yuvj420p stream cannot be viewed about kxmovie

[kristopherjohnson]

It looks like this change might fix the problem with processing of yuvj420p:

- (BOOL) setupVideoFrameFormat: (KxVideoFrameFormat) format
{
    if (format == KxVideoFrameFormatYUV &&
        _videoCodecCtx &&
        (_videoCodecCtx->pix_fmt == AV_PIX_FMT_YUV420P || _videoCodecCtx->pix_fmt == AV_PIX_FMT_YUVJ420P)) {

        _videoFrameFormat = KxVideoFrameFormatYUV;
        return YES;
    }

    _videoFrameFormat = KxVideoFrameFormatRGB;
    return _videoFrameFormat == format;
}

Unfortunately, the sample still doesn't work with the Axis camera, but that is apparently due to a framerate issue. frame.duration gets set to zero (because av_frame_get_pkt_duration() always returns zero)), so the app thinks time does not pass and never renders a frame. If I hack it to force it to render a frame when a frame is available, then that frame is displayed properly, so I think the YUV frame decoding is working. Now I just have to figure out the framerate timing.

[kolyvan]

Hi,

Take a look at new branch juvj420p https://github.com/kolyvan/kxmovie/tree/yuvj420p
I added a fix for zero-length frames like you got from web-camera.
And also there is your fix for yuvj420p streams from comment above.

Best wishes.

[kristopherjohnson]

Thanks! That's working pretty well.

My only complaint is that the video displays for a few seconds at a time, then the spinning wheel appears for a couple of seconds while the HUD says "buffering", and then the video displays again, and this cycle keeps going. I'll look at the code, and also check whether the camera is actually generating a continuous stream, but do you know an easy way to get a continuous display without the buffering pauses?

[itkingdom]

The buffering issues are also happened while I'm trying 1080p stream. I think we need a new way to handle buffer ^^

[kolyvan]

See commit bc398e2
I added ability to completely disable buffering via setting KxMovieParameterMinBufferedDuration parameter to zero.

parameters[KxMovieParameterMinBufferedDuration] = @(0.0f);

For testing, uncomment line 212 in KxMovieExample/MainViewController.m and play your rtsp stream.

[kristopherjohnson]

That's working perfectly.

Thank you for all your assistance.

[kolyvan]

Thank you for your contribution in project.
I merged branch yuvj420p into master.