On 2000.12.27 01:32:20 +0100 Olive Tao wrote: > Hi , > > > I am new to Linux world and need to complete a decoder class of V4L > driver > in short time. I can not find step by step information regarding how to > debug a modular driver under Linux. > > Can anyone help to let me know how to debug a device driver in Linux > environment such as V4L driver. Having 2/3 of a picture and no color is very characteristic for pal/ntsc mixups, I don't think you have to debug the v4l driver since you have captured jpegs with the right settings yourself. I think you should look at the capture code of streamer and see if the norm settings are handled the right way. This is done with the VIDIOCGCHAN and VIDIOCSCHAN ioctls. I think it will be the easiest to compare the calls to this ioctl of streamer with the program that you used for the jpeg capture. Jeroen
