Openshot-qt: Not buffering properly

Created on 7 May 2018 · 9Comments · Source: OpenShot/openshot-qt

I play my project in OpenShot and it keeps on starting and stopping because of an insufficient buffer length. With music it's very annoying. Please can you increase the buffer length and/or make OpenShot detect when it needs more buffering?
OpenShot 2.4.1-dev1 / Installer: OpenShot-v2.4.1-104-ge93e5f7-59-697-x86_64
Windows 8.1

EDIT (OpenShot-v2.4.1-115-ge7a99e9-59-697): I set the cache limit to 2000MB and restarted OpenShot and it still lagged.

Source

sspmrsomebody1

Most helpful comment

@DylanC - Cap'ain, perhaps the buffer thingy needs to be worked upon? o.O

peanutbutterandcrackers on 30 May 2018

👍2

All 9 comments

You can change the amount of RAM and/or disk space allocated to the preview cache in the Edit->Preferences->Cache->Cache Limit setting.

N3WWN on 7 May 2018

👍2

Hmm, I tried that once and I think it still did it. Perhaps I didn't restart it and that was necesarry?
Anyway, I think the problem could be avoided by having a longer buffer.
Thanks for the tip though. :)

sspmrsomebody1 on 10 May 2018

👍2

The problem is that OpenShot doesn't buffer far enough ahead, and it also slows down when debuffering behind,

sspmrsomebody1 on 26 May 2018

@DylanC - Cap'ain, perhaps the buffer thingy needs to be worked upon? o.O

peanutbutterandcrackers on 30 May 2018

👍2

Currently using OpenShot-v2.4.1-115-ge7a99e9-59-697-x86_64, it still has buffer problems when buffering chroma key filtered video and fade transitions.

sspmrsomebody1 on 31 May 2018

OpenShot buffers too slowly especially when debuffering to conserve memory and rendering more demanding effects such as Chroma Key and fade transitions.

sspmrsomebody1 on 3 Jun 2018

I have notified the devs regarding this issue. Hopefully, some steps will be made to resolve this issue (partially, even) by rc2. Thank you for helping out! :)

peanutbutterandcrackers on 5 Jun 2018

@sspmrsomebody1 Can you try v2.4.2 and let us know if you have any success?

DylanC on 2 Jul 2018

Hello - sorry for reviving an old thread, but I was searching for openshot forward caching and came across this.
I had the issue in 2.4.2 and just updated to 2.4.3 and it's still present.
I'm using Windows 10.
I store my media on a USB drive so mostly use that, so originally I put it down to that.
I tried my media on the internal SSD and it still had the issue.

It just doesn't buffer far enough ahead. If I move the playhead back again it plays fine and the thin blue cache bar is there. As soon as I change something and it's not cached, it does the stutter thing again.

I increased the cache setting from 2048 to 3072. Before restarting, Openshot was using over 3gb ram anyway. After restarting it was using 1.5gb...
I've just increased the setting to 4096 and tried playing a short bit of a project, and it still stutters, and Openshot was using less than 1gb of ram.

Anything else I can try or any more information I can provide?