Hello everybody, I'm new to the mailing list and discovering libav. 3 days long I've been struggling to code a small experimental app that pretends to transform RGB24 pixels buffers (provided by the framework I use, which is OpenFramework) to a h264 file.
I've almost reached the finish line, but still have a problem : the encoded h264 has some color artifacts. You can see one frame here, for example : http://pasteboard.co/KYNkeOoFm.png 1) I'm on Raspbian, compiled my own version of libav. I can assure that there is no "mix" between this libav and the system's one. Included files, linked libraries are from the libav I've compiled. I used libav 12. 2) below are my app relevant sections, without error checking - Can you see something wrong ? I tried everything I could. Thanks in advance for your help... INIT METHOD EXCERPT avcodec_register_all(); codec = avcodec_find_encoder(codec_id); c = avcodec_alloc_context3(codec); c->bit_rate = 400000; c->width = width; c->height = height; c->time_base = (AVRational){1, 25}; c->framerate = (AVRational){25, 1}; c->gop_size = 10; c->max_b_frames = 1; c->pix_fmt = AV_PIX_FMT_YUV420P; avcodec_open2(c, codec, NULL); f = fopen(filename, "wb"); frame = av_frame_alloc(); frame->format = AV_PIX_FMT_RGB24; frame->width = c->width; frame->height = c->height; int ret = av_frame_get_buffer(frame, 0); tmp_frame = av_frame_alloc(); tmp_frame->format = AV_PIX_FMT_YUV420P; tmp_frame->width = c->width; tmp_frame->height = c->height; ret = av_frame_get_buffer(tmp_frame, 0); pkt = av_packet_alloc(); sws_context = sws_getContext(c->width, c->height, AV_PIX_FMT_RGB24, c->width, c->height, AV_PIX_FMT_YUV420P, 0, 0, 0, 0); ENCODE_FRAME METHOD void Encoder::encode_frame(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt, FILE *outfile) { int ret; ret = avcodec_send_frame(enc_ctx, frame); while (ret >= 0) { ret = avcodec_receive_packet(enc_ctx, pkt); if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) return; else if (ret < 0) { fprintf(stderr, "error during encoding\n"); exit(1); } fwrite(pkt->data, 1, pkt->size, outfile); av_packet_unref(pkt); } } ENCODE METHOD This method is called every time a new pixel buffer is available void Encoder::encode(const uint8_t *pixels) { av_frame_make_writable(frame); av_frame_make_writable(tmp_frame); av_image_fill_arrays(frame->data, frame->linesize, pixels, AV_PIX_FMT_RGB24, c->width, c->height, 32); av_image_alloc(tmp_frame->data, tmp_frame->linesize, c->width, c->height, AV_PIX_FMT_YUV420P, 32); sws_scale(sws_context, frame->data, frame->linesize, 0, c->height, tmp_frame->data, tmp_frame->linesize); tmp_frame->pts = ++frame_pts; encode_frame(c, tmp_frame, pkt, f); // Do I need to free something here ?? // av_freep(&tmp_frame->data[0]); } _______________________________________________ libav-api mailing list libav-api@libav.org https://lists.libav.org/mailman/listinfo/libav-api
