Low bitrate confusion

I have a question about bitrate that I'd love some help with...
My source video is 1080p using a Canon 6D. In Premier Pro CS5 my project sequences are set to HDV 720p30, as I intend to export at 720p.
My export settings are:
NTST, 1280x720, 29.97fps, Progressive AAC 320kbps, 44.1 hKz, Stero
VBR, 2Pass, Target 6Mbps, Max 8 Mbps.
Square Pixels, Baseline Profile, Level 3.2
Everytime I render my movie, the resuting mp4 shows a bit rate of about 3200 kbps. Even if I select CBR / 6 Mbps I still get roughly 3000 kbps out.
Why so low? Wouldn't you expect something between the Target and the Max bitrate? My "movie" content is a video of someone drawing a picture, so a lot of frames are blank white-paper until the drawing progresses - so I guess there is a lot of potential for compression, but still seems really low.
Should I be using 1080 for my sequences and exporting at 720 instead? The source files at 1080p are showing a bitrate of approximatley 31,470 kbps.
Thanks for any pointers!
Cheers,
-Brett

Just for grins, I set up 1080i HDV in a 720p sequence. I trimmed the clip to 10 seconds and exported six times.
Each time I used VBR 2 pass, 6 to 8Mbps. The first three I used level 3.2 and the second three I used 4.2
For each level I used baseline, main and high. I chose a clip without much movement. I was just getting the camera set up, but it seemed like using a low motion video was appropriate for this example.
The results surprised me a bit. The file sizes ranged from 7587K (four of the files) and there was one at 7569K and one at 7571K.
According to MediaInfo, the bitrate remained pretty constant at 6007Kbps (four of them) and 5993K, 5992K. The low end of the scale, but not surprising for a low motion video on a tripod.
Unfortunately, my eyes are not good enough to tell the difference in the quality of the clips either. I would have thought it would be more obvious. I guess I need to research profiles and levels. I can tell you that when I tried to move up to 4.2 the software decided I needed to be using 1080p so I had to manually change the frame size again.
Just to make sure that the blank white frames were not the issue, I added 10 seconds of a white color matte. This time the High, 4.2 came out to almost exactly twice the file size and MediaInfo says it is 6022Kbps. Why it is a higher bit rate is a mystery to me, but one I will have to figure out at a later date unless we can get someone like Kevin to pitch in and straighten me out.
So, Brett, there is no reason that I can see that your bitrate should be that low. Which leads me to ask how you are measuring it? Can you post a screen grab of the export settings?

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How do I get my laptop to receive a proper bitrate?
Just tell me if you need further information.
Regards
Last edited by manuelschneid3r (2013-08-08 18:24:25)

Strike0 wrote:To your problem: The bitrate reported should change depending on net load or link quality.
If you're link is fairly good, it will go up when you download/stream something. It goes down to save power when the bandwith is not needed (or there are wifi troubles, like a bad link quality or interfering signals).
Well I'am embarrassed. This obviously "solved" the nonexistent problem. I encountered this low bitrate due to conky. (<- is this correct english?) ( http://i.imgur.com/moT6CJ3.jpg ) I watched this value a long time, assuming that it would never change. My fault was to believe that it's static, and as long as I am wired via Ethernet, there's no need for the wireless interface to do any action. The only problem was me, blaming intel for stuff I didnt know
Thank you WonderWoofy and Strike0 for starting me off.
**EDIT**
Shame on me! I just stumbled upon a thread in which WW was telling me the same just 3 months ago. I should try this Ginkgo stuff
Regards
Last edited by manuelschneid3r (2013-08-08 23:47:55)

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