[Libav-user] Help with sws_scale

[Arthur Muller]

Hello,

 

I'm trying to convert an RGB image to YUV to generate a video. My image is
sized 640 x 480. These are my steps:

 

unsigned char rgbdata[3*640*380]; // contains my rgb data

uint8_t *inData[1] = { rgbdata };

int inLinesize[1]  = { 3*640 };

AVFrame *frame;

 

frame = av_frame_alloc();

frame->format = AV_PIX_FMT_YUV420P;

frame->width  = 640;

frame->height = 480;

av_frame_get_buffer (frame,32);

 

sws_ctx = sws_getContext
(640,480,AV_PIX_FMT_RGB24,640,480,AV_PIX_FMT_YUV420P,SWS_FAST_BILINEAR,0,0,0
);

sws_scale(sws_ctx,inData,inLinesize,0,480,frame->data, frame->linesize);

 

I do have checks after allocating the frame and getting the context,  but I
removed them here for clarity. The program crashes in sws_scale.

 

Can anybody point me in the right direction?

 

Thanks.

 

-Arthur

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