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<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">VLC with VDPAU is falling back to s/w decoding for vc1 simple and Main profile clips.
<o:p></o:p></p>
<p class="MsoNormal">i.e. with cmd ./vlc --avcodec-hw=vdpau /home/bondamanoj/VideoClips/Amazing_Caves_720.wmv<o:p></o:p></p>
<p class="MsoNormal">and error is reported as, "Failed setup for format vdpau: hwaccel initialisation returned error"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This failure is due to level check in function ff_vdpau_common_init() in ffmpeg/libavcodec/vdpau.c
<o:p></o:p></p>
<p class="MsoNormal">The level is not populated in ffmpeg for vc1 simple and main profile clips.<o:p></o:p></p>
<p class="MsoNormal">As the level will be communicated via transport layer, as per section D.4 Syntax (Informative) from vc1 spec<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">“The Simple and Main profiles are communicated to the decoder by the syntax element PROFILE as part of the<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">initialization metadata as described in Annex J.1.1. The Advanced profile is signaled to the decoder in the bitstream,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">by the syntax element PROFILE, which is included in the sequence header as described in Section 6.1.1.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">The levels for Simple and Main profile are to be communicated to the decoder by the Transport Layer. The levels for<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">Advanced profile are indicated in the syntax element LEVEL, which is included in the sequence header, as described in Section 6.1.2.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">The following codes are used to signal the levels in this profile:”<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal">I see, ffmpeg sets 'AV_HWACCEL_FLAG_IGNORE_LEVEL' flag. Hence, the level is initialized to zero<o:p></o:p></p>
<p class="MsoNormal">while using ffmpeg. This lets standalone ffmpeg application and Mplayer to decode the clip with VDPAU hw acceleration.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I observed that VLC is not setting AV_HWACCEL_FLAG_IGNORE_LEVEL flag, level gets initialized to -99,<o:p></o:p></p>
<p class="MsoNormal">and eventually fails the check in ff_vdpau_common_init() resulting in the failure reported above.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Attaching the patch for setting AV_HWACCEL_FLAG_IGNORE_LEVEL flag in VLC as well.<o:p></o:p></p>
<p class="MsoNormal">I am curious what others think about this issue.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">ManojGuptaBonda.<o:p></o:p></p>
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