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I render in H.265 80Mbps from my Samsung NX1 camera clips and I convert to XAVC-S 100Mbps for YouTube. I upload from YouTube those files without problems.
On my pc WMP is the smoothest player for both H.265 and H.264. Perhaps it is because I downloaded the K-Lite codec pack before upgrading to Windows 10.
First of all... it's great to hear that YouTube accepts XAVC S video and all at 100Mbs! That means I can edit and output in the clip's native format without need for conversion.
As for WMP being the smoothest player for your H264 and H265? Well XAVC S is a H264 codec and WMP plays these native clips from my camera buttery smooth!!
As for H265? My NEW test clip is 10-secs long. It's the same source clip as before, but this time I used PD 14's default 4K UHD 30p (37Mbs) H265 profile instead of customizing it to 100Mbs. Just like the original test...in WMP the sound would end at the 10 second mark like it's supposed to but the video is displaying slower and plays for 15 seconds with obviously the last 5 seconds in total silence.
I took Eugen157's advice ....downloaded and tried Media player classic 64 and at the 3 & 6 second marks of my 10-sec test clip it would pause both video and sound for 2 seconds then play again..... but both video and sound ended at the 10-sec mark like they were supposed to. I tried Daumplayer (never got around to Gom Player) and also tried DivX 10 with their H265 codec installed. BOTH reacted basically the same way as WMP... audio plays for 10-sec, video for 15-secs.
If I play the H265 clip from inside PD 14 (the program that created the file in the first place) BOTH audio and video are in sync and end at 10-sec like they are supposed to.... but there is a ton of dropped frames. So when the camera pans there are clearly jumps without frames in-between that gives it a jutter-like-look. WMP's playback of it looks a bit smoother, but is playing the video for 15-sec/audio for 10-sec..... which means the 30fps video is actually playing at around 20fps.
I went into Sony Vegas 13 and it doesn't support H265 clips in loading OR in rendering. There is a 3rd party hack plug-in that will allow you to work with them but I'm not gonna bother going the unofficial route. I'll wait until official support arrives in a future version or update.
I will say this about H265... it does make pretty small files. The original 100Mbs 4K UHD 10-sec XAVC S clip was 117MB in size and in H265 at 37Mbs ended up at 41MB in size.
So until the support and playback bugs are worked out, I'm gonna leave H265 alone for now and just work in XAVC S for the foreseeable future. The files will just be bigger I guess. I highly doubt the K-Lite codec pack will work for me if all these other programs I tried with their H265 Codecs (including WMP) can't play it back right or smoothly.
Another problem with working with 100Mbs XAVC S files are they are HUGE in size. I recorded a handful of clips of a local train and they total 25GB before I start even editing some of it down. And the final movie of it is still gonna be around 15GB-20GB I'm guessing when I'm done.
My upload speed of my DSL is about 768Kbs and that's gonna take a long time! Even if I use my friend's cable internet with 6Mbs upload speed it's still going to be awhile. I was hoping H265 would help me here but apparently not at this time. I may look into recording my video at 60Mbs to bring down the file sizes and ultimately the upload times to YouTube.
Sony FDR-AX100 4K UHD camcorder
Sony ECM-XYST1M Stereo Microphone
Sony VCT-VPR1 Compact Remote Control Tripod
Vello VB-1000 ActionPan Stabilizing Action Grip
PowerDirector 14
Intel i7-4510u w/8GB RAM Nvidia GTX 850M w/4GB