[Bug 69675] audio broken in 24Hz/24p since 3.11 (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69675

--- Comment #51 from Peter Frühberger <fritsch at xbmc.org> ---
Sorry, to warm up this thread. I have also seen that 24p playback is now
"working" again. If one measure the audio vs the video clock. One is approx
10ms behind per 6 seconds, which is compensated by "Duplicating package" or
"resampling" if your player supports this.

On 50hz I am 10ms too far ahead per 6 seconds. This cause for example LiveTV to
run out of packages.

I compared every register with fglrx I could find and there is no real
difference between those two.

Log example with xbmc syncing to video clock (50hz):
15:15:58 T:139930428761856 WARNING: CDVDMessageQueue(audio)::Get - asked for
new data packet, with nothing available
15:16:04 T:139930428761856 WARNING: Previous line repeats 6 times.
15:16:04 T:139930428761856   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:53826205859.132309, should be:53826216146.139511, error:10287.007199
15:16:04 T:139930428761856 WARNING: CDVDMessageQueue(audio)::Get - asked for
new data packet, with nothing available
15:16:10 T:139930428761856 WARNING: Previous line repeats 10 times.
15:16:10 T:139930428761856   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:53832387675.043510, should be:53832398035.209015, error:10360.165502
15:16:12 T:139930428761856 WARNING: CDVDMessageQueue(audio)::Get - asked for
new data packet, with nothing available
15:16:17 T:139930428761856 WARNING: Previous line repeats 7 times.
15:16:17 T:139930428761856   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:53838568755.002014, should be:53838579138.448776, error:10383.446764
15:16:17 T:139930428761856 WARNING: CDVDMessageQueue(audio)::Get - asked for
new data packet, with nothing available
15:16:23 T:139930428761856 WARNING: Previous line repeats 16 times.
15:16:23 T:139930428761856   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:53844735030.241776, should be:53844745675.325325, error:10645.083549
15:16:23 T:139930428761856 WARNING: CDVDMessageQueue(audio)::Get - asked for
new data packet, with nothing available

Log with 24p:
12:00:37 T:140730861328128   DEBUG: CDVDPlayerAudio::Discontinuity2 -
was:246782652.089114, should be:246769963.622166, error:-12688.466948
12:00:45 T:140730861328128   DEBUG: CDVDPlayerAudio::Discontinuity2 -
was:254909959.765166, should be:254897679.533340, error:-12280.231826
12:00:53 T:140730861328128   DEBUG: CDVDPlayerAudio::Discontinuity2 -
was:263037680.565340, should be:263025287.637961,

I tried to play with register 0x05b4 and 0x05b8 but could not find a ratio so
that the drops would stop. Not sure if this is related to the original problem
though.

Btw. you won't notice this problem, if you play local content and for example
resample audio.

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