S905x Video - MPEG2 720P/50 AC3 2 ch Stutters

1st Official Post

    I have MPEG2 720P video recordings via a Mythtv backend which "stutter" when played on Libreelec build 7.0.2.009 from 7.0.2.009

    About once per second there will be a brief pause in the video.
    This occurs whether the video is played via the mythtv addon or directly from the server via an NFS share

    Device details - AMLogic S905X, Mini M8S II, 2GB/8GB boot from SD Card (16GB Sandisk)

    Hardware acceleration is turned on for MPEG >= 720P

    Logfile posted at Ubuntu Pastebin
    Video stream commences at about log time 16:02:07

    Same problem occurs for all videos 720p from this channel


    filename1024_20161203090100.ts (current affairs)- H264 MPEG-4 AVC (part 10) (h264), 1280x736, framerate 50hz
    - A52 Audio (aka AC3) (a52) Stereo Rate 48000 Hz Bitrate 256kb/s

    I have a video sample but was unable to successfully attach it ....

    Edited once, last by redger (December 7, 2016 at 6:41 AM).

    • Official Post

    MOD NOTICE: moved to amlogic community forum because the user is using a community build not an official build

    The problem can be reproduced on the alpha version LibreELEC-S905.arm-8.0-devel-20161204210449-r24821-g9f57b18.img.gz

    Log Ubuntu Pastebin starting from log time 08:03:08.740

    In this case the same content as above is played (a) on the alpha release (b) from a file on an NFS share rather than via the pvr-mythtv addon - note that it's still the same file being played
    Filename = 1024_20161203090100.ts

    Codec info
    - MPEG-2 (mpgv), 1280x736, display 1280x720, framerate 50hz
    - A52 Audio (aka AC3) (a52) Stereo Rate 48000 Hz Bitrate 256kb/s

    Display capabilities (confirm 50Hz is available)


    This looks like -

    • A highly repeatable problem. It always occurs on these 720P/50 files
    • It looks as though it could be related to a timing issue eg. 50Hz content played at 60Hz, which would create a "judder" every 5/6 of a sec (say), tho it appears the output has been set to 1080p/50 (see above) .. perhaps related to upscaling ?
    • The issue occurs in both the "stable" and "alpha" releases ie. Kodi v16 and v17


    This does not look like a de-interlacing issue based on the available information (of course I could be wrong :) ) particularly since this is Progressive content ie. does not need deinterlacing

    Edited once, last by redger (December 7, 2016 at 9:23 PM).