id summary reporter owner description type status priority milestone component version severity resolution keywords cc mlocked 13532 Slow drift in a/v sync on non-nVidia system jpilk Mark Kendall "In late 2019-render and now in master I get a slow drift, of order 2 seconds per hour, in a/v sync in a framed window display on a monitor. The system uses ffmpeg decoding and deinterlace. I don't see the drift on a system using nVidia graphics. Mismatched use of frame display rates seems a possible root cause, but #13531 did not fix it. {{{ At frontend startup on the NV box 2019-12-05 14:16:59.461932 I DisplayX11: Raw/unsorted XRANDR modes: 2019-12-05 14:16:59.461950 I 3600x1080 50.00 2019-12-05 14:16:59.461958 I 1680x1050 51.00 2019-12-05 14:16:59.461964 I 1440x900 52.00 2019-12-05 14:16:59.464301 I DisplayX11: Updated/sorted XRANDR modes (interlaced modes may be removed): 2019-12-05 14:16:59.464319 I 1680x1050 59.95 2019-12-05 14:16:59.464328 I 1440x900 59.89 2019-12-05 14:16:59.464335 I 1280x1024 75.02 60.02 $ xrandr Screen 0: minimum 8 x 8, current 3600 x 1080, maximum 16384 x 16384 VGA-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 271mm 1680x1050 59.95*+ 1440x900 59.89 1280x1024 75.02 60.02 }}} On the affected box only the raw/unsorted block is shown and the NV-CONTROL X extension is reported to be not available. In both cases the 'raw' values have been rounded. This seems strange. Skipping backwards and forwards makes the effect worse. The -v playback log reports only small errors, and drops frames to keep them below around 40 ms. " Bug Report - General closed minor 31.0 MythTV - General Master Head medium Fixed a/v sync 0