av_frame_alloc alone is not enough, you also need to allocate the memory for the image data, e.g. using av_image_alloc
see e.g. https://ffmpeg.org/doxygen/trunk/doc_2examples_2decoding_encoding_8c-example.html On Mon, Jul 12, 2021 at 1:09 PM 李罗 <bruce_lee0...@163.com> wrote: > > > I have already connected and opened camera successfully. But I can not > transfor frame data from AV_PIX_FMT_YUVJ422P to AV_PIX_FMT_BGR24 after > decoding. As I call method sws_scale, 'bad dst iamge pointers' shows up. Any > help will be appreciate, my code: > > > AVFrame* pFrame, * pFrameYUV; > pFrame = av_frame_alloc(); > pFrameYUV = av_frame_alloc(); > > int ret, got_picture; > AVPacket* packet = (AVPacket*)av_malloc(sizeof(AVPacket)); > > struct SwsContext* img_convert_ctx; > img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, > pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_BGR24, > SWS_BICUBIC, NULL, NULL, NULL); > > if (av_read_frame(pFormatCtx, packet) >= 0) { > if (packet->stream_index == videoindex) { > ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, > packet); > if (ret < 0) { > return NULL; > } > if (got_picture) { > sws_scale(img_convert_ctx, (const unsigned char* > const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, > pFrameYUV->linesize); > } > } > av_free_packet(packet); > } > > | | > 李罗 > | > | > 邮箱bruce_lee0...@163.com > | > > 签名由 网易邮箱大师 定制 > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
