Assertion failed when decoding yuv420p to h264

[ZhaoyungZhang]

Hi, I try to record screen with gdigrab. Then put the screen recording data into the avframe, convert to yuv data via sws_scale, and try to convert yuv420p to h264 using avcodec_send_frame. But when I do:

ret = avcodec_send_frame(pH264EnCodecCtx, pFrameYUV);

I get:
Assertion ((src_linesize) >= 0 ? (src_linesize) : (-(src_linesize))) >= bytewidth failed at libavutil/imgutils.c:314

Why? And how to solve this porblem!

code:
`//Read the data in the recorded screen--->packet
if (av_read_frame(pFormatCtx, packet) < 0)
break;

        if (packet->stream_index == videoIndex) {
            // Decode from screen recording stream, read raw data into pFrame
            int ret = avcodec_send_packet(pDeCodecCtx, packet);
            if (ret < 0) {
                printf("Decoder: send packet failed.\n");
                return -1;
            }
            ret = avcodec_receive_frame(pDeCodecCtx, pFrame);
            if (ret < 0) {
                printf("Decoder: receive frame failed.\n");
                return -1;
            }
            // Convert video frames from screen recording data space format to YUV space format
            sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize, 0, pDeCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);

            // Encode YUV data to h264
            ret = avcodec_send_frame(pH264EnCodecCtx, pFrameYUV);
            if (ret < 0) {
                printf("Encoder: send frame failed.\n");
                return -1;
            }
            ret = avcodec_receive_packet(pH264EnCodecCtx, packet);
            if (ret < 0) {
                printf("Encoder: receive packet failed.\n");
                return -1;
            }`