[FFmpeg-user] Blackmagic card issue capturing

Moritz Barsnick barsnick at gmx.net
Tue Mar 1 16:04:35 CET 2016

Hi Christian,

On Tue, Mar 01, 2016 at 14:40:17 +0000, Christian Bianchini wrote:

I have no idea about dshow, but:

> ffmpeg.exe -y -f dshow -video_size 1920x1080 -pixel_format uyvy422 -rtbufsize 2100 -framerate 59.94 -i "video=Decklink Video Capture"

Why do you specify "-rtbufsize 2100"? The default is 3041280, so what
you chose is extremely small. Do you have absolutely no memory

And so the input device handler complains:

> [dshow @ 000000861104b5a0] real-time buffer [Decklink Video Capture] [video input] too full or near too full (197485% of size: 2100 [rtbufsize parameter])!

I have no idea why it actually works after a few tries.


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