Maximum AV sync possible with gstreamer 1.8.0 in L4T 24.2 at 23.976 FPS

[dawnpaul]

We are playing media from MP4 file. We used nveglglessink as video sink. We
also tried fpsdisplaysink. In both case the AV sync issue has similar
results. We used alsasink as audio sink and avdec_aac as audio decoder. We
probed the video and audio timestamps at each stage of pipeline and observed
that time difference between first audio and video  timestamp after the
video decoder has delay approximately equal to one frame. The difference is
in time at which the print is coming in gst-debug. The issue is more
frequent in UHD than FHD. So could we confirm that issue is with video
decoder since it is the most intensive task in the pipeline. Could we try to
query the decoder latency dynamically and adjust the pipeline latency in a
non live source. What could be the best method to figure out where is the
issue. Issue appears only in some sessions. Approximately once in 5
sessions.



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