How to estimate post rendered file size? at DVinfo.net

Sean Seah · January 1st, 2006, 02:18 AM

Recently I made an 120min footage which rendered to 4Gb. As I was worried it cant fit on a single disk, I cut some footages but it turned out unnecessary. R we able to pre-determine the rendered mpeg2 size for rendering?

Peter Jefferson · January 1st, 2006, 02:53 AM

http://www.videohelp.com/calc.htm

Edward Troxel · January 1st, 2006, 06:48 AM

I use the bitrate chart in Vol 1 #7 of my newsletters. Just vary the bitrate as needed for the length of your video and all should be fine.

Sean Seah · January 1st, 2006, 08:29 AM

So manual calculation is reqwuired but thaz better than nothing. Thanks!

Gary Kleiner · January 1st, 2006, 11:05 AM

You can only get an estimate, because files created using VBR encoding are dependant on the content of the image.
For example, if there is less variation between frames (e.g a talking head vs. a soccer game), then there is less information that needs to be encoded which results in a smaller file size.

Gary

Colin Rayner · January 2nd, 2006, 01:32 PM

Just while we are on this subject, if in DVD Arch the estimated project size is 6.3gig, yet the mpg and ac3 only add up to 3.2gig and the main title page only has 1 animation and a static scene selection, what's going on? The project is 56 min long with not alot of sound or graphic animation etc.
to get it to fit on a DVD I would have to optimize to fit quite heavily on the audio.........I have had a good read of Ed's Vol1 No7 and still can't find what's going on with this project.
Have I missed something?

Edward Troxel · January 2nd, 2006, 01:58 PM

That happens sometimes. DVDA isn't always the best at guessing the size. If you KNOW it's small enough, go ahead an prepare it ignoring the warnings. Then check the sizes of the final VIDEO_TS files to see how big the result really is. I, too, have seen it estimate double size.

Colin Rayner · January 2nd, 2006, 02:15 PM

Thanks Ed, It just didn't make sense. One more thing, the AC3 file was orphaned and I don't know why. It has a different file name than the mpeg, but it did drag and drop ok and in preview you do get the sound. After the render, the Audio TS file was empty.............

Gary Kleiner · January 2nd, 2006, 03:06 PM

The AC3 file ia automatically associated when it has the same root name and is in the same directory.

The Audio_TS folder is always empty.

Gary

Edward Troxel · January 2nd, 2006, 03:08 PM

The Audio_TS file is supposed to be empty. The audio on your DVD is included in the VOB files.

January 1st, 2006, 02:18 AM	#1
Sean Seah Trustee Join Date: Sep 2005 Location: Singapore Posts: 1,498	How to estimate post rendered file size? Recently I made an 120min footage which rendered to 4Gb. As I was worried it cant fit on a single disk, I cut some footages but it turned out unnecessary. R we able to pre-determine the rendered mpeg2 size for rendering?

January 1st, 2006, 06:48 AM	#3
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	I use the bitrate chart in Vol 1 #7 of my newsletters. Just vary the bitrate as needed for the length of your video and all should be fine. __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

January 2nd, 2006, 01:32 PM	#6
Colin Rayner Regular Crew Join Date: Jan 2004 Location: Geraldine, NEW ZEALAND Posts: 88	Just while we are on this subject, if in DVD Arch the estimated project size is 6.3gig, yet the mpg and ac3 only add up to 3.2gig and the main title page only has 1 animation and a static scene selection, what's going on? The project is 56 min long with not alot of sound or graphic animation etc. to get it to fit on a DVD I would have to optimize to fit quite heavily on the audio.........I have had a good read of Ed's Vol1 No7 and still can't find what's going on with this project. Have I missed something? __________________ "We don't have any money, so we will have to think" Ernest Rutherford

January 2nd, 2006, 02:15 PM	#8
Colin Rayner Regular Crew Join Date: Jan 2004 Location: Geraldine, NEW ZEALAND Posts: 88	Thanks Ed, It just didn't make sense. One more thing, the AC3 file was orphaned and I don't know why. It has a different file name than the mpeg, but it did drag and drop ok and in preview you do get the sound. After the render, the Audio TS file was empty............. __________________ "We don't have any money, so we will have to think" Ernest Rutherford

January 2nd, 2006, 03:08 PM	#10
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	The Audio_TS file is supposed to be empty. The audio on your DVD is included in the VOB files. __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

January 1st, 2006, 02:53 AM	#2
Peter Jefferson Inner Circle Join Date: Apr 2003 Location: Aus Posts: 3,884	http://www.videohelp.com/calc.htm

January 1st, 2006, 08:29 AM	#4
Sean Seah Trustee Join Date: Sep 2005 Location: Singapore Posts: 1,498	So manual calculation is reqwuired but thaz better than nothing. Thanks!

January 1st, 2006, 11:05 AM	#5
Gary Kleiner Regular Crew Join Date: Jan 2004 Location: Fort Collins, Colorado Posts: 166	You can only get an estimate, because files created using VBR encoding are dependant on the content of the image. For example, if there is less variation between frames (e.g a talking head vs. a soccer game), then there is less information that needs to be encoded which results in a smaller file size. Gary

January 2nd, 2006, 01:58 PM	#7
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	That happens sometimes. DVDA isn't always the best at guessing the size. If you KNOW it's small enough, go ahead an prepare it ignoring the warnings. Then check the sizes of the final VIDEO_TS files to see how big the result really is. I, too, have seen it estimate double size. __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

January 2nd, 2006, 03:06 PM	#9
Gary Kleiner Regular Crew Join Date: Jan 2004 Location: Fort Collins, Colorado Posts: 166	The AC3 file ia automatically associated when it has the same root name and is in the same directory. The Audio_TS folder is always empty. Gary

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