Choppy 1080p HEVC

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1

Hello,
I just discovered some problems with playing back HEVC encoded anime Ghibli Collection movies.
They are playing choppy right from the start, and when I hit OK button (to display player controls and progressbar) it does frequently like if its seeking.

I have vero4k with latest OSMC.

But, when I disable hw acceleration, it plays back OK…of course until CPU gets to 100%.
Here is mediainfo:

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main@L5@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 1 h 12 min
Bit rate : 1 234 kb/s
Width : 1 920 pixels
Height : 1 036 pixels
Display aspect ratio : 1.85:1
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Bits/(Pixel*Frame) : 0.026
Stream size : 637 MiB (92%)
Default : Yes
Forced : No

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : A_AAC-2
Duration : 1 h 12 min
Bit rate : 101 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Delay relative to video : 20 ms
Stream size : 52.2 MiB (8%)
Language : Japanese
Default : Yes
Forced : No

I have more files like this and all of them behave the same. Any other HEVC encoded movie plays back OK. Have anyone encounter similar behaviour? Thanks.

2

Hard to advise here without a log or sample.
Have you tried playing the file from local storage?

Sam

3

Sure, here are the logs:
http://paste.osmc.tv/atixequvoh

On 17:44, I started playing:

  1. played with hw acc on from local storage
  2. played with hw acc on from external HDD via USB, like I always do
  3. played with hw acc off from external HDD via USB, like I always do

Playing on PC by MPC-HC is all OK with HW acceleration on.

4

Enable ‘Adjust Refresh Rate’

5

Just tried it, set it to “always” also tried restart vero4k…no success
The video is encoded in L5.0…is that ok? I dont know what levels can amlogic handle.

6

That looks in spec – so should be supported
Can you make a small sample of the file so we can check it here?

Sam

7

I have made a sample:
https://1drv.ms/u/s!AvxQjdxOFjNVin2Ij18l-cTVm8Xr

8

In the meantime, I think I found the culprit…with most probablility, its the video file itself.
I have reencoded it into HEVC again with ffmpeg (HEVC to HEVC), audio and subtitle streams just copied.
And now it plays flawlessly.

I think its have been encoded with some weird settings, which amlogic HW decoder does not like.
Never experienced any other movie(s) with such behavior, and I do have pretty big HEVC collection.

Just from curiosity, there was nothing even in the logs which can point us in some direction?

9

I did not get a chance to study the sample just yet

Sam

10

Thats okay :slight_smile:
At least, I would know what can cause it, just from curiosity.
Feel free to take your time. By now, I have it resolved by reencoding. Its anime, so quality impact is not noticeable.