[FFmpeg-user] Recording logitech ultra vison,

[Paul Gardiner]

On 07/06/2011 10:33, Sw at g wrote:
> Hi all,
>
> I am recording my Logitech Ultra Vison using ffmpeg with the following
> command,
>
> "ffmpeg -f video4linux2 -i /dev/video0 -s 640x480 -vcodec mpeg4 -sameq
> cam_`date +%F_%T`.mp4"
>
> However the video quality isn't as it's best, if I am using mencoder
> (which I understand isn't maintain any more) with x264 codec then the
> picture is much clearer and sharp (same size than ffmpeg)
>
> If I am trying to record the webcam with ffmpeg and libx264 (with the
> -vpre medium option) than the picture quality is the same as mpeg4 codec.

I've recently been using ffmpeg with libx264 to transcode from some
BBC HD recordings and the results were indistinguishable from the
original. I was doing it in a way that avoided any scaling, so I
wonder if the loss of sharpness is because of the scaling stage.

Paul.