A new firmware has been released: No DNxHD anywhere.

Dear Friends,

We tried to get Avid DNxHD ready for this release. The Number One Priority for our next release is Avid DNxHD.

While we can encode Avid DNxHD and we can decode Avid DNxHD, we are still fine-tuning "Rate Control".

Avid DNxHD is a codec which has a specific maximum record size, (frame size) for specific conditions, including resolution and frame rate.

And this maximum record size must never be exceeded.

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But, one needs to have the codec encoding process perform a preliminary estimation of how much image quality to use to encode each frame of video. Then encode the frame fully, then see if the maximum frame size has been exceeded. If it has, then the codec encoding process has to restart.

Of course, a good codec wants to maximize the image quality on each frame, so one needs to be close to the maximum frame size in most every case, (unless the image is so easy to encode and the maximum image quality is obtained without using the maximum frame size.)

The challenge with Rate Control for DNxHD is that this has to work 100 percent of the time, no matter how complex the frame image, or how different one frame is from the previous one.

We are still perfecting our Rate Control.

Respectfully,