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flaccidware / webm

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Behavior for lossless combined with segment bsaed Q delta is not well defined in vp9 #1035

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
In vp9: 

  xd->lossless = cm->base_qindex == 0 &&
                 cm->y_dc_delta_q == 0 &&
                 cm->uv_dc_delta_q == 0 &&
                 cm->uv_ac_delta_q == 0;

is defined at the frame level. When a segment has a non-zero delta, the 
segement will not be lossless. 

The behavior of combining lossless and segment based q delta should be 
rationalized in VP10 to enable individual segment level lossless/lossy coding.

Original issue reported on code.google.com by ya...@google.com on 10 Jul 2015 at 11:35

GoogleCodeExporter commented 8 years ago

Original comment by ya...@google.com on 14 Jul 2015 at 4:42

GoogleCodeExporter commented 8 years ago

Original comment by ya...@google.com on 12 Aug 2015 at 10:06