Changing speed of tracks doesn't work

[Adam]

1) Ubuntu 9.04
2) openshot_wizard_1.0.4
3) OpenShot 0.9.4

I've just tried speeding up and changing direction of tracks. The clip shortens accordingly on the timeline but when I play the track it just displays a still image of the clip in the preview screen. I've rendered the movie to see if it was just an issue with the preview screen but the rendered movie just plays backs as an empty clip. I've tried it with both avi and mpeg clips and the same thing happens for both.

I've also tried slowing down the clip. This appears fine in the preview screen but again when I render the clip it just plays as an empty movie for the duration of the clip. Additionally I've tried rendering a video clip without any changes and it just renders the sound only.

[Helen McCall (wildnfree)]

I haven't had the time yet to test this on 0.9.4 because I am working on the Help Manual.

I did test it out fairly thoroughly on 0.9.3 yesterday and submitted some bug reports.

I tested the speed control using mp4 and AVCHD clips. Changing direction is very buggy as Jonathan pointed out, so I did not concentrate on that, but acknowledge I was unable to play render anything with direction change.

When I speeded up or slowed down clips, I was able to render them beautifully. But if I imported the rendered clips I had the same problem you had if I tried to change the speed on them.

eg; I rendered a 1/7 speed clip, and then re-imported the slowed down clip, and tried to speed it up 7x to see if this would result in a normal speed clip again. But after speeding up this rendered clip, I was unable to play it, and when subsequently rendered it only rendered the first frame running all through the length of the rendered clip.

Therefore in rendering the slowed down clip, something changed in the format or codec to make it impossible to change the speed a second time.

Where did the clips you used originate from?

What previous processing had you done on them?

Helen McCall

[Jef Damen (jef-damen)]

Hi Jonathan
I can confirm that I have exact the same problem when I change the speed or direction as Adam discribed in his bug.
Kind regards
Jef

Ubuntu 8.10
Openshot 0.9.20

[Jonathan Thomas (jonoomph)]

I've changed the speed value to be locale-aware, which should fix this for some people. However, I still believe some of the problem comes from a bug in MLT.

[Jef Damen (jef-damen)]

Hi Jonathan
I just tried version 0.9.21 but I only can slow down the speed.
I didn't try this in an earlier version so perhaps this was also working before.
Speeding up and reversing stil don't work.
Bye
Jef

[markba (mark-baaijens)]

I can confirm this on 0.9.22:
- reverse direction does not work
- speed up does not work
What works is slowing down.

When working with Kdenlive (v 0.7.3 on Jaunty), I also encountered that reversing direction was not working there also. Since Openshot is using the same lib (MLT), it seems probable the problem is located there.

[Helen McCall (wildnfree)]

Hello Markba

Yes, I can confirm that because I have tested it on all versions of
OpenShot, and on kdenlive versions 0.73 and the new 0.75.

On Thu, 2009-08-27 at 21:07 +0000, markba wrote:
> I can confirm this on 0.9.22:
> - reverse direction does not work
> - speed up does not work
> What works is slowing down.
>
> When working with Kdenlive (v 0.7.3 on Jaunty), I also encountered that
> reversing direction was not working there also. Since Openshot is using
> the same lib (MLT), it seems probable the problem is located there.
>

[Vadim Peretokin (vperetokin)]

This is still an issue in OpenShot 0.9.42. In the preview at least, I can't seem to be able to export because it crashes.

[Vadim Peretokin (vperetokin)]

Actually, it crashes *because* I spedup a clip. Without speedups, it does not crash and exports ok.

[Vadim Peretokin (vperetokin)]

Well, its peculiar, because when I tried exporting, cancelled, then speeding up - it worked in the preview. So it's working sometimes... by default, doesn't seem to be.

[Vanessa Lee (vanessax)]

This may be related to https://bugs.launchpad.net/bugs/506663

The problem is when will it be fixed in MLT?