Tagged with idr - Personal View Talks http://personal-view.com/talks/discussions/tagged/idr/feed.rss Sat, 09 Nov 24 02:47:40 +0000 Tagged with idr - Personal View Talks en-CA Closed GOPs vs. Open GOPs, when are IDR frames written? http://personal-view.com/talks/discussion/3118/closed-gops-vs.-open-gops-when-are-idr-frames-written Sat, 05 May 2012 19:43:35 +0000 karl 3118@/talks/discussions While analyzing some issues with cutting the .MTS files from a GH2 in the compressed domain (without re-encoding), I was wondering if anybody can tell me how large the Closed GOPs are in those files, or put otherwise: When / how frequently are IDR frames written into the stream?

I understand that most patch settings tamper with the number and type of frames in each (open) GOP, but I have not yet found any mentioning on how many frames are written into one closed GOP.

Or does anybody know what the maximum amount of reference frames is that the GH2 output uses? (H.264 would allow up to 16, but since many decoders are not willing to store that many decoded frames for later use as a reference, the lower H.264 profiles are limited to much less.)

]]>