Post History

Why is interlaced footage still being used in professionally-produced videos shot with high-end cameras?

I am not a video expert, but I am sometimes surprised to see interlaced footage in professionally-produced videos shot with high-end cameras. This often gives "combing" artifacts to videos (Youtube videos for example). Some prominent examples can be found in the following videos:

- *PBS News Hour*: the man's arms moving at time 01:42 in [this video](https://www.youtube.com/watch?v=bsBXpt5RIsQ&t=1m42s)

- *Street League Skateboarding*: the skateboarder doing an ollie at time 19:57 in [this video](https://www.youtube.com/watch?v=TQc5Z1zRaic&t=19m57s)

It is surprising to me that such professional productions have these artifacts, which significantly reduce the video quality. My questions are:

- Am I correct to assume that these artifacts are due to the camera shooting interlaced video?
- Why is interlacing still used in modern cameras and broadcasts, when it seems that most people are watching on their computers or on streaming services?
- Why isn't the interlaced footage deinterlaced before it is posted to a website like Youtube, which [only supports progressive video](https://support.google.com/youtube/answer/1722171?hl=en)?