Another Bitrate question at DVinfo.net

Peter Manojlovic · January 11th, 2010, 09:22 PM

I'M AT MY WIT'S END!!!!!

I'm trying to upload to youtube...
Here's my initial scenario..
I'm encoding a .MOV format, with the .H264 codec, and AAC for Audio...
The sample clip is 7:48 sec, and i'm using 128 kbps audio..

I'm trying to target a 1000MByte upload, by using the Bitrate Calculator. Of course the final result is 17376 kbps.
But the real world output is 1.22MBytes...

Whey using the Sorensen Squeeze codec, this issue goes away...

Since i'm on CS2.0, and using the Matrox Media encoder, is it possible that the .H264 codec is an older version, or i'm somehow getting the video padded unnessecarily?

Here's a snapshot...
Thank you.

Viktor Carlquist · January 12th, 2010, 02:02 AM

Misread post, sorry

Perrone Ford · January 12th, 2010, 02:48 AM

Looks like you're over by the bitrate of your audio. So compensate the video rate by 128 Kbps.

Peter Manojlovic · January 12th, 2010, 06:28 AM

Hey, thanks Perrone.....

That's what i though initialy.

But unfortunately, the Audio is in kbps, therefore, it doesn't even put a dent into the 22% over targeted upload....
Again, it's only with the h.264 codec. Sorensen Squeeze3 keeps the correct targeted filesize..

What a pain!!!

Robert M Wright · January 12th, 2010, 09:19 AM

Your numbers look all goofy. For example, you don't want a 1GB (1000MB - as you put it, 1000MByte) file as a result, do you? (17Mbps H264 is massive overkill for 640x360 video on YouTube.)

Seth Bloombaum · January 12th, 2010, 11:12 AM

Agreeing with Robert here - the numbers are so whacky they may be breaking the encoder.

A really good quality MP4 bitrate for SD that you might try just to create a benchmark for your workflow: 1.8Mbps. (1800Kbps)

Try that - it may be all you need.

Peter Manojlovic · January 12th, 2010, 11:22 AM

Ughhh....
I wanted to take advantage of the 1gig filesize, and upload what was an HD video originally..I've got my head stuck in the MPEG2 clouds, thinking that every bitrate counts..
I keep forgetting that h.264 is a differrent animal..

It totally makes sense..I'll play around with some more realistic settings..The slide scale of the video bitrate threw me off. Why is it scaled to such large values?

Thanks for the kick in the arse..

January 11th, 2010, 09:22 PM	#1
Peter Manojlovic Major Player Join Date: Jun 2007 Location: Hamilton Ontario Posts: 769	Another Bitrate question I'M AT MY WIT'S END!!!!! I'm trying to upload to youtube... Here's my initial scenario.. I'm encoding a .MOV format, with the .H264 codec, and AAC for Audio... The sample clip is 7:48 sec, and i'm using 128 kbps audio.. I'm trying to target a 1000MByte upload, by using the Bitrate Calculator. Of course the final result is 17376 kbps. But the real world output is 1.22MBytes... Whey using the Sorensen Squeeze codec, this issue goes away... Since i'm on CS2.0, and using the Matrox Media encoder, is it possible that the .H264 codec is an older version, or i'm somehow getting the video padded unnessecarily? Here's a snapshot... Thank you. Attached Thumbnails

January 12th, 2010, 02:02 AM	#2
Viktor Carlquist Regular Crew Join Date: Apr 2004 Location: Stockholm (Sweden) Posts: 30	Misread post, sorry Last edited by Viktor Carlquist; January 12th, 2010 at 02:15 AM. Reason: Delete

January 12th, 2010, 02:48 AM	#3
Perrone Ford Inner Circle Join Date: Nov 2006 Location: Tallahassee, FL Posts: 4,100	Looks like you're over by the bitrate of your audio. So compensate the video rate by 128 Kbps. __________________ DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.

January 12th, 2010, 11:12 AM	#6
Seth Bloombaum Inner Circle Join Date: Sep 2003 Location: Portland, Oregon Posts: 3,420	Agreeing with Robert here - the numbers are so whacky they may be breaking the encoder. A really good quality MP4 bitrate for SD that you might try just to create a benchmark for your workflow: 1.8Mbps. (1800Kbps) Try that - it may be all you need. __________________ 30 years of pro media production. Vegas user since 1.0. Webcaster since 1997. Freelancer since 2000. College instructor since 2001.

January 12th, 2010, 06:28 AM	#4
Peter Manojlovic Major Player Join Date: Jun 2007 Location: Hamilton Ontario Posts: 769	Hey, thanks Perrone..... That's what i though initialy. But unfortunately, the Audio is in kbps, therefore, it doesn't even put a dent into the 22% over targeted upload.... Again, it's only with the h.264 codec. Sorensen Squeeze3 keeps the correct targeted filesize.. What a pain!!!

January 12th, 2010, 09:19 AM	#5
Robert M Wright Inner Circle Join Date: Jan 2006 Location: Minnesota (USA) Posts: 2,171	Your numbers look all goofy. For example, you don't want a 1GB (1000MB - as you put it, 1000MByte) file as a result, do you? (17Mbps H264 is massive overkill for 640x360 video on YouTube.)

January 12th, 2010, 11:22 AM	#7
Peter Manojlovic Major Player Join Date: Jun 2007 Location: Hamilton Ontario Posts: 769	Ughhh.... I wanted to take advantage of the 1gig filesize, and upload what was an HD video originally..I've got my head stuck in the MPEG2 clouds, thinking that every bitrate counts.. I keep forgetting that h.264 is a differrent animal.. It totally makes sense..I'll play around with some more realistic settings..The slide scale of the video bitrate threw me off. Why is it scaled to such large values? Thanks for the kick in the arse..