Determine compression ration of finished DVD at DVinfo.net

Vince Pachiano · June 21st, 2013, 05:49 PM

Is there any way to determine the compression ratio used to render an already burned DVD-R?

Don Bloom · June 21st, 2013, 09:19 PM

You might be able to get kind of close. What's the total length of the running video? what type of audio...AC3 or PCM (wav)? Most would be AC3 which give a smaller file and allows a higher bitrate for the video. Once you know the total run time of the video and knowing that a standard DVD-R is actually less than 4.34 gigs due to formatting of the disc you should be able to get close to the BR used.
For example if the total run time of the video is 105 minutes and the audio is AC3 then the average BR would probably be somewhere around 5,542,200 using a VBR. If the audio were PCM the average would be 4,167,000 so as you can see it's quite a difference. Also if you have a motion menu vs. a static menu you need to allow a bit of room for that.
As you can see,without knowing specifics it's kind of a somewhat educated guess at best.

Andrew Smith · July 24th, 2013, 01:38 AM

You could try playing it back in Media Player Classic or VLC and using their info options to look at the data rate. You can also try placing a .vob file in to PremierePro and looking at the stats for the video file to see if it tells you what you want.

Andrew

Juris Lielpeteris · July 31st, 2013, 11:27 PM

Open corresponding *.VOB file in MediaInfo (text mode) and You will get something like

Quote:

Bit rate mode : Variable
Bit rate : 3 458 Kbps
Maximum bit rate : 7 000 Kbps

and many other usefull information.

June 21st, 2013, 05:49 PM	#1
Vince Pachiano Major Player Join Date: May 2008 Location: Dayton, OH Posts: 307	Determine compression ration of finished DVD Is there any way to determine the compression ratio used to render an already burned DVD-R?

June 21st, 2013, 09:19 PM	#2
Don Bloom Inner Circle Join Date: Jan 2003 Location: Chicago, IL Posts: 6,609	Re: Determine compression ration of finished DVD You might be able to get kind of close. What's the total length of the running video? what type of audio...AC3 or PCM (wav)? Most would be AC3 which give a smaller file and allows a higher bitrate for the video. Once you know the total run time of the video and knowing that a standard DVD-R is actually less than 4.34 gigs due to formatting of the disc you should be able to get close to the BR used. For example if the total run time of the video is 105 minutes and the audio is AC3 then the average BR would probably be somewhere around 5,542,200 using a VBR. If the audio were PCM the average would be 4,167,000 so as you can see it's quite a difference. Also if you have a motion menu vs. a static menu you need to allow a bit of room for that. As you can see,without knowing specifics it's kind of a somewhat educated guess at best. __________________ What do I know? I'm just a video-O-grafer. Don

July 24th, 2013, 01:38 AM	#3
Andrew Smith Equal Opportunity Offender Join Date: Feb 2009 Location: Brisbane, Australia Posts: 3,015	Re: Determine compression ration of finished DVD You could try playing it back in Media Player Classic or VLC and using their info options to look at the data rate. You can also try placing a .vob file in to PremierePro and looking at the stats for the video file to see if it tells you what you want. Andrew