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Ivan Myles
May 4, 2013 at 7:47 pm in reply to: What P-frame interval does Premiere use for exporting H.264?

[Ivan Myles] “It’s showing the same GOP structure with M=1 (IBP) for both Main and High profiles at Level 5.1.”

To correct my previous post, M=1 corresponds to an IP structure with no B-frames. MediaInfo defines M as the distance between two anchor frames (I and P). I previously thought it was the AME definition of the number of B frames between anchor frames.

So it appears Premiere Pro does not use B-frames for H.264 exports.
Ivan Myles
May 4, 2013 at 8:46 am in reply to: Key Frame Distance=2 frames yields file size 32% of All-Intra?

[Angelo Lorenzo] “All-I is a full discrete image every frame.”

That is why I don’t understand how reducing the number of I-frames by 50% reduces the file size by 68%. Consider one second of 24fps video:

24I = 50Mb
12I + 12B = 16Mb

Even if the B-frames don’t require any space, wouldn’t the remaining 12 I-Frames require 25Mb on average? Bit rate was not a constraint (300Mbps target) so why would the I-frames be compressed like this?
Ivan Myles
May 4, 2013 at 3:42 am in reply to: How to work with/convert a 1 fps file for PP CS5?

Please provide the file extension, audio codec, and video codec for the source files. (VLC info should show the codecs.) Do the synch issues exist if the files are opened in After Effects or Adobe Bridge?
Ivan Myles
May 4, 2013 at 3:32 am in reply to: How to do a “Dip to Black” with a more analog (less linear) feel?

You could use the Luma Corrector effect and keyframe the Gain independently for each tonal range.
Ivan Myles
May 4, 2013 at 1:11 am in reply to: What P-frame interval does Premiere use for exporting H.264?

Thanks for the tool. It’s showing the same GOP structure with M=1 (IBP) for both Main and High profiles at Level 5.1.

Format/Info : Advanced Video Codec
Format profile : Main@L5.1
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=12

Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=12
Ivan Myles
May 4, 2013 at 12:58 am in reply to: Output 5.1 clip without stereo mix down?

You’re welcome. Glad to help.
Ivan Myles
May 3, 2013 at 11:53 pm in reply to: What P-frame interval does Premiere use for exporting H.264?

Great info. Thanks!
Ivan Myles
May 3, 2013 at 10:17 pm in reply to: Output 5.1 clip without stereo mix down?

Was the sequence created with 5.1 audio? Here is a tutorial:
https://www.youtube.com/watch?v=Dg-4PJ1mhfI

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Ivan Myles
May 3, 2013 at 6:58 pm in reply to: Need to change codec without conversion. xdcam to h264

– Do you have the original XDCAM files from the camera?
– What is the file extension and codec of the files produced by XDCAM Transfer?
– What version of Premiere Pro are you using?

Premiere Pro supports multiple file formats within the same sequence. There is no need to transcode if the source files can be imported. Some formats will work more smoothly than others, though.

As Kris mentioned, H.264 is not an ideal codec for editing. Premiere Pro will work with it, but transcoding from another format to H.264 for editing is not recommended.
Ivan Myles
May 3, 2013 at 5:40 pm in reply to: Need to change codec without conversion. xdcam to h264

It is my understanding that XDCAM is MPEG-2, so you won’t be able to generate an H.264 file without transcoding. The .mov format does not support MPEG-2, so you can’t just change the wrapper to create a QuickTime file.

Are you planning to edit the footage or do you just want playable copies? XDCAM files can be imported to Premiere Pro CS6 for editing. Even if you export as MPEG-2, the files will be re-encoded.

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