[RESOLVED] S905X Krypton: H264 23.976p frame skips

jd17 · January 27, 2017 at 5:06 PM

I have frame skips in all 23.976p videos.

Device type:
S905X
Build:
7.90.beta2
Device:
Mini M8S II 2GB/16GB

How to reproduce:
Frame rate switching is on (start/stop).
Menu is on 1080p/60Hz.
Audio is set to HDMI passthrough.
Almost everything else is on default.

-> Start any H264 23.976p video.

Sample:
Happens with every clean H264 encode.
All the encodes tested work fine with 7.0.3.012c or on a RPi2 with any Krypton build.
Specs from video in log:

Quote

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 21 min 22 s
Bit rate : 5 120 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.103
Stream size : 783 MiB (93%)
Language : English
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : A_AC3
Duration : 21 min 23 s
Bit rate mode : Constant
Bit rate : 384 kb/s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 spf)
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 58.7 MiB (7%)
Language : English
Default : Yes
Forced : No

Display More

Support logs:
Attached.
The video only ran for a few minutes and more than 20 frame skips occurred.

jd17 · January 31, 2017 at 12:04 PM

Am I really alone with those frame skips? :s

kapone · January 31, 2017 at 12:39 PM

Nope, I have the same. But...as far as I know (I could be wrong), with the 8.0 beta builds, fractional refresh rates are not working...yet. Eventually, they should.

jd17 · February 1, 2017 at 9:47 AM

Well, the last info I got from kszaq is that he does not have any frame skips and the patch for 23.976fps is already implemented since a while...

**kszaq** · February 1, 2017 at 10:03 AM

Quote from jd17

Well, the last info I got from kszaq is that he does not have any frame skips and the patch for 23.976fps is already implemented since a while...

I will try to contact the developer behind the latest improvements to Amlogic hardware decoding, I have some ideas why this might not work.

Hans Gruber · February 1, 2017 at 10:25 AM

I'm also getting frame skips on 60fps video with krypton builds too, Jarvis is fine. I can't post any logs (if they'd be helpful?) as I've gone back to 7.0.3.012g, sorry.

jd17 · February 1, 2017 at 1:55 PM

Thanks kszaq, that sounds good.

Hans Gruber:
Maybe you misread the issue... This is about 23.976 frames, not 60 frames video.
I only had the menu set to 60fps.
Changing that to 50fps or 30fps does not have any effect on the 23.976fps video for me, as long as frame rate switching is active of course.

Hans Gruber · February 1, 2017 at 3:45 PM

Yeah I was just adding that I get frame skips on 60 and 24fps video. Thought it might be connected.

lama0900 · February 2, 2017 at 5:07 PM

Anything new to that?

jd17 · February 2, 2017 at 6:55 PM

Not yet.
I just tested the final (Beta 5) - same issues.

inside · February 6, 2017 at 9:28 AM

with krypton, pulldown correction (pc:1) in codec info (keyboard o) is active even if frame rate switching is on. on jarvis codec info shows (pc:0). if frame rate switching is on. i think this is because kodi drops the "old" am-codec support. since v17 they only use Android Media Codec.

this is from the kodi forum by a AMLogic Dev.

"Something maybe I can add, as an internal developer inside Amlogic. XBMC/Kodi runs on Amlogic's chipset in two modes: either through amcodec acceleration, i.e. am-264/265, etc, or through the Android standard MediaCodec API (amc-XXX). If amcodec acceleration is being used, then the video playback is fully controlled in its own pipeline and Android/system does not have any effect over the frame rate conversion. The newer Amlogic's Android release has HDMI refresh rate matching, so 23.97fps source will make HDMI output goes to 23.97hz or 59.97hz accordingly. However, if MediaCodec is used (when the acceleration is off), then the rendering of video frames are all controlled by XBMC/Kodi's logic. When and how the frame rate conversion is made is all controlled by application and normally there is no way for the application to do any HDMI output mode matching without other special hacks on a rooted system."

i don't know how libreelec will handle this stuff, but with v17 (any version) i never got (pc:0)

**kszaq** · February 6, 2017 at 9:53 AM

LibreELEC doesn't have Android's MediaCodec, it uses amcodec and it's the only way available in "pure Linux".

inside · February 6, 2017 at 10:12 AM

thx kszaq, good to know!...but why i get pc:1 in the player debug view (CTRL-SHIFT-o) in version 7.95(v17 RC4)... can this be a bug in the view?

jd17 · February 12, 2017 at 2:40 AM

Resolved in Beta6.

Pablo_k · July 12, 2017 at 6:51 PM

Hi guys,

I think I am seeing this issue over LibreELEC (official) - Version: 8.0.2.

I am sorry but I am not familiar with project and I do not how to track this issue to the actual fix, nor how to follow the fix to the official releases to verify if this is actually fixed on the official version that I am using or not, but I think it looks like the same thing.

When I start system I have to change the menu setting from 50fps or 60fps to 24fps (if it is already set at 24fps I need to change to 50 or 60, and then back to 24) in order to get rid of the frame drops described in this thread.

Please find attached syslog, I sorry If it is too long, but I did not want to cut anything that could be helpful.

Thanks!

**wrxtasy** · July 13, 2017 at 7:05 AM

Hint - set:

Kodi Settings > Player > Video > Adjust Display Refresh Rate > Start/Stop

Do NOT enable Sync Playback to Display

Pablo_k · July 23, 2017 at 6:41 PM

Hi wrxtasy,

Quote from wrxtasy

Hint - set:

Kodi Settings > Player > Video > Adjust Display Refresh Rate > Start/Stop

Do NOT enable Sync Playback to Display

Thanks for your reply!

I already had 'Kodi Settings > Player > Video > Adjust Display Refresh Rate' in Start/Stop mode, and 'Sync Playback to Display' disabled.

So unfortunately that did not solved the issue.

Shall I posted as a bug in Bug Reports as a new issue since this is already marked as RESOLVED?

Thanks again for your time.