This IS the Avid L2: Re: [Avid-L2] Sony A7 camera recording formats?

Saturday, March 18, 2017

Re: [Avid-L2] Sony A7 camera recording formats?

You've received good replies, but my two cents. It's really simple these days.

Almost all camera codecs are MP4 based. MP4 is a fantastic codec. If you are on modern hardware, or you are shooting "cinema quality" you don't need to consider anything else.

Modern NLE's and hardware handle MP4 long-GOP well. Most "current" hardware has MP4 acceleration. Avid was, indeed, slow to the party, but you should not have a problem on modern hardware, Mac or PC.

Choose the highest bitrate available in a format your NLE will handle natively. In my opinion, 100Mbps is the lowest acceptable long-GOP bitrate for full 1080p "broadcast quality" work.

Opinion:

I always edit native. Hear me, Avid? Always. Life is too short for intermediates.

Always "10-bit" when possible. 8-bit sucks. Always has. Always will.

Always progressive at 29.97 (if your hardware is limited) or 59.94 if you've got the horsepower.

Cheers,

tod

Tod Hopkins
Hillmann & Carr Inc.

On Mar 18, 2017, at 1:09 PM, dvcinlv@gmail.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

AVC is simply a higher Level/Profile of MPEG-4. AVC is simply newer.

AVCHD is of course AVC, but at very low bit rates -- so avoid.

AVC-S and AVC are simply Long GOP versions "AVC. "There is TODAY no editing difficulties with editing Long GOP. This myth is kept alive by those who have a near zero understanding of compression. The order of compressor IPB output has nothing to do with the order the IPB frames are written to files.
Specifically, codecs write frames to files in the order they will be needed during decode. If there is a B frame the codec already has the needed I or P frames.

Quality is equal on all frames blowing another myth. That's why every IPB frame also has a frame of error correction data.

Moreover, for a given data rate limit Long GOP provides higher quality.

AVC-I does solve the problem of not cutting on a GOP boundary. It also needs higher data rates – try 4K at 422 onto an SD card. The only reason to transcode is because most NLE companies will not use NVIDIA GPU cards to do the decode. They try to get away with a CPU and multiple threads. Many buyers don't even know an i5 doesn't support multiple threads aren't and CPUs are not getting faster: i7700 vs i6700. (Also not more than 12 threads are supported so 6-cores are enough—but check multi-core performance.)

Simply select the highest bit rate codec. If AMA doesn't support it. That might be a hint—because h.265 is coming along fast for 6K and 8K cameras.

Best Regards,
Steve Mullen

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Posted by: hoplist@hillmanncarr.com

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