HDV bandwidth specs, includes audio? at DVinfo.net

Ignacio Rodriguez · March 13th, 2005, 05:01 PM

When Sony says their 1080i HDV is 25 Mbps, does that include the audio? Similarly, when JVC says their "pro" HDV is 720p at 19 Mbps, is that just video or does it include the 4 tracks of audio?Anybody have more info on this?

Barry Green · March 14th, 2005, 12:22 AM

It's all-inclusive -- video, audio, timecode, everything. And HDV doesn't have 4 tracks of audio, it has two. The four channels were mentioned in relation to ProHD XE, which is apparently a new format (including higher bitrate). If JVC is extending the HDV specification in ProHD then they could incorporate more audio tracks, but that would make it incompatible with regular HDV.

Ignacio Rodriguez · March 14th, 2005, 06:59 AM

They are, and the question stands for that version of HDV as well. What I am trying to determine is the actual bandwidth for video that is left over after you strip audio from the stream, in both cases. Does anybody know the exact numbers? Is it the same thing for DV? Is 25 Mbps including audio?

Douglas Spotted Eagle · March 14th, 2005, 07:51 AM

If it's HDV, then the specified datarate would include audio. Even if it wasn't HDV, I can't imagine the datarate being spec'd wouldn't include audio.

Ignacio Rodriguez · March 14th, 2005, 09:44 AM

Ok. Good to know. Now, what would the separate data rates be for audio and video? I just want to build a comparative table of video and audio data rates for different formats and can't seem to find the specific info, only the combined data rates.

R Geoff Baker · March 14th, 2005, 10:39 AM

For DV, the 25mb spec is video only -- audio is on top of that. I'm not sure about HDV -- I think Adam Wilt spells it out on his site but the site is down ...

GB

March 13th, 2005, 05:01 PM	#1
Ignacio Rodriguez Contributor Join Date: Sep 2003 Location: Santiago, Chile Posts: 932	HDV bandwidth specs, includes audio? When Sony says their 1080i HDV is 25 Mbps, does that include the audio? Similarly, when JVC says their "pro" HDV is 720p at 19 Mbps, is that just video or does it include the 4 tracks of audio?Anybody have more info on this? __________________ Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.

March 14th, 2005, 06:59 AM	#3
Ignacio Rodriguez Contributor Join Date: Sep 2003 Location: Santiago, Chile Posts: 932	They are, and the question stands for that version of HDV as well. What I am trying to determine is the actual bandwidth for video that is left over after you strip audio from the stream, in both cases. Does anybody know the exact numbers? Is it the same thing for DV? Is 25 Mbps including audio? __________________ Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.

March 14th, 2005, 07:51 AM	#4
Douglas Spotted Eagle VASST Join Date: Jan 2004 Location: Stockton, UT Posts: 5,648	If it's HDV, then the specified datarate would include audio. Even if it wasn't HDV, I can't imagine the datarate being spec'd wouldn't include audio. __________________ Douglas Spotted Eagle/Spot Author, producer, composer Certified Sony Vegas Trainer http://www.vasst.com

March 14th, 2005, 09:44 AM	#5
Ignacio Rodriguez Contributor Join Date: Sep 2003 Location: Santiago, Chile Posts: 932	Ok. Good to know. Now, what would the separate data rates be for audio and video? I just want to build a comparative table of video and audio data rates for different formats and can't seem to find the specific info, only the combined data rates. __________________ Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.

March 14th, 2005, 12:22 AM	#2
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	It's all-inclusive -- video, audio, timecode, everything. And HDV doesn't have 4 tracks of audio, it has two. The four channels were mentioned in relation to ProHD XE, which is apparently a new format (including higher bitrate). If JVC is extending the HDV specification in ProHD then they could incorporate more audio tracks, but that would make it incompatible with regular HDV.

March 14th, 2005, 10:39 AM	#6
R Geoff Baker Major Player Join Date: Jan 2005 Location: Ottawa, ON Posts: 471	For DV, the 25mb spec is video only -- audio is on top of that. I'm not sure about HDV -- I think Adam Wilt spells it out on his site but the site is down ... GB