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Best Practices for Converting HD PAL File to NTSC DVD
Hi Everyone,
We have a 1920x1080i PAL file that we are authoring to an NTSC DVD. What is the best practice for accomplishing this goal? I have several scenarios and wanted some feedback:
1. Convert PAL Pro-Res to NTSC Pro-Res, then create NTSC MPEG2
2. Convert PAL Pro-Res to NTSC MPEG2There is also the question of fields and how they differ in an HD vs SD conversion. The file has an Upper field, but DVDs are lower field. Here are the scenarios:
1. Upper Field HD file to Lower Field MPEG2
2. Upper Field HD file to Progressive MPEG2
3. Upper Field HD file, deinterlaced, to Lower Field MPEG2
4. Upper Field HD File to Progressive file, to Lower Field MPEG2I’m curious as to what the best answer is regarding these scenarios so we can make the best DVD we can.
Thanks for any suggestions,
Cristian
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1 Reply
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Chris,
the usual way is as follow if you start with PAL SD upper field:1. deinterlacing
2. retiming/conforming from 25fps to 23.98fps (slow down by4%)
3. resizing 720×576 to 720×480
4. encoding to MPEG2 using a 23.98-setting, which will end up into MPEG2 29.98 NDF.I would use Apple Pro Res for the entire workflow up to the encoder.
to use interlaced material could lead to terrible problems when doing a software-only format-conversion.
IF you need to have same duration, you need to create new frames using an adaptive engine with motion-vector-analysis. this will take VERY long time or come within an external hardware.
for internatinal distribution it´s a common way to use conforming for format-conversion especially if you are talking about blu-ray, but it´s similar for DVD as well.
the only difference is, that blu-ray could play 1080p23.98 or 1080p24, while SD DVD only could playback 25 or 29.98fps.
danny
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