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Down-sampling in SV
Hello,
I have two timelines in SV 11:
the first contains both SD and HD (interlaced 1920×1080 / .mts format)
the second contains the above specified HD exclusively.
Both of these timeline clips are destined for DVD – meaning they will be rendered to 720×480 1.2121 (NTSC DV Widescreen) lower field first.
I’ve come across quite a bit of conflicting information as to the optimal methods to down-sample. I am of course seeking the best quality possible and I ask if anyone would be so kind as to offer me some suggestions.
PS – The aforementioned timelines contain a wealth of various media, FX, etc, in addition to the .mts clips; am I best off down-sampling each HD clip individually (outside of the timelines) or should I render each timeline, then downsample?
Thanks in advance!!
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15 Replies
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Just render to MainConcept MPEG-2 using the appropriate DVD Architect NTSC | PAL Widescreen video stream… template and then render your audio as Dolby Digital AC3 and you should be fine. Vegas Pro does an awesome job of figuring all of this downsampling stuff for you.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
John,
Thanks for the suggestion. I’ve already tried rendering directly from the SV timeline and I wasn’t happy with how the down-sampled footage appeared. For whatever reason(s) the interlacing is far more pronounced in the down-sampled footage than in the native SD footage – it is pretty noticeable.
I’ve read suggestions about using AV Synth and other 3rd party programs to improve the appearance of the down-sampling, but I’m unclear as to the best solution. I’d really like to try and get the best looking down-sampled possible.
Thanks again!
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[Steve Mason] “For whatever reason(s) the interlacing is far more pronounced in the down-sampled footage than in the native SD footage – it is pretty noticeable.”
What did you use to determine this? Did you watch the DVD on a TV and you saw interlacing?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
I made a test DVD with the down-sampled clips on it and played-back on a DVD player to a television (the intended destination for these clips).
As I’ve mentioned, the SD segments in the same clips looked fine, but the down-sampled segments appeared discernibly more “interlaced” (the separation of the fields appeared more prominent).
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Make sure you render using “Best” mode.
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It’s all I ever use.
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Oops! Sorry. Wrong thread. This is my confusion night!
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I used to do this on a regular basis. For your HD source video, did you set pan/crop to use the match output aspect so that the HD image is cropped to an SD size? If you have already done this, then my comment won’t help. If you have not done this, then you should. When you do, you can select the portion of the SD screen that you want to include so that you get the best possible image. In my experience, the quality of the HD video used in this way will exceed the quality of the SD video. That assumes, of course, that both the HD and SD are at comparable quality levels to begin with.
When you render, as others have said, Vegas will take care of the details. That should not be too hard since it is seeing, essentially, two SD images.
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[Steve Mason] “I made a test DVD with the down-sampled clips on it and played-back on a DVD player to a television (the intended destination for these clips). “
I’ve never seen any interlacing on any down samples clips from Vegas Pro so something must not be set correctly.
Can you post a screen shot of your Project Properties?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Bob,
Am I correct in understanding that I should set the width and height values (red outlined area in screenshot) to 720×480 in order for DV to properly down-sample?
This would not work for me as I need the full contents of the clip – not just a portion of it. I sure hope this isn’t the only solution or I am in trouble.
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