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Problems with multiclip playback

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Roberto Aloi
Problems with multiclip playback
on Jul 5, 2011 at 12:03:36 pm

I have a multiclip made of two Apple ProRes 422 clips. I double-click the multiclip in the browser, so it appears in the viewer. In the viewer, I set the playhead sync to "Video", since I want to keep the audio from one single clip and swap just the video for the angles. I set an IN point for the multiclip in the Viewer and "Insert" it in the timeline. So far so good. The multiclip is in the timeline and nothing needs to be rendered. Just, on the RT menu (top-left corner of the timeline) there are only a few options instead of the standard ones: Play Base Layer only, use playback settings and full quality. No option for "multiclip playback".

I change the playhead sync to "open" in the viewer. I can see it is updated in the canvas as well. I select the timeline and jump to the beginning. I start playing. At this point, I would expect the two angles to play in the viewer, but they are still. As soon as I stop playing the sequence, the two clips in the viewer update to the current ones. While playing, I can use the keyboard shortcuts to cut to the different angles, so that when I stop playing I can actually see the cuts in the timeline. Just, it is very hard to make the cuts without seeing both cameras simultaneously. If I try to switch between angles by clicking on the respective clips in the viewer, the sequence just stops playing.

What am I doing wrong?


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Jerry Hofmann
Re: Problems with multiclip playback
on Jul 5, 2011 at 12:28:58 pm

The frame rates, and frame sizes as well as the codec of both clips have to be identical... they likely aren't. Read my reply to the earlier thread you started.

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

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Roberto Aloi
Re: Problems with multiclip playback
on Jul 5, 2011 at 12:41:57 pm

The only difference I can spot is the data rate: 6.8 vs 7.3 MB/s. Frames per second, codec and frame size are identical.


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Roberto Aloi
Re: Problems with multiclip playback
on Jul 5, 2011 at 1:21:51 pm

I've just duplicate one of the two clips, so I have a multiclip made out of the same clip. Still the same problem. The multiclips in the viewer do not play. Then, it's not a matter of different size or codec. Any other idea?


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Roberto Aloi
Re: Problems with multiclip playback
on Jul 5, 2011 at 1:57:49 pm

I think I found the cause of the issue:

http://documentation.apple.com/en/finalcutpro/professionalformatsandworkflo...

"Although the Apple ProRes format itself supports virtually any frame size, the Final Cut Pro RT Extreme real‑time effects architecture supports the following Apple ProRes frame sizes only:..." 1024x768 is not there...


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Jerry Hofmann
Re: Problems with multiclip playback
on Jul 5, 2011 at 2:39:32 pm

That's it... must conform it to a supported RT extreme size which is standard video sizes...

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

Current DVD:
http://store.creativecow.net/p/81/jerry_hofmanns_final_cut_system_setup

8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX - Cinema Displays I have a 22" that I paid 4k for still working. G4 with Kona SD card, and SCSI card.


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