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"Proxy" Clips for HD editing

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cedricp
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"Proxy" Clips for HD editing

Tue Apr 14, 2009 10:57 am

Hi,


I'm using Kdenlive with clips in 1080P from my camcorder, but previewing is very slow (frames drop, etc.).


So I was wondering if it was possible to use a "proxy" clip (very downscaled), and tell Kdenlive to use it for editing, but keep the 1080P original file for export.


Just an idea ...


 


Cheers.

KoRnholio8
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Re: "Proxy" Clips for HD editing

Tue Apr 14, 2009 11:45 am

I would also like to see this feature, especialy because of AVCHD.



animationista
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Re: "Proxy" Clips for HD editing

Thu Apr 23, 2009 7:59 am

I would also like to see proxy editing in Kdenlive.


I'm using 1920-x1080 png-sequences.  I do animation so there's no reason to go to compressed low quality intermediate format. But the downside to this is that Kdenlive is quite slow in handling the files.


Using proxy editing would be a great help here.

overunity_drupal
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Re: "Proxy" Clips for HD editing

Fri Apr 24, 2009 4:36 pm

I need a proxy too! Actually I have about 50 hours of AVCHD material, which I need to edit "yesterday". Please consider adding a proxy as soon as possible, so I will be able to switch over from "Paymere". I asume you are already working on it right now, so I feel free to thank you in advance for releasing this unpayable feature! Keep up the good work!

ddennedy
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Re: "Proxy" Clips for HD editing

Tue Apr 28, 2009 12:32 am

For now, you can help by making some attempts or tests. Transcode your clips keeping a file-namimg rule or pattern. Then, edit with the transcoded clips. When done editing, save it as a westley XML file. Next, edit the XML file in a text editor to point to all of the original files. Finally, add the XML file as a clip, put it on the timeline, and and render. Please report your results for others. I expect there will be issues with the positioning in composites.



eduardo_drupal
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Re: "Proxy" Clips for HD editing

Thu May 07, 2009 1:05 am

Hello,


Thanks a lot for the above tip. I used it with a slightly different purpose. I made a project with AVCHD source files. When rendered, there were some issues due to (I think) problems in AVCHD handling in kdenlive. Namely some black frames between clips and some clips replaced by gray screens.


So I batch converted all my AVCHD files to high bitrate MPEG4 files as an intermediate format and I used the procedure you described to re-render my project, which worked great.


Now I want to go further and be able to continue editing the project. In other words, I would like to open the altered XML file for editing in kdenlive and be able to rearrange clips, etc. instead of inserting the XML file as a clip into a new top-level project, which makes it a single big uneditable block.


When I tried to do that, kdenlive crashed. Is it possible to do some more modifications to the XML file to make this happen? I see that it has codec information per clip, and since my clip's codecs changed, I suspect that's what kdenlive is not handling very well...


Eduardo

ddennedy
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Re: "Proxy" Clips for HD editing

Fri May 08, 2009 8:55 pm

 Kdenlive can not open MLT XML as a project - that is too raw for its liking at the moment. Instead of saving as a .westley file as I described above, you should try copying/editing the .kdenlive file. I merely suggested using .westley because that is a more concise format - less to edit.



eduardo_drupal
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Re: "Proxy" Clips for HD editing

Fri May 08, 2009 10:11 pm

I actually did edit the .kdenlive file. I thought that was what you referred to as a westley file, since it's all in a "westley" html tag.


Do you think it would work if I just remove the codec format tags?

ddennedy
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Re: "Proxy" Clips for HD editing

Sun May 10, 2009 6:33 pm
> Do you think it would work if I just remove the codec format tags?

No. I do not know what went wrong. You'd have to try to look at this further and see if you overlooked something. I am sorry, I can not take the time to look at this right now.


gab3d
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Re: "Proxy" Clips for HD editing

Mon Aug 30, 2010 6:59 pm
Proxy clips is a very useful feature, and seemingly a seriously needed one for HD editing in kdenlive.

Perhaps there could also be some performance to be gained if kdenlive allowed for a lower resolution preview of HD files?
I know it's not the same but if the bottleneck is on the video card data processing, perhaps it'd help to send less data to it (i.e. lower resolution data of the HD video) for previewing purposes.

Just an idea...
j-b-m
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Re: "Proxy" Clips for HD editing

Mon Aug 30, 2010 8:09 pm
We are currently preparing Kdenlive 0.7.8, so no big changes in the next weeks, but editing with proxy clips is one of the important features I want to implement for Kdenlive 0.8.
gab3d
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Re: "Proxy" Clips for HD editing

Tue Aug 31, 2010 2:49 am
good news!
thanks for sharing them with us :)
LeHomard
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Re: "Proxy" Clips for HD editing

Tue Aug 31, 2010 2:34 pm
In the meantime, don't forget to always transcode your AVCHD files to DNxHD. It will take up a lot of disc space (and the time to transcode...), but it edits really fine on a farily recent computer.

The problem with HD video editing isn't so much the high resolution and bitrate, but is mostly just AVCHD decoding issues...


KoRnholio8
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Re: "Proxy" Clips for HD editing

Tue Aug 31, 2010 5:13 pm
Great news!


jakemuse
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Re: "Proxy" Clips for HD editing

Tue Dec 07, 2010 5:00 am
Yes, also interested in this. Subscribing!


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