A/V out-of-sync unless deinterlace is off

ciclista71 · June 25, 2021 at 3:29 PM

Hi,

I have very recently built and configured an rpi4 2G RAM with the LibreELEC running 18.9 and its TV Hat, using TVH to record Live TV in Italy.

I have confgured auto-resolution at start/stop, and never played with whitelists.

I have noticed some slight (but still annoying) a/v oos which I could solve in two ways:

1) Sync audio to video --> this works but I cannot FFW to more than 1.5x and this is annoying as it is not easy to skip commercials quickly

2) turn deinterlacing to OFF --> this works well and I don't need to sync audio to video anymore, but scrolling titles are unwatchable because they are not smooth. I tried all the possible options and none of them works.

Video is interlaced, TVH profile is the default so I am using MPEG-TS, video frame-rate is 25FPS and I see 50Hz playback on my telly.

Code

eneral
ID                                       : 5 (0x5)
Complete name                            : Y:\RegistrazioniTV\Rai 3 HD-2021-06-16-21_10\Rai 3 HD-2021-06-16-21_10-Rai 3 HD2021-06-1621-10.ts
Format                                   : MPEG-TS
File size                                : 8.28 GiB
Duration                                 : 3 h 19 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 5 924 kb/s

Video
ID                                       : 533 (0x215)
Menu ID                                  : 8593 (0x2191)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Format settings, GOP                     : M=4, N=16
Codec ID                                 : 27
Duration                                 : 3 h 19 min
Bit rate                                 : 5 114 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 25.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : MBAFF
Scan type, store method                  : Interleaved fields
Scan order                               : Top Field First
Bits/(Pixel*Frame)                       : 0.099
Stream size                              : 7.14 GiB (86%)

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Is there any other possible workaround, maybe playing with different settings? Would matroska profile in THV help? I read something about it but I wouldn't want to further stress the rpi in an on-the-fly conversion.

Thanks a lot for your suggestions! So far I have seen posts of people complaining, and the only solution was to set deinterlace to OFF....