jdpc patrickkfkan can you provide output of following commands during playback of video with 48kHz audio?
I would still like to resolve this issue, if possible.
My apologies for the late reply. Anyway here's the output I got from running the above commands during playback of a video with 48Khz audio:
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				LibreELEC:~ # cat /sys/kernel/debug/clk/clk_summary
                                 enable  prepare  protect                                duty
   clock                          count    count    count        rate   accuracy phase  cycle
---------------------------------------------------------------------------------------------
 iosc                                 0        0        0    16000000  300000000     0  50000
 ext_osc32k                           1        1        0       32768      50000     0  50000
    osc32k                            1        1        0       32768      50000     0  50000
       osc32k-out                     0        0        0       32768      50000     0  50000
 osc24M                              21       21        1    24000000      50000     0  50000
    ir                                1        1        0     8000000      50000     0  50000
    ar100                             1        1        0    24000000      50000     0  50000
       ahb0                           1        1        0    24000000      50000     0  50000
          apb0                        3        3        0    24000000      50000     0  50000
             apb0-twd                 0        0        0    24000000      50000     0  50000
             apb0-i2c                 1        1        0    24000000      50000     0  50000
             apb0-uart                0        0        0    24000000      50000     0  50000
             apb0-timer               0        0        0    24000000      50000     0  50000
             apb0-ir                  1        1        0    24000000      50000     0  50000
             apb0-pio                 1        1        0    24000000      50000     0  50000
    hdmi-ddc                          2        2        0    24000000      50000     0  50000
    avs                               0        0        0    24000000      50000     0  50000
    csi-mclk                          0        0        0    24000000      50000     0  50000
    csi-misc                          0        0        0    24000000      50000     0  50000
    usb-ohci3                         1        1        0    24000000      50000     0  50000
    usb-ohci2                         1        1        0    24000000      50000     0  50000
    usb-ohci1                         1        1        0    24000000      50000     0  50000
    usb-ohci0                         1        1        0    24000000      50000     0  50000
    usb-phy3                          1        1        0    24000000      50000     0  50000
    usb-phy2                          1        1        0    24000000      50000     0  50000
    usb-phy1                          1        1        0    24000000      50000     0  50000
    usb-phy0                          1        1        0    24000000      50000     0  50000
    spi1                              0        0        0    24000000      50000     0  50000
    spi0                              0        0        0    24000000      50000     0  50000
    ce                                0        0        0    24000000      50000     0  50000
    ts                                0        0        0    24000000      50000     0  50000
    mmc2                              0        0        0    24000000      50000     0  50000
       mmc2_output                    0        0        0    24000000      50000   180  50000
       mmc2_sample                    0        0        0    24000000      50000   180  50000
    mmc1                              0        0        0    24000000      50000     0  50000
       mmc1_output                    0        0        0    24000000      50000   180  50000
       mmc1_sample                    0        0        0    24000000      50000   180  50000
    nand                              0        0        0    24000000      50000     0  50000
    ths                               0        0        0    24000000      50000     0  50000
    apb2                              1        1        0    24000000      50000     0  50000
       bus-scr0                       0        0        0    24000000      50000     0  50000
       bus-uart3                      0        0        0    24000000      50000     0  50000
       bus-uart2                      0        0        0    24000000      50000     0  50000
       bus-uart1                      0        0        0    24000000      50000     0  50000
       bus-uart0                      1        1        0    24000000      50000     0  50000
       bus-i2c2                       0        0        0    24000000      50000     0  50000
       bus-i2c1                       0        0        0    24000000      50000     0  50000
       bus-i2c0                       0        0        0    24000000      50000     0  50000
    pll-de                            1        1        0   432000000      50000     0  50000
       de                             2        2        0   432000000      50000     0  50000
          wb-div                      0        0        0   432000000      50000     0  50000
             wb                       0        0        0   432000000      50000     0  50000
          mixer1-div                  0        0        0   432000000      50000     0  50000
             mixer1                   0        0        0   432000000      50000     0  50000
          mixer0-div                  1        1        0   432000000      50000     0  50000
             mixer0                   1        1        0   432000000      50000     0  50000
       tve                            0        0        0   432000000      50000     0  50000
    pll-periph1                       0        0        0   600000000      50000     0  50000
    pll-gpu                           1        1        0   384000000      50000     0  50000
       gpu                            1        1        0   384000000      50000     0  50000
    pll-periph0                       3        3        0   600000000      50000     0  50000
       mmc0                           3        3        0    50000000      50000     0  50000
          mmc0_output                 1        1        0    50000000      50000    90  50000
          mmc0_sample                 1        1        0    50000000      50000   120  50000
       csi-sclk                       0        0        0   600000000      50000     0  50000
       deinterlace                    0        0        0   600000000      50000     0  50000
       ahb1                          13       13        0   200000000      50000     0  50000
          bus-dbg                     0        0        0   200000000      50000     0  50000
          bus-ephy                    1        1        0   200000000      50000     0  50000
          bus-spinlock                0        0        0   200000000      50000     0  50000
          bus-msgbox                  0        0        0   200000000      50000     0  50000
