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Using Apple’s Compressor to Export HD MPEG2 with CBR
I’m not very familiar with streaming content for an internal TV channel but I’ve been put in a place where I have to.
I’m using the newest version of Apple’s Compressor and having some difficulty.
I have to get a video uploaded to an MPEG-2 format with a constant bit rate (CBR). My transitions are jumpy every time I use VBR. The video also needs to be in HD. However, it won’t let me select CBR when I try to export HD. It only allows me to use CBR when exporting NTSC standard def.
Anyone have any suggestions of the best way to export?
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9 Replies
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What kind of mpeg-2 are you trying to encode – an elementary, program, or transport stream? What are the delivery specs? Is a bit rate specified?
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN
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I’m trying to get 25 Mbps. It’s a 30 minute loop for an internal TV channel and I’ve never done anything like this.
I believe it is a program stream.
I’m compressing it from a FCP QT movie.
Is that what you needed?
Thanks for putting up with my ignorance.
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Did you make a program stream at 25Mbps and saw the dissolve issue while playing that back? How did you monitor the playback?
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN
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I first did HD 2 pass VBR since it won’t let me do CBR for HD. For that I used 30 Mbps. The way we stream is we have a server and it goes to a modulator to the TVs in our facility.
The guys who installed it are based in Washington and they are the ones that told me to make it CBR and they don’t know either.
I monitored it on several TVs after I put it on the server and it was jumpy then.
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Hi Nathan,
Setting “Stream Usage: Generic” and selecting Transport or Program Stream you should be able to use CBR ans set the data-rate as you need.
You don’t need to do an “HD DVD” MPEG-2. That’s not what you need.
rafael -
Rafael, I tried to set CBR (Generic Stream Usage) with a Program Stream using an HD source (DVCPro 720P (23.98) and the CBR option was grayed out. I could only set CBR with a SD source.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN
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Hi John,
Did you tried from FC or a self-contained?
I’ll give a try with some XDCAM.
rafael -
From self-contained.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN
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Check your field dominance of FCP timeline. The reason why the transitions are jumpy is because those areas are being rendered to the field dominance of your timeline and other footage without effects plays back fine. What is happening is your transitions are being rendered with the incorrect field dominance compared to the footage you are placing in the timeline. If you go into Final Cut and then under Sequence then Settings change the field dominance to upper or if it is already upper try lower.
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