0001495: Add "reverse play" to clips

(0005247)
LeHomard (developer)
2010-06-02 12:21

Apparently the options exists in MLT :

http://mltframework.org/twiki/bin/view/MLT/Questions [^]

How to reverse a movie, e.g. have it playing backward?

    * Somewhat awkward: Create jpgs for each frame and make movie in reverse order
    * melt INPUT.VIDEO -consumer avformat:images%05d.jpg real_time=0
    * melt -group in=0 out=0 `ls -r` -consumer avformat:reverse.mpeg qscale=0.01 real_time=0
    * Warning: If the argument list gets to long this might not work?
    * The newer approach is to use the framebuffer producer and append '?-1' to the file name.

If the framebuffer producer approach works, how would this be best exposed in Kdenlive ?

I can imagine two possibilities :
- right-clic clip -> reverse
- reverse effect

(0005250)
ttill (developer)
2010-06-02 18:16

I think it should be done trough setting a negative speed in the speed effect or adding a checkbox "reverse".

(0005251)
ttill (developer)
2010-06-02 18:33

By the way: This option already exists in Openshot, so MLT shouldn't be the problem.

(0005422)
ghomem (reporter)
2010-07-30 02:57

Would be great to have this (either ways). Any idea of when this will reach kdenlive?

(0006406)
insaner (reporter)
2011-02-12 08:10

vote up.

(0007447)
Inopia (reporter)
2011-10-19 21:25

Steps to reverse a clip in kdenlive:
1. Select the bit you want to reverse
2. Export
3. Install openshot
4. Import exported bit to openshot
5. Reverse
6. Export from openshot
7. Import bit back to kdenlive
8. realize you should have disabled any filters before doing this and start from beginning.

I wish kdenlive had this feature. I don't think it's too uncommon for people to reverse clips.

(0008590)
ttguy (reporter)
2012-11-08 14:53

Me too - I wish kdenlive had this feature.

(0009072)
ttguy (reporter)
2013-01-09 15:04

So the clip jobs menu already calls melt to to the video stablise jobs.

And I have figured out that I can reverse a video at the command line with this command

melt -profile dv_pal_wide framebuffer:in_vid.dv?-1 -consumer avformat:reversed_vid.dv

apparently this type of command gives you a .mlt output
melt -profile square_ntsc framebuffer:input_video.mp4 reverse=1 -consumer xml:reversed_video.mlt

which you can load into the project tree and timeline. So the latter syntax would fit nicely in the the current clip jobs setup - as they also create .mlt files to load into project
So I reckon it should be pretty easy to add a reverse video clip job to the menu.

Notes
(0005247) LeHomard (developer) 2010-06-02 12:21	Apparently the options exists in MLT : http://mltframework.org/twiki/bin/view/MLT/Questions [^] How to reverse a movie, e.g. have it playing backward? * Somewhat awkward: Create jpgs for each frame and make movie in reverse order * melt INPUT.VIDEO -consumer avformat:images%05d.jpg real_time=0 * melt -group in=0 out=0 `ls -r` -consumer avformat:reverse.mpeg qscale=0.01 real_time=0 * Warning: If the argument list gets to long this might not work? * The newer approach is to use the framebuffer producer and append '?-1' to the file name. If the framebuffer producer approach works, how would this be best exposed in Kdenlive ? I can imagine two possibilities : - right-clic clip -> reverse - reverse effect

(0005250) ttill (developer) 2010-06-02 18:16	I think it should be done trough setting a negative speed in the speed effect or adding a checkbox "reverse".

(0005251) ttill (developer) 2010-06-02 18:33	By the way: This option already exists in Openshot, so MLT shouldn't be the problem.

(0005422) ghomem (reporter) 2010-07-30 02:57	Would be great to have this (either ways). Any idea of when this will reach kdenlive?

(0006406) insaner (reporter) 2011-02-12 08:10	vote up.

(0007447) Inopia (reporter) 2011-10-19 21:25	Steps to reverse a clip in kdenlive: 1. Select the bit you want to reverse 2. Export 3. Install openshot 4. Import exported bit to openshot 5. Reverse 6. Export from openshot 7. Import bit back to kdenlive 8. realize you should have disabled any filters before doing this and start from beginning. I wish kdenlive had this feature. I don't think it's too uncommon for people to reverse clips.

(0008590) ttguy (reporter) 2012-11-08 14:53	Me too - I wish kdenlive had this feature.

(0009072) ttguy (reporter) 2013-01-09 15:04	So the clip jobs menu already calls melt to to the video stablise jobs. And I have figured out that I can reverse a video at the command line with this command melt -profile dv_pal_wide framebuffer:in_vid.dv?-1 -consumer avformat:reversed_vid.dv apparently this type of command gives you a .mlt output melt -profile square_ntsc framebuffer:input_video.mp4 reverse=1 -consumer xml:reversed_video.mlt which you can load into the project tree and timeline. So the latter syntax would fit nicely in the the current clip jobs setup - as they also create .mlt files to load into project So I reckon it should be pretty easy to add a reverse video clip job to the menu.

Issue History
Date Modified	Username	Field	Change
2010-03-08 11:36	LeHomard	New Issue
2010-06-02 12:21	LeHomard	Note Added: 0005247
2010-06-02 12:21	LeHomard	Assigned To	=> LeHomard
2010-06-02 12:21	LeHomard	Status	new => acknowledged
2010-06-02 18:16	ttill	Note Added: 0005250
2010-06-02 18:33	ttill	Note Added: 0005251
2010-07-30 02:57	ghomem	Note Added: 0005422
2011-02-12 08:10	insaner	Note Added: 0006406
2011-10-19 21:25	Inopia	Note Added: 0007447
2012-11-08 14:53	ttguy	Note Added: 0008590
2013-01-09 15:04	ttguy	Note Added: 0009072

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