Q. i was going to buy a Sony HD Camcorder ? and a Green Screen and Software for it now i was wondering if you have too have a special camera?
A. yep any camera will work it will look better as well because its HD
iMovie: How do I synch 'green screen' background with the foreground?
Q. I have had success with the 'green screen' on iMovie, except synching is difficult. Often the background will appear a few frames before the scene change. You can slide the scenes around, but this often changes other things. Precision Editor seems to only complicate things. Is there a feature to iMovie that will synch them?
A. This might be related to the codecs which the Event clips have been compressed with. The popular codecs MPEG-4 and H.264 use so-called 'interframe' compression methods, which means that to decode one frame, the editing software has to include another keyframe in the calculations. This steps up the complexity of the necessary calculations, and it can also bog down the editing software (playback and clip skimming gets choppy/not instantly responsive.) Moreover, precise frame-by-frame editing might get difficult, especially with additional effects.
So, check if the clips are compressed with these editing-unfriendly MPEG-4 or H.264 codecs (open them as files in QuickTime Player and press Cmd-i to display the specs.) If they are, transcode them using a editing-friendly codec. To do this, use MPEG Streamclip. Download it, open the video files with it and choose File->Export to QuickTime. In the options window, choose 'Apple Intermediate Codec' from the drop-down menu, select the Frame Size that says '… (unscaled)' and click on 'Make Movie'. The resulting file will be 4 to 8 times larger than than the MP4/H.264 file, so make sure you have plenty of space left on the hard drive. When done, import the files in iMovie and remove the old clips.
MPEG-Streamclip is freeware: http://www.squared5.com/svideo/mpeg-streamclip-mac.html
The Apple Intermediate Codec is already installed on your Mac (QuickTime component) if iLife/iMovie is installed. iMovie uses it when importing HD video directly from camcorders. It's an 'intra-frame' codec where all frames can be processed without using another keyframe.
http://support.apple.com/kb/HT2704?viewlocale=en_US
UPDATE:
In iMovie '11 you can use 'File >Optimize Video > Full Original Size' to transcode an already imported event clip. So you don't have to go through MPEG Streamclip. The original file will not be erased but moved into a new folder that iMovie creates within the Movies folder, named iMovie Original Movies.
So, check if the clips are compressed with these editing-unfriendly MPEG-4 or H.264 codecs (open them as files in QuickTime Player and press Cmd-i to display the specs.) If they are, transcode them using a editing-friendly codec. To do this, use MPEG Streamclip. Download it, open the video files with it and choose File->Export to QuickTime. In the options window, choose 'Apple Intermediate Codec' from the drop-down menu, select the Frame Size that says '… (unscaled)' and click on 'Make Movie'. The resulting file will be 4 to 8 times larger than than the MP4/H.264 file, so make sure you have plenty of space left on the hard drive. When done, import the files in iMovie and remove the old clips.
MPEG-Streamclip is freeware: http://www.squared5.com/svideo/mpeg-streamclip-mac.html
The Apple Intermediate Codec is already installed on your Mac (QuickTime component) if iLife/iMovie is installed. iMovie uses it when importing HD video directly from camcorders. It's an 'intra-frame' codec where all frames can be processed without using another keyframe.
http://support.apple.com/kb/HT2704?viewlocale=en_US
UPDATE:
In iMovie '11 you can use 'File >Optimize Video > Full Original Size' to transcode an already imported event clip. So you don't have to go through MPEG Streamclip. The original file will not be erased but moved into a new folder that iMovie creates within the Movies folder, named iMovie Original Movies.
Powered by Yahoo! Answers
Tidak ada komentar:
Posting Komentar