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field problem when exporting to MPEG IMX
I’m making versions of some shorts which I’m sending to Singapore via ftp. The codec they have asked for is MPEG IMX 625/50 30Mb/s. So what I’ve done is export an uncompressed 8 bit quicktime onto my hard drive and transcode to the MPEG IMX format using Compressor.
Having sent the first batch in Singapore, I’ve had a message to say that the picture is all jittery on movement and the description really indicates to me that the fields are being played back in the wrong order in each frame. Now, when I open the files in FCP and look at the settings, it’s showing the field dominance as being Upper(Odd). Is that correct? and if it isn’t does anyone know a way of changing it as there doesn’t appear to be that option in either the export settings in FCP or in Compressor for that codec?
I’m using FCP 7.0.3 and Commpressor 3.5.3 and I’m relatively new to it (using it for about a year and a half), but having been a long time Avid user and tape before that, I’m pretty technically aware although obviously not expert in this instance.
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6 Replies
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Hi Andrew,
Go to the Audio/Video Preferences and, in the “Sequence Preset”, have a look to the IMX specs and see the standard field order for that format .
If your original footage has the opposite field-order, you must invert this.
rafael -
Thanks, the IMX specs there are for Upper(Odd) and I’ve got footage in DVCPRO50-PAL which shows up as Lower(Even). How do I change it?
The odd thing is that it plays back perfectly on a grade 1 monitor via the blackmagic box as it is.
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[Andrew Rendell] “The odd thing is that it plays back perfectly on a grade 1 monitor via the blackmagic box as it is.”
This shouldn’t be like that, but I can not point any reason of this behave.[Andrew Rendell] “Thanks, the IMX specs there are for Upper(Odd) and I’ve got footage in DVCPRO50-PAL which shows up as Lower(Even). How do I change it?”
In Compressor you have to set “Frame Control: ON” and in “Output fields; Upper”.
rafael -
Thanks for the advice. I’m trying that now. Incidentally, in the frame control section in Compressor “Upper” isn’t an option, but “Top First” is, so I assume that’s the same thing.
I’m slightly disconcerted that it says that it’s going to take 3 hours to do, when it took about 20 minutes to do it without changing the field dominance, is that normal?
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[Andrew Rendell] “Thanks for the advice. I’m trying that now. Incidentally, in the frame control section in Compressor “Upper” isn’t an option, but “Top First” is, so I assume that’s the same thing. “
Right.[Andrew Rendell] “I’m slightly disconcerted that it says that it’s going to take 3 hours to do, when it took about 20 minutes to do it without changing the field dominance, is that normal?”
Andrew, when you activate the “Control Frame”, things get slower, but is the only way Compressor makes a decent job.
However, think that you are exporting to an MPEG-2 format and that is always slow.
rafael -
Just coming back to the thread to say thanks, that fixed it.
Plus I flipped the resize and deinterlace filter to the quickest settings (as I’m not resizing or deinterlacing) and the processing speed went down to something more reasonable.
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