There's not a single program that's capable of real 2pass encoding with intel qsv. I imagine that Intel has not implemented this functionality. You're right, 2 pass encoding with h264_qsv does not work. I don't mind you using the qsv decoder, but this has nothing to do with the topic. Hi, for purpose of this post i have used ffmpeg build N-81508-g99882d0.įor starters, let's make it really clear. mbtree file, software way) so that it will be able to generate file with bitrate distribution very close to what I observe in x264 case. What I'd like to do it to provide this information about entire movie complexity to QSV encoder (we get this information by running 1st pass on video and it sits in. That's because QSV only takes a number of consecutive frames (defined by look_ahead param) and it is not aware of the complexity of entire input material. As a result a viewer could tell which video is lower quality, even though the two have pretty much the same average bitrate for entire file (435MB total for x264 file and 434MB for qsv). That means that encoder does not provide enough bitrate in most complex scenes and provides more than enough bitrate for simplier scenes (like low-motion). x264, 2pass encoded, 4500kbps average bitrateĪs you surely noticed, the QSV video output has pretty much constant bitrate. They show bitrate distribution in a test video material.ġ. I would like to you take a look at the two pictures below.
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