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3rd January 2016, 11:03 | #1 | Link |
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x264 with --bluray-compat Ref Frames
Hi
i made a few Encodes with x264 and --bluray-compat Setting. I know it overrides the X264 Settings to follow Bluray Specs. I usally set Ref Frames to --ref 4 for Level 4.1 Compliant 1920x1080 encodes but x264 outputs always 3 with Bluray Compatible ? Simple x264 cmd : --level 4.1 --bluray-compat --preset veryslow --open-gop --ref 4 --slices 4 --vbv-bufsize 30000 --vbv-maxrate 40000 I hope somebody can clafiry this x264 behaviour Greetings |
3rd January 2016, 12:49 | #2 | Link |
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If i remember properly, there is something about the ref frame reduced by 1 (or something similar) when pyramid is enabled, which is the default setting. BTW, if bluray-compat doesn't change the pyramid setting (i don't remember if it does), it should pe put on "strict".
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15th January 2016, 19:12 | #6 | Link |
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The whole definition of "number of reference frames" is a little too ambiguous . I believe there are still actually 4 reference frames max in the decoded picture buffer with BD, but one is a "different" kind from the x264 perspective.
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11th April 2024, 09:23 | #9 | Link | |
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Quote:
IbBbPbBbP.... With this option active (B-pyramid "Strict"), it turned out to me that B-frames cannot refer to other B-frames, but only to P-Frames (and I). And of course, much less P-Frames cannot refer to B-Frames, but I and P only. But the "strict" option alone does not limit the number of frames to refer to 1. The hierarchy is rigorous: I --> P --> B --> b with "normal": I --> P/B <--> B --> b Last edited by blob2500; 11th April 2024 at 09:40. |
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