[FFmpeg-devel] Some patches for v4l2 defaults

[Luca Abeni]

Hi all,

right now, ffmpeg always tries to set the video standard (default: NTSC) 
and the video input (default: 0) when capturing v4l2 video.

After applying the attached patches, ffmpeg will set video standard and 
input only if explicitly requested, leaving them as they are by default.

default_video_standard.diff: sets video_standard default to NULL, which 
means "do not set a video standard (use the currently set one)"

dv1394_support_default_channel.diff: since "0" is a valid video input 
number for v4l2, "-1" will become the default meaning "do not set the 
video channel (use the currently set one)". This patch adjusts dv1394.c 
to cope with "channel == -1"

default_channel.diff: set the default channel to -1.

These patches are by Limin Wang, I just split and slightly modified them.

I think default_video_standard.diff should be pretty safe, and I'll 
apply it on monday if noone objects. For 
dv1394_support_default_channel.diff, I'd like to have the ok from the DV 
maintainer, and I'll apply default_channel.diff as soon as 
dv1394_support_default_channel.diff will be in.


			Thanks,
				Luca
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