• VEGAS Pro

  Re:Rendering – Is it a black art?

  Posted by Dave Fromme on October 23, 2009 at 10:11 am

  Thanks Jay, Stephen, Dave and Ben for your replies.

  Jay: DVD Aspect ratio is 4:3, anamorphic can have a DAR of 16:9.

  Sorry, your comment is a little over my head. I’m rendering/encoding/compressing using MPEG-2 16:9 in Vegas; dropping the resulting file into DVDA where the ‘Make DVD’ settings are also 16:9. I just don’t understand why DVDA needs to do anything to an MPEG-2 compliant file.

  Stephen: Is there a reason that you need the video media in separate files? Try making a single MPG/AC3 set. I suspect that this is your problem.

  I used a single MPEG-2/AC3 file originally and was advised to try separate MPEG-2 and AC3 files.

  Stephen: BTW, you don’t “render” MPG and AC3, they are encoded, notwithstanding that Vegas puts both render and compression tools in the “render as” menu.

  Thanks.

  Ben: I have used the render to DVDA file in the MPEG2 options and found this to give the second best visual results. Actually I was doing things that way for years until “working in the lab, late one night, my eyes beheld a mysterious sight”… and I accidentally dropped an .avi file into DVDA.

  “Bu%%er”, I thought. “It will take ages” especially after the accidental render to .avi was pretty fast. The time taken wasnt much different from the MPEG2 render… and then I noticed the crisper vision. So now my workflow has changed. Clicking on the “interleave every frame” ensures fx such as glint and light rays are smooth, and Vegas does not have to recompress any of the existing .avi files on the timeline.

  Ditto! But the resulting rendered/encoded file is far too large. I feel I need to get to the bottom of why MPEG-2 is causing me problems.

  Dave: Get back into DVDA, with all of your clips as before.

  Go to the “File/Optimize Disc…” dialog. Presumably, you see check marks next to the audio, signs next to the video, as before.

  Check the global settings, over on the right in that dialog. It should say something like:

  Disc format: DVD
  Video: MPEG-2, 16:9, 720×576 (PAL), 25
  Audio: AC-3 Stereo, 192kbps

  The above checks out.

  Dave: Next, select your first video clip. Click the “Video 1” tab over on the right, look where is says “Recompress Required”, and expand that. Below it’ll give you “Reasons for required recompression”. For example, if I put a 24p progressive (NTSCfilm) video into just such a PAL project, DVDA will tell me here, “NTSC Media is incompatible with PAL project”.

  Ah ha! The ‘Reasons for required compression’ are…

  a) Six videos say – Reduce interlace flicker is on
  (I had been advised to use this where the screen has text.)

  b) The main menu, which has a video background, says Asset contains composited graphics and Reduce interlace flicker is on

  c) Then I have three menus that have a png file file as a background. These are used as a kind of information page which the viewer can read. The pages only have a ‘Main Menu’ link that the viewer can use to return to the Main Menu when they’ve read the text. The ‘Reasons for required compression’ are Media is not compliant with the disc format, Video format doesn’t match project, and Asset contains composited graphics

  Thanks Dave! At least I’ve got some reasons now as to why DVDA is re-compressing the files. I just need to understand what the reasons mean and what action to take!!

  Dave Fromme replied 16 years, 6 months ago 1 Member · 0 Replies
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