[FFmpeg-user] Audio delayed with DeckLink
cus at passwd.hu
Fri Oct 14 00:00:58 EEST 2016
On Thu, 13 Oct 2016, PSPunch wrote:
> On Win7 x64, Capturing SDI from DeckLink Duo 2.
> When encoding with FFmpeg, audio seems to be about 100ms later than
> video. Is there a known solution to this, or is there a way to delay
> video by roughly 100ms?
I tested the DeckLink drivers on Linux, and they very often fail to
provide proper timestamps for the audio and video they produce, there is
also a noticable clock skew after a few hours if you use their video
clock, and they also skip frames (different number of audio and video
frames) in the event of a signal loss.
To work around this problem, there are the audio_pts and video_pts
options, so you can customize where you want your timestamps to come
from. In my experience, wallclock is the only thing that works
reliably, so I typically use these options:
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