www not working

Before you spend hours of working on Nginx config etc., check your domain’s DNS records.

You need to have a record resembling this:


Hostname/Name: http://www.your.website

Value: your.website

TTL (seconds): 3600

And in Nginx you need to capture http://www.your.website (port 80) and redirect it to https://your.website (port 443). Something like this:

server {
    listen 80;
    server_name www.your.website
    return 301 https://your.website$request_uri;

ffmpeg: Non-monotonous DTS in output stream 0:0 – Video Generation Series (Part 2) [ERROR]

This error occured when I used ffmpeg to concatenate different videos that I generated:

ffmpeg -f concat -safe 0 -i list.txt -c copy final_video.avi -y
BTW, if you want to run ffmpeg or any other command inside a python script (a very reasonable idea), use subprocess:

command = "ffmpeg -f concat -safe 0 -i list.txt -c copy final_video.avi -y"
subprocess.Popen(command.split(), stdout=subprocess.PIPE)

As a result – the videos got smashed together – some frames even never appeared.

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