H.265 HEVC for Canon Cinema Cameras?
I'm just picking up news on the new Canon format, H.265 HEVC which will be included with the new XF705 camcorder.
Could this codec be added to other Canon Cameras through a firmware update? Just wondering as it would make recoding 4k on my C300mk2 a whole lot easier. |
Re: H.265 HEVC for Canon Cinema Cameras?
No it can’t, encoding is done with an encoder chip, not via software.
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H.265 is harder to decode and while the compression is more sophisticated than H.264 this would only become significant for lower, destination quality, bitrates. The higher the bitrate the less compression 'finesse' becomes a factor. |
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Thank's all for that feedback.
Yes, the 400Mbps rate was the reason for hoping for a more economical and efficient 4k codec for the C300mk2. |
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Re: H.265 HEVC for Canon Cinema Cameras?
"More efficient" often means "Throwing away more information."
Gradient issues with "blocky" gradients is MUCH WORSE with HEVC, to the point where I truly believe it should not be used in acquisition unless it has a specific profile made for it. Remember, HEVC only just drafted a "High Throughput" profile, and no hardware encoder ASICs support that yet. It's still just "Main 10." Current encoding profiles are for DISTRIBUTION, not ACQUISITION. There's a reason Sony waited until the AVC spec had super high levels to release XAVC. To equate the situation, to use Canon HEVC now is like using the Sanyo Xacti's H264 compression while broadcast acquisition was still 50mbps MPEG2. There's a reason why the bitrate should be high for acquisition. Event video means you should have a dedicated person swapping cards and a LOT of storage. |
Re: H.265 HEVC for Canon Cinema Cameras?
Compression algorithm technology is not static, they have improved and got better over time. Not all compression methods are equal to each other.
I for one do welcome wider usage of more advanced compression tech in cameras. |
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In HEVC, this means low motion often doesn't even get a full set of GOP temporal frames, as it's cheating with temporal information by sometimes not doing full GOP frames if the color in motion is too similar between shades. This is extremely common in highly compressed HEVC. With the move to H264 and HEVC, subtle gradations between stuff like a gradient of the sky become blocky the lower the bitrate. Because they limited the highest level possible for Main 10 and can only go to a certain "very specific" bitrate, You will notice these "banding" artifacts on a clear blue sky a LOT more than H264 if the bitrate isn't high enough. |
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I'm still waiting for a encoding ASIC that supports High Throughput HEVC before taking it seriously. That's likely 2 IBCs away, likely something like XEVC from Sony.
I'm sorry, 160Mbps if it's "Main 10" profile isn't enough. |
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