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Issues with video quality from Apple Pro Res to IMX50
We are ingesting video from tape (BetaSP) using a Sony DVW-A500 to produce Apple Pro Res 422 HQ in Final Cut Pro and are encountering quality issues when we convert the resulting Apple Pro Res 422 HQ file to IMX50 (as requested by a client). The IMX50 files display shakiness and motion artifacts when they are laid back to tape. Is there any way to correct that? Also, we are seeing a 30% drop in file size for the Apple Pro Res from when we capture the video from tape to after we perform minor edits on the Apple Pro Res 422 HQ file and export out of FCP (prior to converting the file to IMX50). Is that pretty typical?
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7 Replies
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What format are you recording to tape? Are you laying back to BetaSX? And one more question… Why are you converting your timeline before writing back to tape?
You must have some sort of capture card. Why not let that card send the video to your tape deck? Codecs don’t matter in this case. I can lay a ProRes422 to any format thru our AJA Kona 3 card.
Ok… One more question….
Why did you capture BetaSP into ProRes422 HQ? That’s serious overkill. Your video will not look any better than regular ProRes422. ProRes422 HQ is made primarily for program that are mostly graphics and resolutions higher than 1920×1080. I realize you want the best quality, but its not going to make you video look any better that it already is on tape.
Work with codecs that match your best video compression.
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Wayne Carey
Schazam Productions
https://web.mac.com/schazamproductions
schazamproductions@mac.com -
Our client is requesting both Apple Pro Res 422 HQ and IMX50 as their file outputs. We are using a Blackmagic Decklink HD card.
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How are you making the IMX50 file?
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Well… That answers that…
Compressor NEVER does a good job with converting to XDCAM or IMX codecs. The best method of making an IMX50 file would be to output your timeline to a tape and then capture that tape at IMX50.
I know… you hear everyone saying that this will degrade your project, but trust me, it works much better than Compressor.
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Wayne Carey
Schazam Productions
https://web.mac.com/schazamproductions
schazamproductions@mac.com -
We are making the IMX50 in Final Cut.
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We’ve used compressor many times over to compress from UC or Pro Res to IMX50 with zero issues. Sounds like either the frame rate is off or somehow the video is being re-sized.
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[Melanie Price] “We are making the IMX50 in Final Cut.”
So you export a ProRes, reimport, then add that ProRes file to an IMX50 timeline?
You are aware that ProRes is 720×486 in NTSC and IMX50 is 720×480, right?
FC should move your 486 movie down one pixel it he Motion tab automagically when adding a ProRes file.
If your IMX50 timeline is 720×486, then that might be your issue.
Jeremy
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