Brother Younger

Joined on Jun 2, 2016

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Total: 3, showing: 1 – 3
On article Panasonic Lumix DC-GH5 Review (1197 comments in total)
In reply to:

Brother Younger: This is important enough for anybody interested in or using GH5.

Panasonic is planning to add 400mbps ALL-I video encoding for GH5 this summer, but that does not raise the bar of image quality for the videos recorded by the camera as ALL-I has much higher requirements for the bitrate (compared to IPB) for an equivalent image quality. I've created a petition for Panasonic to add support for high bitrate IPB modes into GH5.

If you like that idea, please sign the petition: https://www.change.org/p/panasonic-introduce-4k-4-2-2-ipb-400mbps-and-fhd-4-2-2-ipb-200mbps-modes-for-panasonic-gh5?recruiter=44141647&utm_source=share_petition&utm_medium=copylink

Besides easier editing ALL-I codec brings one more feature - it is not affected by the speed of movements in the frame. It's an intra-frame codec so every frame is a self sufficient image (just like JPEG). For IPB the motion-tracking part of the compression is the largest contributor into the final compression ratio, but camera's ability of tracking the movements is limited by the amount and speed of RAM and computing power available (modulo the thermal envelope), as the compressing engine needs to find new location for moving objects in each next frame and bitmap comparison is a very CPU and memory access intensive operation.

Thus in case of shooting rapidly moving subjects (e.g. sports), ALL-I may give a better image quality (compared to IPB), but for less dynamic subjects IPB will bring a noticeably higher image quality for the same bitrate.

Link | Posted on Apr 29, 2017 at 07:12 UTC
On article Panasonic Lumix DC-GH5 Review (1197 comments in total)

This is important enough for anybody interested in or using GH5.

Panasonic is planning to add 400mbps ALL-I video encoding for GH5 this summer, but that does not raise the bar of image quality for the videos recorded by the camera as ALL-I has much higher requirements for the bitrate (compared to IPB) for an equivalent image quality. I've created a petition for Panasonic to add support for high bitrate IPB modes into GH5.

If you like that idea, please sign the petition: https://www.change.org/p/panasonic-introduce-4k-4-2-2-ipb-400mbps-and-fhd-4-2-2-ipb-200mbps-modes-for-panasonic-gh5?recruiter=44141647&utm_source=share_petition&utm_medium=copylink

Link | Posted on Apr 24, 2017 at 11:41 UTC as 37th comment | 3 replies
On article Panasonic Lumix DC-GH5 Review (1197 comments in total)

A bit of GH5 footage (including the unedited out-of-camera footage - linked from the video's description) for those who wants to see how the IQ is changing when VFR is used: https://youtu.be/vSCJdLlJ3Bw

To me it is apparent that as soon as VFR exceeds the maximum non-VFR frame rate, the IQ drops significantly.

Link | Posted on Apr 22, 2017 at 15:40 UTC as 38th comment
Total: 3, showing: 1 – 3