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25 to 29.97
Hi,
I have a HDV sequence with 25 fps editing timebase that I wish to put on a 29.97 NTSC dvd.
I have achieved a decent downrez by exporting a uncompressed file at 25 but I am having problems converting this file to 29.97. I use Cinema Tools to conform it to 29.97 but when I use compressor to re-time the clip back to the original length the quality goes right down – I have frame controls on best.
I read that I could make 25 into 23.98 (using Cinema Tools) and then drop this into a 29.97 timeline but this method does not retime it.
I am really frustrated as I had a workflow that worked fine for HDV (PAL) to SD NTSC but for some reason it is not working for this sequence! Its driving me nuts.
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6 Replies
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[Brendan Pyatt] “I use Cinema Tools to conform it to 29.97 but when I use compressor to re-time the clip back to the original length the quality goes right down – “
You Conform and them convert.
This makes no sense for me.There are two ways to go 25 to 29’98.
– You use a program (FC, Compressor, MPGSTreamlip, AE,..) to create 4’98 new frames per second.
– You Conform to 23’98 and you add Pulldown.
Rafael -
Thanks,
So doing this:
“- You Conform to 23’98 and you add Pulldown”
How do I add Pulldown? I have the clip as 23’98 and it looks fine but when I drop it into a 29.98 timeline the clip stays at the same length – not the same as the original 25 sequence. -
Hi Brendan,
When you conform, the only thing you do is that your p25 footage is read at 23’98 fps.
The footage gets slow down a 4%.
You don’t have to worry about this.
This slow down is impossible to detect by the eye.
With the audio in certain cases, certain people with very good hering could tell the differnce in pitch of the audio. Mostly with music you would need to pay more attention.
Normally people conform and forget about the audio.
The clips, of course, will be a 4% longer than the original.
rafael -
[Brendan Pyatt] “How do I add Pulldown?”
Your video capture card may be able to do this. Consult the manual, or let us know what capture card you have in your system – one of us might have what you have…
You can also achieve this in software with Compressor. Much better to do it in hardware though – try that route first.
[Brendan Pyatt] “the clip stays at the same length – not the same as the original 25 sequence.”
You slowed it down by conforming it to 23.98fps. If you want it to stay the same length as your 25fps cut but be 29.97fps, your only true hope is a hardware standards converter like Teranex makes. Compressor can achieve results, but they pale in comparison.
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“When you conform, the only thing you do is that your p25 footage is read at 23’98 fps.
The footage gets slow down a 4%.”
The sequence is set to music so I really need to get the video back to the say duration as it was in the 25 timeline – could i just speed it up in Twixtor or something? -
[Brendan Pyatt] “could i just speed it up in Twixtor or something?”
Yes.
But if you have to process the footage in Twixtor, it may be better that you go from 25 to 29’98 directly.
Yu should make a test for the quality and the rendering time.
rafael
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