[Libav-user] AVERROR_INVALIDDATA in avformat_open_input on Raspberry Pi

[Carl Eugen Hoyos]

Blair Azzopardi <blairuk at ...> writes:

>     ret = avformat_open_input(&fmt_ctx, "/dev/video0", NULL, NULL);

> I note in the above code sample I am using a null AVFormatContext.

Sorry, I missed this.
You cannot auto-detect video4linux, you have to 
set it as format, before calling avformat_open_input().

Just compare "ffmpeg -i /dev/video0" with 
"ffmpeg -f v4l2 -i /dev/video0"

Carl Eugen