Cutting at 1080p 23.98 – JPEG compression???

[Shane Ross]

I don’t think you’ll get any RT effects…or darn few. That is why many people capture as DVCPRO HD 720p24…same data rate…5.7MB/s, but you get many RT effects, and it looks REALLY nice.

Shane

Littlefrog Post
http://www.lfhd.net

[Sean Oneil]

[makkystyle] ”
I am cutting a film that is being shot on F900’s at 1080p. I want to cut at a reduced filesize and noticed that my BlackMagic MultiBridge Pro has a JPEG capture setting (at 1920×1080 23.98). Capturing some test footage I found that (with no audio) it has a data rate of 5.7MB/s!!! It looks great and is incredibly small as far as file sizes.

My question: Is there any reason why I should NOT use this codec to cut in? It seems almost too good to be true and I haven’t read anywhere else about people using this codec to work with so before I start capturing, I wanted to run it by you guys.”

Couple things.

1. Make sure the quality slider for P-JPEG is 75%. Blackmagic improperly set it at 25% for HD. They may have fixed this or not. Double check both capture and sequence settings to make sure its 75%.

2. You get no RT Extreme by default. But there is a way to modify a FCP startup script (discovered by yours truly 🙂 that will give you RT Effects when working with P-JPEG. Search “RT Enabler” in the Blackmagic forum. It’s about a year or two old.

Sean

[Todd Makurath]

Thanks for the heads up Shane… I will do some tests.

Here’s another question for you (which I thought I knew the answer to but now am not sure)… I am setting up my capture presets and in the compression choices there is:

DVCPRO HD 720p50
DVCPRO HD 720p60

I thought this was the fields (either PAL or NTSC) but then there is also a Framerate choice of 23.98.

Any thoughts?

[Shane Ross]

720p50 is PAL….720p60 is NTSC. 23.98 is 24fps, and is an NTSC format.

720p24 is the setting I’d use if I were you.

Shane

Littlefrog Post
http://www.lfhd.net

[Todd Makurath]

Thanks again Shane… I am digitizing from 1080p HDCAM tapes and there does not seem to be a way to capture at 720p24. I am using the BlackMagic Multibridge pro and absolutely tearing my hair out. Are you familiar with this setup?

I would love to have the smaller filesizes of 720 and then online back to 1080 but it just seems impossible through the Multibridge Pro. I’m pretty frustrated right now, because I want to be able to preserve space on my RAID.

[Shane Ross]

Blackmagic HDTV 720p 23.98 Varicam 8 bit…try that one.

Shane

Littlefrog Post
http://www.lfhd.net

[Todd Makurath]

That one got me to drive all the way back to Westwood. I couldn’t believe that I wouldn’t have tried something that simple. So now I am here and remembering that I went through that step earlier.

The problem with this is that your source must be in that format, not what you want to capture to. The only way I am able to get any video signal recognized in Log and Capture is when the “Capture/Input” drop down matches the incoming video i.e. 1080p23.98 It will capture this in 10-bit, 8-bit, DVCPRO, JPEG… but there appears to be no way to compress the resolution as well.

[Gary Adcock]

[makkystyle] “I am digitizing from 1080p HDCAM tapes and there does not seem to be a way to capture at 720p24. I am using the BlackMagic Multibridge pro and absolutely tearing my hair out. Are you familiar with this setup?”

Sorry
but your BMD card cannot do a cross conversion of 1080 to 720.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

[Mike Most — account bouncing, bad address]

The only card that can currently cross convert between 1080 and 720 on the fly is the Kona 3. Blackmagic cards cannot perform that conversion.

[Shane Ross]

[gary adcock] “but your BMD card cannot do a cross conversion of 1080 to 720.”

Ahhh….I didn’t know that BMD cards couldn’t do that.

Shane

Littlefrog Post
http://www.lfhd.net