<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV><DIV>On Jan 8, 2007, at 2:30 PM, Brad Fuller wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">XvMC, AFAIK, is a mechanism to offload IDCT and motion compensation<SPAN class="Apple-converted-space"> </SPAN></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">chores to the GPU. Right?</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Thus, by definition mpeg2 streams from OTA HD are going to be different<SPAN class="Apple-converted-space"> </SPAN></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">than mpeg2 streams from your PVR card that does the mpeg2 encoding.<SPAN class="Apple-converted-space"> </SPAN>So,<SPAN class="Apple-converted-space"> </SPAN></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">the decoding of a stream from OTA HD and from you PVR card are going to<SPAN class="Apple-converted-space"> </SPAN></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">be different.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">What do you mean "XvMC doesn't work"? What leads you to this conclusion</DIV></BLOCKQUOTE></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Piles and piles of prebuffering errors, skipping playback - the same thing that I was seeing with HD before the latest NVidia drivers (and turning off sync to vblank). </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I was guessing it was file format. It's kind of annoying, since I can play both HD and SD but have to flip the configuration between the two. Here's some output:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>2007-01-07 20:11:36.371 NVP: prebuffering pause</DIV><DIV>2007-01-07 20:11:36.394 NVP: Waiting for prebuffer.. 0 uADDDuLD</DIV><DIV>2007-01-07 20:11:36.793 NVP: Video is 3.20878 frames behind audio (too slow), skipping A/V wait.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>and</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>2007-01-07 20:11:36.797 WriteAudio: buffer underrun</DIV><DIV>2007-01-07 20:11:37.143 WriteAudio: buffer underrun</DIV><DIV>2007-01-07 20:11:37.412 NVP: Video is 3.22094 frames ahead of audio,</DIV><DIV> doubling video frame interval to slow down.</DIV><DIV>2007-01-07 20:11:37.560 NVP: Video is 3.50962 frames ahead of audio,</DIV><DIV> doubling video frame interval to slow down.</DIV><DIV>2007-01-07 20:11:37.728 NVP: prebuffering pause</DIV><DIV>2007-01-07 20:11:37.750 NVP: Waiting for prebuffer.. 0 DDAuDLUu</DIV><DIV>2007-01-07 20:11:38.113 NVP: prebuffering pause</DIV><DIV>2007-01-07 20:11:38.133 NVP: Waiting for prebuffer.. 0 AuDLDADU</DIV><DIV>2007-01-07 20:11:38.411 NVP: Video is 3.09489 frames behind audio (too slow), skipping A/V wait.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Very similar to what I was seeing with HD before tweaking my NVidia setup. </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Drew</DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>--</DIV><DIV>Drew Bernat</DIV><DIV><A href="mailto:abernat@zathras.net">abernat@zathras.net</A></DIV><BR class="Apple-interchange-newline"></SPAN></SPAN></SPAN> </DIV><BR></BODY></HTML>