[FFmpeg-user] Audio/Video desync

[Rodriguez, Josue]

Sorry, here they are in text form:

Command:

-hide_banner
-use_wallclock_as_timestamps 1
-r 20
-f x11grab
-video_size 1280x720
-draw_mouse 0
-i :1
-f pulse
-i default
-c:a aac
-c:v libx265
-preset ultrafast
-bufsize 3968k
-pix_fmt yuv420p
-f rtp_mpegts
-async 44100
-fec prompeg=l=20:d=5
rtp://host.docker.internal:3200

CLI Logs:
frame=   21 fps=0.0 q=35.0 size=      57kB time=00:00:01.92 bitrate= 243.6kbits/s speed=3.47x
 frame=   51 fps= 48 q=32.6 size=     104kB time=00:00:01.92 bitrate= 442.8kbits/s speed=1.81x
 frame=   55 fps= 35 q=32.8 size=     108kB time=00:00:01.95 bitrate= 452.3kbits/s speed=1.25x
 frame=   55 fps= 27 q=32.8 size=     108kB time=00:00:01.95 bitrate= 452.3kbits/s speed=0.942x
 frame=   55 fps= 21 q=32.8 size=     108kB time=00:00:01.95 bitrate= 452.3kbits/s speed=0.757x
 [aac @ 0x7fa68bd0c080] Queue input is backward in time

[rtp_mpegts @ 0x7fa68bd7a0c0] Non-monotonous DTS in output stream 0:1; previous: 178560, current: 752; changing to 178561. This may result in incorrect timestamps in the output file.

[rtp_mpegts @ 0x7fa68bd7a0c0] Non-monotonous DTS in output stream 0:1; previous: 178561, current: 2672; changing to 178562. This may result in incorrect timestamps in the output file.

[rtp_mpegts @ 0x7fa68bd7a0c0]
Non-monotonous DTS in output stream 0:1; previous: 178562, current: 4592; changing to 178563. This may result in incorrect timestamps in the output file.

[rtp_mpegts @ 0x7fa68bd7a0c0]
Non-monotonous DTS in output stream 0:1; previous: 178563, current: 6512; changing to 178564. This may result in incorrect timestamps in the output file.

[rtp_mpegts @ 0x7fa68bd7a0c0] Non-monotonous DTS in output stream 0:1; previous: 178564, current: 8432; changing to 178565. This may result in incorrect timestamps in the output file.