How can I get I420 frame correctly?

[Magic_YH]

I use libvlc_video_set_callbacks to get the output I420 frames but find I get wrong picture. The code is listed below:

libvlc_video_lock_cb

Code: Select all

vlcCallBackHandler* handler = (vlcCallBackHandler*) opaque; int length = handler->width * handler->height; planes[0] = handler->buff; planes[1] = handler->buff + length; planes[2] = handler->buff + length*5/4; handler->mutex.lock();

And when I check the buff, I found that only first 128000 byte have non-zero data while my test video's size is 1280*720.
In my cognition, planes[0] will save the Y channel and it's size will be width*height, and planes[1] will save U channel and it's size will be (width/2)*(height/2) ans so as the planes[2] save V channel. Is it right?

[RSATom]

You could look my implementation:
https://github.com/RSATom/QmlVlc/blob/m ... ut.cpp#L74