http://www.personal-view.com/talks/discussions/tagged/maximum/feed.rss Wed, 01 May 24 20:38:42 +0000 Tagged with maximum - Personal View Talks en-CA http://www.personal-view.com/talks/discussion/6472/maximum-lens-weight-gh3 Fri, 22 Mar 2013 08:44:56 +0000 prince 6472@/talks/discussions What is the maximum lens weight for the GH3? I want to use my old Tokina 28-70 lens with a nikon f adapter as my walk around lens. It weights around 600g (~1,3p). Do you think it is okay for the gh3 body or it is gonna distort/rip the mount? It just feels that the m43 mount is small and weak compared to other mounts.

]]> http://www.personal-view.com/talks/discussion/1170/avchd-maximum-image-quality-series-2 Thu, 13 Oct 2011 07:22:53 +0000 Vitaliy_Kiselev 1170@/talks/discussions http://www.personal-view.com/talks/discussion/699/avchd-maximum-image-quality-settings-and-testing]]> http://www.personal-view.com/talks/discussion/989/gh2-maximum-variation-experiment Mon, 19 Sep 2011 19:10:46 +0000 cbrandin 989@/talks/discussions
So far most patches have attempted (deliberately, or not) to achieve a fairly high constant bitrate. In other words - bitrate has been king. This patch takes an entirely different approach. In this patch measured quality is king, and bitrate use and buffering is allowed to vary.

The basic architecture of a VBR H.246 codec is to set up boundaries for min/max bitrate and QP settings. As a frame is encoded a range of QP (quality) values are attempted for each macroblock. The searching stops under one of two circumstances - either the macroblock reaches a quality level within the number of bits allocated for it, or the quality is degraded until the allocated bits are not exceeded. The problem with this is that the codec isn't perfect, so it may degrade the image somewhat before the frame is finished as all this is estimated, and few higher QP values are attempted.

This patch allows many more QP settings to be attempted for each I frame. Thus if a desired quality level is reached with a higher QP value it will be used and bandwidth is made available for later macroblocks that may need it more. The best way I can put it is that this patch does more to use actual measured quality rather than theoretical quality.

I've done some testing - but I would like additional input. Unfortunately, spanning is still an issue. This is pretty experimental at this point, so don't rely on this patch yet.

Chris]]>