[FFmpeg-user] Decklink with ffmpeg audio desync

Dpto. Datos Television Costa Blanca datos at tvt-datos.es
Thu May 12 10:27:36 CEST 2016

El 11/05/2016 a las 23:42, Marton Balint escribió:
> With -ar 44100 you are resampling the initial sample rate of the captured
> source (48000) to 44100. You are also manually specifying a resample
> filter with -af resample. Try your encoding without these options.
I've removed both options yesterday (figured it out) and video/audio 
still desyncing.

The actual command is:

./ffmpeg -re -f decklink -i "DeckLink SDI 4K at 2" -c:v mpeg2video -pix_fmt
yuv420p -aspect 16:9 -deinterlace -sc_threshold 1000000000 -b:v 3.5M
-minrate:v 3.5M -maxrate:v 3.5M -bufsize:v 2.4M -acodec mp2 -ac 2 -b:a
128k-metadata service_name="TVT" -mpegts_service_id 123 -f mpegts

Just for info, the SDI input comes from a matrix that when switch betwen sources have a little delay and ffmpeg return a NO INPUT SIGNAL DETECTED -> INPUT SIGNAL DETECTED.

Can the desync come from here?


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