[FFmpeg-user] Blackmagic card issue capturing

Roger Pack rogerdpack2 at gmail.com
Tue Mar 1 20:53:50 CET 2016

On 3/1/16, Christian Bianchini <christian.bianchini at euservers.net> wrote:
> I have got the ffmpeg version N-78598-g98a0053  and trying to capturing
> from a Blackmagic card, which sometimes works and sometimes doesnt.
> ffmpeg.exe -y -f dshow -video_size 1920x1080 -pixel_format uyvy422
> -rtbufsize 2100 -framerate 59.94 -i "video=Decklink Video Capture" -codec:v
> libx264 -preset ultrafast -an -crf 0 test.mkv
> The issue is a not recording at 60 FPS but at  0.. 2...1.3.....0.. and the
> file doesnt get big.
> After I stop and restart the process, it captures at 60FPS without issues
> and the video is great, but I dont get why I need to restart 3-4 times to
> get the record working.
> this the output that I get when it doesnt work:

Appears to not be receiving input.  If you wait awhile it never works?
What if you add -loglevel verbose (to the failing runs)?
Unfortunately nothing comes to mind...

More information about the ffmpeg-user mailing list