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4th July 2012, 07:05 | #2 | Link |
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Join Date: Jun 2004
Location: Salzburg, Austria
Posts: 219
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IDR pictures (NAL unit type 5) are always key pictures. I pictures can be key pictures, but do not have to be, since the pictures after it may be predicted from pictures coded before the I picture. Sometimes, recovery point SEI messages (NAL unit type 6 with SEI payload type 6) are present which indicate that I pictures are actually key pictures, but you can't rely on the existence of these SEI messages since they are optional.
Dust Signs
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9th July 2012, 03:25 | #4 | Link |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,989
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You can also use ffdshow + DirectShowSource in AviSynth to get granular seeking.
I believe this method doesn't make a distinction between IDR pictures and I pictures, and simply calls them all I pictures.
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