Decoding h264 frames from RTP stream

Question

I am using live555 and ffmpeg libraries to get and decode RTP H264 stream from server; Video stream was encoded by ffmpeg, using Baseline profile and

x264_param         


        

Answer 1

I suspect the error is in the convert_yuv420p_to_rgb32() code. Try this:

static SwsContext *m_swsCtx = NULL;
QImage frame =  QImage ( m_picture->width, m_picture->height,
                         QImage::Format_RGB32 );
m_swsCtx = sws_getCachedContext ( m_swsCtx, m_picture->width,
                                  m_picture->height, PIX_FMT_YUV420P,
                                  m_picture->width, m_picture->height,
                                  AV_PIX_FMT_RGB32, SWS_BICUBIC,
                                  NULL, NULL, NULL );
uint8_t *dstSlice[] = { frame.bits() };
int dstStride = frame.width() * 4;
sws_scale ( m_swsCtx, &m_picture.data, &m_picture.linesize,
            0, m_picture->height, dstSlice, &dstStride );

You will need to include/link swscale if you have not does so already.

Note: you don't need SPS/PPS every frame (on keyframes is good enough). But it doesn't hurt either.