Been trying these techniques, but I keep getting crashes. Help please?:
avpicture_fill((AVPicture*) frame2, frame2_buffer,
PIX_FMT_RGB24, width2, height2);
//printf("data = %d, %d, %d, %d
\n",frame2->data[0],frame2->data[1],frame2->data[2],frame2->data[3]);
//printf("linesize = %d %d %d\n",frame2->linesize[0],
frame2->linesize[1], frame2->linesize[2]);
//printf("width = %d\n", pCodecCtx->width);
//printf("height = %d\n", pCodecCtx->height);
//std::cin.get();
int linesize = frame2->linesize[0];
for(int xx = 0; xx < (linesize * width1)-1; xx += 3)
{
int r = frame2->data[0][xx];//int r = frame2->data[0][xx];
int g = frame2->data[0][xx+1];
int b = frame2->data[0][xx+2];
printf("xx=%d r=%d, g=%d, b=%d \n",xx, r,
g, b);
}
printf("frame%d done----------------",i++);
//for(int xx = 0; xx < width1; xx = xx + 3)
//{
// for(int yy = 0; yy < height1; ++yy)
// {
// //int p = xx*3 + yy*frame2->linesize[0];
// //int p = xx * 3 + yy * linesize;
// printf("yy=%d xx=%d",yy,xx);
// int p = yy * linesize + xx;
// printf("p=%d\n",p);
// int r = frame2->data[0][p];
// int g = frame2->data[0][p+1];
// int b = frame2->data[0][p+2];
// printf("[r=%d, g=%d, b=%d ]\n", r, g, b);
// }//for
//}//for
Nav
On 11/20/2012 8:52 AM, Nav wrote:
Hi! Glad to be part of this mailing list.
What I wanted to create, was a program which would receive a streaming
video, and when it decodes a frame of the video into either a bitmap
format or just pure RGB (perhaps stored in a char array), it would
notify another program that it has received a frame, and the other
program would take the RGB values and display it.
I've already asked this question here:
http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=15&t=805
and rogerdpack told me to post my question on the libav mailing list.
I have been through many websites, but they either use img_convert
(which doesn't work) or sws_scale, which crashes when I try to use it
with RGB.
Could anyone help with a complete piece of code which can give me the
RGB values of a frame?
This is a part of the YUV conversion that I tried initially.
i=0;
while(av_read_frame(pFormatCtx, &packet) >= 0)
{
// Is this a packet from the video stream?
if(packet.stream_index==videoStream)
{
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished)
{
// Convert the image into YUV format that SDL uses
sws_scale( sws_ctx, (uint8_t const * const *)pFrame->data,
pFrame->linesize, 0, pCodecCtx->height, pict.data, pict.linesize );
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