openshot uses CPU for no reason

[Alexandru Băluț]

Ubuntu 10.10 64
OpenShot 1.2.2 installed using the Ubuntu Software Center

Steps to reproduce:
- Open OpenShot, notice the openshot process uses x% CPU for no reason (no video processing, no clip added to the Project Files, ..). x=14 in my case.

(This might be a different bug, but still very similar:)
- Add an mp4 to the Project Files.
- Drag the clip to Track 2.
- Click the Ruler so the Play-head is inside the clip, notice the Video Preview shows an image from the video at that point, notice the openshot process uses y% CPU for no reason. y = 103, 67 (depending on the clip)

[Andy Finch (fincha)]

It may appear to be for no reason, but for instance moving the play-head involves re-drawing portions of the timeline, and generation of the xml file that MLT needs to process the video.

[Alexandru Băluț (a13b)]

I changed the (Edit -> Preferences -> General ->) Output Mode to "sdl_preview", whatever that is, and OpenShot works fine now. After I start the application it uses 0% CPU, and when I drag a clip to the timeline and click the Ruler it uses 100% CPU for a few seconds, but then it stops.

What is the difference between "sdl" and "sdl_preview"?

[moimael (moimael)]

sdl has a better quality but take much more ressources where sdl_preview has a lower quality but takes less ressources.

[Alexandru Băluț (a13b)]

What exactly does "lower quality" mean? This should be explained in Help.

[Mario B. (boonekamp-deactivatedaccount-deactivatedaccount)]

Ubuntu 10.10 (32-bit), OpenShot 1.2.2

OpenShot _does_ use CPU for no reason. After opening a sample project and resizing/moving some effects I noticed that the fan of my notebook got faster and faster. The reason was OpenShot which used about 60-100% on both cores. I add a screenshot. I took it while OpenShot was completely idle. No playback or something.

[Zoubidoo (zoubidoo)]

Confirmed for
openshot 1.4.0-1 (from PPA) on Ubuntu 10.04 LTS i686
and
openshot 1.3.0-1 on Ubuntu 11.04 i686

[Zoubidoo (zoubidoo)]

This bug has been confirmed and should be critical priority because it makes openshot almost unusable.

Going to try the workaround suggested by Alex.

[Zoubidoo (zoubidoo)]

I can confirm that CPU usage is much more reasonable with output mode sdl_preview.

openshot 1.4.0-1 from PPA
libmlt2 0.5.4-1
Ubuntu 10.04 LTS

[Olivier Girard (eolinwen)]

THis bug will be resolved with our library libopenshot and so all the audio problem (sync, shutter,........).
But good point to see that he is not marked like hight priority. At least that a bug in double............

[Olivier Girard (eolinwen)]

Thanks for your participation in this shouting to find duplicate bugs.
Like there is another already marked, I mark it like duplicated.
Thx.