Hello Avid-Community,
maybe some of you can help me with my problem:
I´ve got a Canon XF100 an the MC 5.5. The camera is making MXF Containers with MPEG2 inside. It´s quite easy to import the material (e.g. uncompressed 1:1MXF).
My Problem is, that I want to export the material in the same format and quality. If I try to export the timeline “same as source” without doing a mixdown the window „Long GOP media cannot be exported using same as source...” appears. – Maybe you know the problem…
So I am doing a mixdown and choose as compression for the mixdown also 1:1MXF. Then I can export it easily “same as source”.
But the problem is: The original size of the material when I was importing it was 80MB. After doing mixdown and exporting “same as source” it changed into 2,3GB! How can that be?
Thanks a lot for your replies!
moriti
The XF100 does not record 1:1 mxf files it records 25,35,or 50mbps Long-GOP MPEG2 files which Avid appears to handle natively.
It is no surprise that actual 1:1 files are considerably larger. Transcoding to DNxHD145, 175 or 220 should be more than sufficient to maintain quality. Still larger than your source, but not 1:1 uncompressed.
I think partly because when you mix down the material, you are losing the benefit of smaller file size gained by using Long GOP compression. Media Composer is 'filling in' the intermediate frames in each GOP, which before contained only partial frame information, with the complete frames. Hence, larger file size.
ok I understand. I gonna import the footage with DNxHD220 in future...
Can you recomend anything how to export the material in the best quality which is possible? Maybe without mixdown
FWIW, DNx145 is generally good enough for broadcast.
Kenton VanNatten | Avid Editor (for hire)
"I am not obsessed... I'm detail-oriented"
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