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HEVC larger than H.264

Jun 29, 2016 at 7:04 AM
I just built a new HTPC and have been trying out HEVC. I've done a few conversions and found many of them to be smaller than half the size of a comparable h.264 conversion. All I use MCEBuddy for is converting recordings from Windows Media Center in Windows 7 64 bit.

Then last night I converted a PBS show. The original MPEG-2 1080i recording was around 4GB after some superfluous material was removed (according to the log file). The HEVC was around 3GB. As this particular show doesn't need to be saved at the highest quality I ran an h.264 720p compression on it which came out to 1.05GB. So I thought doing an HEVC 720p encode would come out to less than 500MB, but to my surprise it came out to 1.39GB, larger than the h.264! I can't figure out why this would be happening. The quality slider is set to 0, but the bitrate on my HEVC 720p is coming out to 3478 Kbps while the h.264 is 2487 Kbps.
Jun 29, 2016 at 7:12 AM
Here are links to the log files:

h.264 720p Log File

HEVC 720p Log File

Thanks
Jun 29, 2016 at 6:10 PM
depends upon the base bitrate/quality setting in the profile. The slider will make incremental adjustments to it.

Jun 29, 2016 at 6:20 PM
I don't see a bitrate setting, only the slider. If you are talking about the default HEVC MP4 profile the description says it will create a smaller file of comparable quality, which has worked on other shows I've compressed using the same settings.
Jun 29, 2016 at 11:53 PM
I had to reduce quality to -20% to achieve a bitrate near 1kbps, which is what I was seeing on other compressions it was doing. Hopefully quality will be similar to an h.264 at around 2.5kbps. I'll have to try a few recordings and see.