• VEGAS Pro

  Smart render for MPEG2 does not work

  Posted by Libor Jendele on March 15, 2013 at 2:02 pm

  Hi,

  I have a problem with smart rendering in Vegas Movie Platinum V. 11.
  I want to cut and join some mpeg files from my Sony HDD recorder and produce output without re-rendering.

  I create a new project, set its property to match the edited test.mpg file, (PAL 720×576 25fps interlaced, upper frame first, audio ac3 256kbits/s stereo, video mpeg2, video bitrate about 6Mbits/s.
  Then I import the testing test.mpg file.

  Thereafter, without any editing, I do Render_As, check “match project setting”, choose Main Concept MPEG2, Program stream PAL, press customize template and change Field order to Upper field first and render (without setting anything else).
  It re-renders the test.mpg, i.e. no smart rendering occurs. the result is test1.mpg

  I tried to adjust as close as possible output bitrate for audio and video to that in test.mpg, changed field order…, but no success.
  I believe that params in Render As have the same frame size, fps, field order, … as that in test.mpg.

  Nevertheless, when I do exactly the same, but now I edit and rend the file test1.mpg, (i.e. the file previously created by Vegas), the command Render-As does smart render, as required and the out test2.mpg is produced very quickly.

  Simply, my problem must be that the properties of test.mpg does not match close enough propertes in RenderAs template. Or, only some mperg2 file can be smart rendered by the Main Concept Mpeg2 template. Can you help my how to set the Custom Settings Main Concept MPEG-2 dialog to math test.mpg? Clearly the match is not only about frame size…. as stated in the Vegas’s Help. Is it somehow possible to release necessary math of the params?

  Of course, I can send a sample test.mpg, if it is of any help, (or I can upload it somewhere on the web. I checked all params by test.mpg->Property info window and these match those in RenderAs template. The discrepancy must be somewhere deeper in the file….

  Thanks for your help.

  Libor

  Libor Jendele replied 13 years, 2 months ago 3 Members · 6 Replies
• 6 Replies

• 

  John Rofrano

  March 16, 2013 at 11:39 am

  Unfortunately, creating a render template that matches exact enough to enable smart rendering is a black art. According to the help file:

  In order to perform smart rendering, the width, height, frame rate, field order, profile, level, and bit rate of the source media, project settings, and rendering template must match.

  All I can offer is to double check that these settings match exactly. I’m guessing that the profile that your camera uses does not match the profile of the render template.

  I would make a Sony Product Suggestion to add a feature to match render settings like it does for matching project settings. (BTW, I’ve made this suggestion so if more people could maybe Sony will consider implementing it)

  ~jr

  http://www.johnrofrano.com
  http://www.vasst.com
• 

  Norman Black

  March 16, 2013 at 11:55 pm

  I like that idea. I’ll submit the suggestion also.
• 

  John Rofrano

  March 17, 2013 at 1:48 am

  Thanks Norman. The more people that do the better.

  ~jr

  http://www.johnrofrano.com
  http://www.vasst.com
• 

  Libor Jendele

  March 18, 2013 at 8:37 am

  Thanks for the reply. I wrote the appropriate suggestion, too.
  The current Vegas Mpeg2 smart rendering is (nearly) useless.

  In fact, I’d appreciate the same also for AVCHD Sony mts2 files, (1920×1080, 50/60p), but although I made similar suggestion already about 2 years ago, the result is nil. Hence, I’m quite sceptical… And it is even more surprising, as Vegas is now part of Sony Corp., and the free Sony PMB can do cutting and splitting without re-rendering for a long time.

  Seems to me that with Sony Vegas it’s the same story as with Adobe Premiere.
• 

  John Rofrano

  March 18, 2013 at 10:48 am

  I haven’t seen any NLE that smart renders AVCHD. I’m surprised that PMB can do this. I thought it was something about the encoding algorithm that made this prohibitive but I guess not. That would be awesome.

  ~jr

  http://www.johnrofrano.com
  http://www.vasst.com
• 

  Libor Jendele

  March 18, 2013 at 11:40 am

  It’s not full NLE editing. PMB can do just cutting and joining AVCHD files. Similarly Corel… But, it should suffice…

  Vegas could automatically render clips with some Video FX and more complicated editing to some temporary files and then to split/join them with the rest of the timeline…, (something that works in Vegas already for HDV material).

  In fact, if Vegas can reliably render to *.mts files, using PMB you can do all the above manually already now. The problem is that Vegas claims to be able to render to mts, but the created files are often corrupted and not compatible with original Sony MTS files. Then, PMB fails to work with them.

  Again, it’s funny (or rather sad). Sony created AVCHD 2.0 format and uses it for its camcorder. Sony Vegas nevertheless reliably supports mp4 that is used by Sony competitors, like JVC, Panasonic… and its own AVCHD2 *.mts does not work properly.

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