[FFmpeg-user] Audio slowly getting out of sync

[Carl Eugen Hoyos]

2016-11-21 17:02 GMT+01:00 Gabor Alsecz <alseczg at gmail.com>:

> I have an issue when encoding HLS stream from an RTSP mjpeg
> video stream + USB audio via dshow.

Why is FFmpeg not reading the video stream itself?
Why is the pipe (that makes keeping A/V sync probably impossible)
necessary?

> At the beginning audio & video are in sync but slowly but steadily
> the sound drifting out of sync. Video seems faster, approximately
> each 10 minutes the audio late +1 second.
>
> I am using the following command:
> ffmpeg -y -loglevel info -f dshow -i audio="Microphone (Trust Gaming
> Microphone)" -pix_fmt bgr24 -video_size 1280x720 -framerate 25
> -f rawvideo -i "-" -b:a 160k -ar 44100 -pix_fmt yuv420p
> -profile:v baseline -r 25 -g 50 -hls_time 5 -hls_list_size 0
> -hls_segment_filename file%03d.ts -f hls out.m3u8

Complete, uncut console output missing.

Carl Eugen