writing speed from camera

[mastera]

I want to record some Interviews with our new camera. Sony EX3. Our favoured format would be High Quality 1080 25MBitrates per sec (Progressive). Would there be real probs when writing to blueray disk when the writing speed is 36Mbs?

We also have the possiblity with an interlaced format at 50Mbitrates. That is of course also not 36Mbs.

Am I going to run into probs here?

[rogman]

Originally Posted by mastera

I want to record some Interviews with our new camera. Sony EX3. Our favoured format would be High Quality 1080 25MBitrates per sec (Progressive). Would there be real probs when writing to blueray disk when the writing speed is 36Mbs?

We also have the possiblity with an interlaced format at 50Mbitrates. That is of course also not 36Mbs.

Am I going to run into probs here?

Although I'm not burning my own Blu-ray discs yet, I am burning 1080P video from my Sony SR-11 to AVCHD format DVDs with no issues. I'm using the highest bitrate available and preserving the format on output.

[mastera]

Originally Posted by rogman

Although I'm not burning my own Blu-ray discs yet, I am burning 1080P video from my Sony SR-11 to AVCHD format DVDs with no issues. I'm using the highest bitrate available and preserving the format on output.

What do you mean by preserving the format on output??

burn rate: 36Mbs - Blueray
30Mbs - DVD

When I want to burn with my 25Mbs footage, I'm loosing therefore every second either 11Mbs or atleast 5Mbs.

I got a dvd with the new camera and the Introduction guy mentioned that this loss is bad and that it should be made up for in post production.

Im just wondering how bad is this loss exactly? And what exactly can be done in post production?

Any ideas??

[odin24]

I don't think burn rate affects video quality, unless you are burning at extremely fast rates. Since most BD burners are still fairly low you should be OK. I have burned 35 mb/s material to BD without any issues at 2x... whatever that translates to in terms of data rate.

During post production I'm assuming how you go about compressing or recoding your material would affect the final output. As long as you use a good encoder, an efficient one like h264, you should be fine.

[rogman]

Originally Posted by mastera

What do you mean by preserving the format on output??

That I'm outputting the 1080P video to AVCHD formatted DVDs. Didn't want to imply that I was just outputting as 480P (DVD resolution) as would be the case if I were writing plain old DVDs.

When you're talking about 'burn rate', I think you're referring to transfer bit rate? This is measured in Mbps and is the rate the data can be transferred from the HDD (or BR disc) to your display. The size of the 'pipeline' if you will. It's not really related to the speed that you're burning the disc. Your burner will buffer the data and burn it as fast as it can to the BR disc. The burning process will not affect quality.

I noticed in my SR11 manual that the max bitrate is 16Mbps. I'm amazed that it has been improved to 25Mpbs in your new Sony! I think the 36Mbps bitrate you've mentioned is the theoretical max for BR. Doesn't necessarily mean that any discs are achieving that bitrate.

Either way, if you're capturing at the highest bitrate your camera is capable of, and outputting the video in its native resolution, I don't think you need to worry about quality.

[McBain]

Originally Posted by mastera

I want to record some Interviews with our new camera. Sony EX3. Our favoured format would be High Quality 1080 25MBitrates per sec (Progressive). Would there be real probs when writing to blueray disk when the writing speed is 36Mbs?

We also have the possiblity with an interlaced format at 50Mbitrates. That is of course also not 36Mbs.

Am I going to run into probs here?

It's possible to author a BD disc with a video data rate of up to 40 Mbps.

Link: http://www.emedialive.com/articles/r...leid=11397#iif