Issues with Size of FLV VBR 2-pass vs 1-pass Encoding in CS6

Hey Everyone,
I've been doing some testing on various systems (using either Windows 7 or Windows 8 Consumer Preview) using Premiere Pro CS6 as well as Media Encoder 6 and I've noticed that encoding FLV files using VBR 2-pass encoding produces a file that is significantly larger than the same source file encoded using just a VBR 1-pass.
For example, one test that I ran used 10 seconds of DVCPRO HD 720P 29.97 footage as source material. I exported all clips exported as .flv, 960x540 square pixels, 29.97 fps, 1000 kbps and everything else left at default settings.
Here were my results:
Size of Export via Premiere Pro CS5 VBR 1pass: 1.564 MB
Size of Export via Premiere Pro CS5 VBR 2pass: 1.618 MB
Size of Export via Premiere Pro CS6 VBR 1pass: 1.450 MB
Size of Export via Premiere Pro CS6 VBR 2pass: 3.622 MB
Eric Addison of 100 Acre Films also ran a similar test on his system and got these results:
Encoding 10 secs of a P2 AVC-I 1280x720, 29.97 clip using the same settings as above to FLV
Premiere CS6 Export VBR 2 pass – 2.87 MB
Premiere CS6 Export VBR 1 pass – 1.55 MB
AME 6 Export VBR 2 Pass – 2.85 MB
I've tested this out with short clips, ~3 min sequences, raw clips, and clips with lots of effects, and I continue to get consistent results with the VBR 2-pass file being anywhere from 30% up to 300% larger than the same clip encoded using just 1-pass encoding. Again, this doesn't occur using Premiere Pro CS5 or 5.5 (or AME 5), so it appears to be just an issue within CS6.
Would anyone else be willing to run a similar test using their system and own source files and post your results in this thread to determine if this is a system-wide issue or just flukes?
Thanks!
Kevin Tostado
Tostie Productions

Just checking if there's any progress on this?
We're having a similar problem, I just made a bug report. -
Concise problem statement:
With CS6, rendering Flash Video files using AME creates files that are unuseable. They have bad flickering, and look like files that have been encoded with half the bitrate. This happens on all of our cs6 workstations, and has been happening since we moved to cs6. Our workaround is to render the file to a 30mbps H264 file, then open cs5.5 media encoder and transcode it to flash, where it renders them perfectly, as it used to! This is happening on projects where there have been no changes at all between cs5.5 and cs6 - we can render exactly the same timeline out of premiere pro in cs5.5 and it looks fine, then in cs6 it looks like crap.
Steps to reproduce bug:
Render an on2 vp6 flash video out of premiere pro.
Results:
Any parts of the video with gradients or hard colour contrast will look like crap, either blocky or blurry, like it's been encoded at a super low bitrate.
Expected results:
This is happening on all sorts of projects - stuff with titles generated in premiere pro, stuff with PNG files in it, stuff with sony EX1 footage, with segments of uncompressed video rendered in after effects,... basically everything.
Since filing the bug report, I've read this thread and worked out that like you guys it does only happen for us with 2 pass encoding. So at least now we have a better workaround than transcoding, we can just export in 1 pass. I don't like having to do that. Yes, probably loads of people can't tell the difference between 1 and 2 pass and blah blah blah other codecs are better, we all know that! We have to use on2 VP6, for lots of annoying reasons, one big one being that we have a lot of corporate clients who put our videos on their intranet, and don't let their staff update their media players, browsers, OS's etc. - so the only video they can reliably use for everyone is an on2 VP6 file. Anyway, would be great to have a fix, we're only just making back all the time we lost from having to transcode all our Sony EX1 footage that premiere pro cs6 couldn't deal with (that tearing issue is now fixed, thank f*ck). I doubt I'm going to be able to justify spending loads of money on upgrading to cs7 when it comes out after all the bugs we've had to deal with in this one.

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