080p MOV clips and I've made sure that Smart Proxy is enabled and that the files do exist. Smart Proxy settings are default to activate with any clip that is larger than 720X480. After I've dragged a clip onto the timeline I get jerky preview if I select "clip" and then click play. But if I select "project" it plays smoothly. Scrubbing is also smooth. My question is why are my clips so jerky? It seems that "clip" preview is automatically using the original video file and not the proxy. I'm on a slow computer, but that's not the issue because everything except the individual clips plays smoothly. And yes, the Smart Proxy icon is on my clips and it's had plenty of time to complete the proxy creation. I've even completely removed VS with Revo Uninstaller and reinstalled it. No change.

Any help would be greatly appreciated. If nothing else, I'd like to learn why VS is not using the proxy for all previewing. Thank you.

[lata]

Hi

Welcome to the forums

I don,t pretend to know all about PC's and processors, but Corel recommend using multi-core processors.

Editing AVCHD is very demanding on your computer and your single core is gonna struggle.

On the good side you are able to play ok using Smart Proxy
However rendering the project to another format may take a long time.

Some system recomendations from the Corel site

[teknisyan]

I'm new to VS and I've been loving it. I'm wondering if it is normal for my clips to have jerky preview. I am editing 1080p MOV clips and I've made sure that Smart Proxy is enabled and that the files do exist. Smart Proxy settings are default to activate with any clip that is larger than 720X480. After I've dragged a clip onto the timeline I get jerky preview if I select "clip" and then click play. But if I select "project" it plays smoothly. Scrubbing is also smooth. My question is why are my clips so jerky? It seems that "clip" preview is automatically using the original video file and not the proxy. I'm on a slow computer, but that's not the issue because everything except the individual clips plays smoothly. And yes, the Smart Proxy icon is on my clips and it's had plenty of time to complete the proxy creation. I've even completely removed VS with Revo Uninstaller and reinstalled it. No change.

Any help would be greatly appreciated. If nothing else, I'd like to learn why VS is not using the proxy for all previewing. Thank you.

The jerky when you preview the video depends on the system that you are using, from that I can see on your profile you are using a PC with a celeron processor. Which is less than the minimum system requirements, so it's just normal to see jerky preview.

As for the smart proxy, just let the system create the proxy files, since you're using an old system, it may take time in creating them.

[eidauk]

Thank you lata and Abiel for your responses. I realize my system is sub-par, but the reason I purchased VS is because it was the only one that worked beautifully smooth even on my antiquated system when I had the trial version of x4. It still does not make sense to me why the project will preview smoothly, but the clip (the same one that played smoothly in project mode) plays jerky. It appears that my VS is using the proxy for the project preview, but it ignores the proxy and plays the original HD file when I preview the clip. Why is this? It seems to be a bug, because it makes no sense otherwise.

Here's a test I've done. I created proxies using very low quality (small file size with very degraded video quality) profile settings. When I scrub or play the project, it's obvious that the proxy is being used because the preview picture quality is very low. This, of course, plays very smoothly. (This next part is what I'm hoping the Corel community can answer for me.) As soon as I select "clip" and then "play," the preview window goes black for a split second and the low quality preview window is replaced by a very jerky, but crystal clear HD preview. That's the part that makes no sense. Why does VS not use the proxy when previewing the clip?

If someone would be so kind as to perform this test on their machine, I would appreciate it so I can confirm that it is a bug and not just my system.

[lata]

Hi

I have always been under the impression that Smart Proxy is used for "Project Playback" and not "Clip Playback".

Clip playback uses the original files on the pc, in fact we would normally see smoother playback than in project mode, we would then advise to use Smart Proxy to improve project playback.

The fact is that poor clip playback could be attributed to your pc's ability to process AVCHD files.

Can you right click a HD clip in the timeline and select properties, what are they.?

You could of course convert the original video files to another format, (Batch Convert) deciding which to use really depends on what you are intending to make. Then there should be no need for Smart Render?
----------------------------------

Using a sample HD video
The video is very demanding on my pc, noticeable as the timeline refreshes after first inserting the clip.

When i playback in project mode there is a short delay, (2 secs) a few seconds before play starts, the screen always displays the video.
When i playback in Clip mode, the screen goes black for a few seconds before play starts.

Project playback was also ok without smart proxy

[eidauk]

Thank you lata for your help. You cleared up the mystery. I still don't think it makes sense why clips aren't proxied but the project is. As requested, here's the clip properties:

I want to keep the video quality up for archiving, so converting to a lower quality isn't an option for me. Regardless of this little problem, I'm still very impressed that VS works so smoothly on my dinosaur.

Thank you to all. I'm sure this won't be the last time I post.

[lata]

Hi

Thanks for the info,

A couple of points........
would the camera be a Canon SLR.

Canon use Mov H264 as its compression, however i do not know how to encode to this combination, Video Studio does not read the properties fully, so the compression details are empty, view your image.

Frame Rate

23.976 fps although a video standard is not extensively used.
You will not find any default templates using that rate. you will have to use the Custom option or Make Movie Templates Manager. I think the Mpeg Transport Stream option would give 23.9fps

Using a different rate 25 or 29 depending on whether you are Pal or Ntsc is one option.
For future recordings I would advise that you change the cameras setting frame rate.