          bus-gpu                     1        1        0   200000000      50000     0  50000
          bus-de                      2        2        0   200000000      50000     0  50000
             bus-wb                   0        0        0   200000000      50000     0  50000
             bus-mixer1               0        0        0   200000000      50000     0  50000
             bus-mixer0               1        1        0   200000000      50000     0  50000
          bus-hdmi                    2        2        0   200000000      50000     0  50000
          bus-tve                     0        0        0   200000000      50000     0  50000
          bus-csi                     0        0        0   200000000      50000     0  50000
          bus-deinterlace             0        0        0   200000000      50000     0  50000
          bus-tcon1                   0        0        0   200000000      50000     0  50000
          bus-tcon0                   1        1        0   200000000      50000     0  50000
          bus-ve                      1        1        0   200000000      50000     0  50000
          bus-ohci0                   2        2        0   200000000      50000     0  50000
          bus-ehci0                   2        2        0   200000000      50000     0  50000
          bus-otg                     1        1        0   200000000      50000     0  50000
          bus-spi1                    0        0        0   200000000      50000     0  50000
          bus-spi0                    0        0        0   200000000      50000     0  50000
          bus-hstimer                 0        0        0   200000000      50000     0  50000
          bus-ts                      0        0        0   200000000      50000     0  50000
          bus-dram                    0        0        0   200000000      50000     0  50000
          bus-nand                    0        0        0   200000000      50000     0  50000
          bus-mmc2                    0        0        0   200000000      50000     0  50000
          bus-mmc1                    0        0        0   200000000      50000     0  50000
          bus-mmc0                    1        1        0   200000000      50000     0  50000
          bus-dma                     1        1        0   200000000      50000     0  50000
          bus-ce                      0        0        0   200000000      50000     0  50000
          ahb2                        7        7        0   200000000      50000     0  50000
             bus-ohci3                2        2        0   200000000      50000     0  50000
             bus-ohci2                2        2        0   200000000      50000     0  50000
             bus-ohci1                2        2        0   200000000      50000     0  50000
             bus-ehci3                2        2        0   200000000      50000     0  50000
             bus-ehci2                2        2        0   200000000      50000     0  50000
             bus-ehci1                2        2        0   200000000      50000     0  50000
             bus-emac                 2        2        0   200000000      50000     0  50000
          apb1                        3        3        0   100000000      50000     0  50000
             bus-i2s2                 1        1        0   100000000      50000     0  50000
             bus-i2s1                 0        0        0   100000000      50000     0  50000
             bus-i2s0                 0        0        0   100000000      50000     0  50000
             bus-ths                  0        0        0   100000000      50000     0  50000
             bus-pio                  1        1        0   100000000      50000     0  50000
             bus-spdif                0        0        0   100000000      50000     0  50000
             bus-codec                1        1        0   100000000      50000     0  50000
       pll-periph0-2x                 1        1        0  1200000000      50000     0  50000
          mbus                        1        1        0   300000000      50000     0  50000
    pll-ddr                           1        1        0  1248000000      50000     0  50000
       dram                           2        2        0  1248000000      50000     0  50000
          dram-ts                     0        0        0  1248000000      50000     0  50000
          dram-deinterlace            0        0        0  1248000000      50000     0  50000
          dram-csi                    0        0        0  1248000000      50000     0  50000
          dram-ve                     1        1        0  1248000000      50000     0  50000
    pll-ve                            1        1        0   402000000      50000     0  50000
       ve                             1        1        0   402000000      50000     0  50000
    pll-video                         3        3        1   297000000      50000     0  50000
       hdmi-phy-clk                   1        1        0   148500000      50000     0  50000
       hdmi                           1        1        0   148500000      50000     0  50000
       tcon                           1        1        1   148500000      50000     0  50000
    pll-audio-base                    1        1        0    22579200      50000     0  50000
       pll-audio-8x                   0        0        0    45158400      50000     0  50000
          i2s1                        0        0        0    45158400      50000     0  50000
          i2s0                        0        0        0    45158400      50000     0  50000
       pll-audio-4x                   1        1        0    22579200      50000     0  50000
          i2s2                        1        1        0    22579200      50000     0  50000
       pll-audio-2x                   0        0        0    11289600      50000     0  50000
       pll-audio                      0        0        0    22579200      50000     0  50000
          ac-dig                      0        0        0    22579200      50000     0  50000
          spdif                       0        0        0    22579200      50000     0  50000
    pll-cpux                          1        1        0  1008000000      50000     0  50000
       cpux                           1        1        0  1008000000      50000     0  50000
          axi                         0        0        0   336000000      50000     0  50000
LibreELEC:~ # cat /sys/kernel/debug/regmap/1c22800.i2s/registers
00: 00060115
04: 00081f57
08: 00000000
0c: 00000044
10: 00000000
14: 020400f5
18: 00000000
1c: 00000080
20: 00000000
24: 00000152
28: 00201101
2c: 00000000
30: 00000011
34: 00001031
38: 00000000
3c: 00000000
40: 00000000
44: 00000010
48: 00000000
4c: 00000000
50: 00000000
54: 00001001
58: 00003210
LibreELEC:~ # 
	
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	Note that I have limited audio resampling to 44.1Khz but, unlike jdpc, I still get broken HDMI audio. If I choose other sampling rates (e.g. 48Khz) or set output configuration to "Optimized", then there is no audio at all. If I choose "ALSA: H3 Audio Codec, Analog" as output device and connect a pair of speakers to the headphone jack on the board, audio plays smoothly (no stuttering).
Hope this helps. Thanks.