The correct way to concat multiple video files from m3u8 playlist is ffmpeg -i “http://example.com/chunklist.m3u8” -codec copy file.mp4 the m3u8 playlist can be on web or locally in directory it contains list of file paths relative to the playlist -codec copy to avoid encoding (which takes time) container type matters: *.mp4 is fine but it … Read more
np.r_ is implemented in the numpy/lib/index_tricks.py file. This is pure Python code, with no special compiled stuff. So it is not going to be any faster than the equivalent written with concatenate, arange and linspace. It’s useful only if the notation fits your way of thinking and your needs. In your example it just saves … Read more
The best way to handle this is to use one of the HTML injectors from the get-go. I’m using gulp-inject to some success so far. Add gulp-inject to your project: npm i –save-dev gulp-inject Assuming that you have a folder layout similar to this: build/ src/ index.html less/ main.less js/ app.js Your HTML should include … Read more
If you are looking for performance only I believe that using StringBuilder/StringBuffer is the most efficient way to build strings. Even if the Java compiler is smart enough to translate most of String concatenations to StringBuilder equivalent. If you are looking for readability the String.format thing is the much clearer I think, and this is … Read more
Use the COALESCE function to replace NULL values with an empty string. SELECT Column1 + COALESCE(Column2, ”) AS Result FROM YourTable
You simply can’t do that in SQL. You have to explicitly list the fields and concat each one: SELECT CONCAT(field1, “https://stackoverflow.com/”), CONCAT(field2, “https://stackoverflow.com/”), … FROM `socials` WHERE 1 If you are using an app, you can use SQL to read the column names, and then use your app to construct a query like above. See … Read more
Have a look at this DECLARE @Reviews TABLE( ReviewID INT, ReviewDate DATETIME ) DECLARE @Reviewers TABLE( ReviewerID INT, ReviewID INT, UserID INT ) DECLARE @Users TABLE( UserID INT, FName VARCHAR(50), LName VARCHAR(50) ) INSERT INTO @Reviews SELECT 1, ’12 Jan 2009′ INSERT INTO @Reviews SELECT 2, ’25 Jan 2009′ INSERT INTO @Users SELECT 1, ‘Bob’, … Read more
Copying can hardly be avoided if you want it in the same memory chunk. If the allocated chunk is large enough you could use memmove to shift the original string by the length of what you want to prepend and then copy that one into the beginning, but I doubt this is less “clunky”. It … Read more
If the columns are always in the same order, you can mechanically rename the columns and the do an append like: Code: new_cols = {x: y for x, y in zip(df_uk.columns, df_ger.columns)} df_out = df_ger.append(df_uk.rename(columns=new_cols)) Test Code: df_ger = pd.read_fwf(StringIO( u””” index Datum Zahl1 Zahl2 0 1-1-17 1 2 1 2-1-17 3 4″””), header=1).set_index(‘index’) df_uk … Read more