pipeline

问题 I have this pipeline to record from two webcams simultaneously: gst-launch-1.0 -v v4l2src device=/dev/video0 num-buffers=300\ ! "video/x-raw,width=800,height=600,framerate=30/1" ! videorate\ ! "video/x-raw,framerate=30/1" ! jpegenc ! queue ! mux. \ pulsesrc device="alsa_input.pci-0000_00_1b.0.analog-stereo" \ ! 'audio/x-raw,rate=88200,channels=1,depth=24' ! audioconvert ! \ avenc_aac compliance=experimental ! queue ! mux. matroskamux name="mux"\ ! filesink location=/home/sina/T1.avi v4l2src

问题 Guys. I met a problem that: I am developing a R shiny app and I want to highlight some values in the datatable. I have a dataframe(entities) and a vector(vec1), and I want to highlight a specific value in each column when the value in each column is equal to the value in a vec1. Now I achieved it by repeating the formatStyle code 25 times, but I believe it can be done by writing a loop. Could anyone help me? vec1 = c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25) datatable

问题 I've written a small program (with code from SO) that does printenv | sort | less and now I want to add error-handling with perror and checking the return values. I've never done this before but I suppose it is similar to exception handling. I need to check errors for execvp, fork, pipe and dup2. I have this code #include <sys/types.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> struct command { const char **argv; }; /* Helper function

问题 I made the following code that I will present below to create a web crawler (elaborated in scrapy) and I want to put this data in a database, the one being mysql. For this I used the pipeline file and made the following configurations: pipeline.py: class ScrapySpiderPipeline(object): def __init__(self): engine = db_connect() create_table(engine) self.Session = sessionmaker(bind=engine) def process_item(self, item, spider): session = self.Session() quotedb = QuoteDB() quotedb.Titulo = item[

问题 I have created a function that reads a directory listing and then the files contents for CNC program names/numbers. Each file have multiple program numbers which i have separated by "," and are passed on as a obj (see code below). I want to export this to XML to upload to a database having each of the program names in a seperate entry. Whats the best/easiest method to achieve this? $obj = New-Object -TypeName PSObject $obj | Add-Member -MemberType NoteProperty -Name FullFileName -Value

问题 Had to rewrite this post with the actual code since there must be some kind of difference with binary modules. The full cmdlet is as follows (apologies for length): In a nutshell, this function basically uses the SMO library and pulls information about a database users from a SQL Server Instance. namespace Namespace { using Microsoft.SqlServer.Management.Smo; using System; using System.Collections.Generic; using System.Management.Automation; using static PrivateFunctions; [Cmdlet(VerbsCommon

问题 Question I get count for lines of code for only one file in the array of type PSCustomObject . Rest all entries in the array error out with following message - Get-Content : Cannot bind argument to parameter 'Path' because it is null. At line:42 char:100 ... -Content -Path $files.UncommentedFileName) | Measure-Object -Line | Select-Objec ... How do I overcome this error and display the lines of code for all the files in the array? Constraints I intend to re-use the function Remove-VBComments

问题 I've estimated a logistic regression using pipelines. My last few lines before fitting the logistic regression: from pyspark.ml.feature import VectorAssembler from pyspark.ml.classification import LogisticRegression lr = LogisticRegression(featuresCol="lr_features", labelCol = "targetvar") # create assember to include encoded features lr_assembler = VectorAssembler(inputCols= numericColumns + [categoricalCol + "ClassVec" for categoricalCol in categoricalColumns], outputCol = "lr_features")

问题 There is a program (which I cannot modify) that creates two output files. I am trying to write a Python wrapper that invokes this program, reads both output streams simultaneously, combines the output, and prints to stdout (to facilitate streaming). How can I do this without deadlocking? The following proof of concept below works fine, but when I apply this approach to the actual program it deadlocks. Proof of concept : this is a dummy program, bogus.py , that creates two output files like

问题 Is there a library or recommended way for creating an iterator pipeline in Python? For example: >>>all_items().get("created_by").location().surrounding_cities() I also want to be able to access attributes of the objects in the iterators. In the above example, all_items() returns an iterator of items, and the items have different creators. The .get("created_by") then returns the "created_by" attribute of the items (which are people), and then location() returns the city of each person, and