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Multi-machine Capture System - TreetWiki

Multi-machine Capture System

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(An Important Additional Stage)
(An Important Additional Stage)
=== An Important Additional Stage ===
=== An Important Additional Stage ===
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If you take a file recorded by Wirecast and run it up in the file analyser in Fina Cut Pro (Tools -> Analyse), you will discover an interesting thing: FCP will note that there appear to have been dropped frames. Looking at the error list it will show a (large) number of frames with different lengths. Telestream, who market Wirecast, say that what Wirecast does is to vary the frame duration to ensure smooth motion, that what you see in the analyser is actually fine, and that in a given period you will get around the correct number of frames - they just won't all be same same duration. The less charitable way of putting it is that what's actually happening is that WC is dropping frames and they're not admitting it – but in any event, this way of handling dropped frames (by making the duration of the adjacent frame equal its duration plus that of the dropped frame) is actually the correct way to do it.  
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If you take a file recorded by Wirecast and run it up in the file analyser in Final Cut Pro (Tools -> Analyse), you will discover an interesting thing: FCP will note that there appear to have been dropped frames. Looking at the error list it will show a (large) number of frames with different lengths. Telestream, who market Wirecast, say that what Wirecast does is to vary the frame duration to ensure smooth motion, that what you see in the analyser is actually fine, and that in a given period you will get around the correct number of frames - they just won't all be same same duration. The less charitable way of putting it is that what's actually happening is that WC is dropping frames and they're not admitting it – but in any event, this way of handling dropped frames (by making the duration of the adjacent frame equal its duration plus that of the dropped frame) is actually the correct way to do it.  
Whatever the explanation, ''do not try using these files direct in Final Cut Pro'' as there will be resulting duration errors and edits will appear to mysteriously move about. Instead, ''fix the files first'' by running them through Compressor with the same settings as they came in with so it can clean them up.  
Whatever the explanation, ''do not try using these files direct in Final Cut Pro'' as there will be resulting duration errors and edits will appear to mysteriously move about. Instead, ''fix the files first'' by running them through Compressor with the same settings as they came in with so it can clean them up.  

Revision as of 08:05, 28 July 2011

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