/** parse extra data */
if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
/** parse extra data */
if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");