Since I haven’t seen this mentioned anywhere else really (it’s very well hidden in NVidia’s documentation), I thought I should mention it here in the interest of helping people fixing odd playback problems (read: it’s part of my evil plan to make people stop using hardware acceleration).<\/p>\n
Anyway, getting to the point, certain NVidia GPU’s have a PureVideo decoding chip that does not support decoding H264 videos of certain widths. More specifically, the broken width ranges are 769-784, 849-864, 929-944, 1009-1024, 1793-1808, 1873-1888, 1953-1968 and 2033-2048 pixels. Any H264 video with a width in these ranges will fail to decode using CUDA or VDPAU or DXVA or whatever you please. This does not, of course, affect software decoding in any way whatsoever.<\/p>\n
Particularly interesting and commonly used resolutions that are affected by this are, for example, 852×480, 864×480 and 1024×576.<\/p>\n
A list of the affected GPU’s follow.<\/p>\n
Fuck GPU decoding; GPU decoding sucks; GPU decoding is dying; GPU decoding is dead to me; GPU decoding hit WTC.<\/p>\n
This actually is<\/strong> mentioned in NVidia’s official documentation, but it’s pretty well hidden. First, go to Appendix A<\/a> in the VDPAU documentation and look at the GPU’s with an “1” in the “VDPAU features” column. Then go to Appendix H<\/a> in the same documentation, and in the “Implementation Limits” section, go to the “VdpDecoder” subsection, and at the very bottom you’ll find a small note saying:<\/p>\n VDPAU Features Note 1 Thanks Lord for pointing this out to me.<\/p>\n","protected":false},"excerpt":{"rendered":" Since I haven’t seen this mentioned anywhere else really (it’s very well hidden in NVidia’s documentation), I thought I should mention it here in the interest of helping people fixing odd playback problems (read: it’s part of my evil plan to make people stop using hardware acceleration). Anyway, getting to the point, certain NVidia GPU’s […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-170","post","type-post","status-publish","format-standard","hentry","category-encoding"],"_links":{"self":[{"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/posts\/170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=170"}],"version-history":[{"count":4,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/posts\/170\/revisions"}],"predecessor-version":[{"id":173,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=\/wp\/v2\/posts\/170\/revisions\/173"}],"wp:attachment":[{"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mod16.org\/hurfdurf\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nGPUs with this note may not support H.264 streams with the following widths: 49, 54, 59, 64, 113, 118, 123, 128 macroblocks (769-784, 849-864, 929-944, 1009-1024, 1793-1808, 1873-1888, 1953-1968, 2033-2048 pixels).<\/p><\/blockquote>\n