[FFmpeg-user] ffmpeg audio distortion using blackmagic

Carl Zwanzig cpz at tuunq.com
Tue Jul 24 01:58:48 EEST 2018

On 7/23/2018 3:47 PM, Marton Balint wrote:
> On Mon, 23 Jul 2018, Flumotion Support wrote:
>> If I understood you correctly to avoid corruption, I need to add the option
>> -async 1 -vsync 1 in my ffmpeg pipeline is this correct?,
> No, for "frame sync" I meant a real hardware frame synchronizer device.

I'm not sure why a frame sync would help what's otherwise an un-timed SDI 
signal unless there are a ton of uncorrected errors (and you'll still have 
artifacts). Also what would you use as a clock for the frame sync? Without 
one it's not really useful.

To the OP- Have you tried capturing using the BMD desktop app? Does it 
record clean audio? Can you record with ffmpeg to disk w/o problems?



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