av_const int ff_h263_aspect_to_info(AVRational aspect);
int ff_h263_decode_init(AVCodecContext *avctx);
int ff_h263_decode_frame(AVCodecContext *avctx,
av_const int ff_h263_aspect_to_info(AVRational aspect);
int ff_h263_decode_init(AVCodecContext *avctx);
int ff_h263_decode_frame(AVCodecContext *avctx,