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marker accuracy problem with m2v file

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alain pire
marker accuracy problem with m2v file
on Mar 13, 2013 at 2:55:36 pm

Hi,
I made a live musical film and I want to transcode it onto DVD.
I used FCPX and I exported it to a .mov file (166Gb) - put it into Encore, set my markers ...and everything went fine.
But after checking the video quality on a TV screen, I decided to try to improve it, so I sent the .mov file into Compressor 4 and got a m2v file.
Back into Encore, I cannot set my markers precisely, it leaves a gap between timeline bars and I cannot set it precisely where I want, which is annoying because I need markers to start right a the beginning of a song.
Thanks
Alain


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Roel Bus
Re: marker accuracy problem with m2v file
on Mar 14, 2013 at 2:58:16 pm

Hi Alain,
m2v files are long GOP files, with (depending on your settings, but the default is) an i-frame every 15 frames. That means twice a second. The rest of the frames are interpretive, either forwards or backwards. They do not contain all the information like the i-frames do.
After encoding, Encore does not let you put a marker on anything other than an i-frame, so you can't do frame accurate marking anymore.
That's one reason why markers can not be put where you want it.
Hope this helps,
Roel


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alain pire
Re: marker accuracy problem with m2v file
on Mar 14, 2013 at 3:28:26 pm

Thanks Roel,
So I think that I'll stick to my original uncompressed .mov file which allows me to put markers on a frame basis
Alain


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