cannot download 1920X1080 HD Youtube video although I can play the video in 1920X1080 HD on Youtube

[oct2016...@gmail.com]

Hi, recently I noticed that I cannot download 1920X1080 HD Youtube videos although I can play those videos in 1920X1080 HD on Youtube, especially Youtube videos that're uploaded since November this year. When I tried to use Download Helper, the 1920X1080 option is not available at all. For example : http://www.youtube.com/watch?v=4HalbYwEHzw

Someone said that "YouTube switched to adaptive streams and uses separate files for video and audio, which need to be merged to get a video file. This is more complicated and requires more advanced tools (ffmpeg)", I don't know if this has anything to do with this or could it be because Youtube improves support for HDR videos recently. May I ask if anyone can please shed some light on this and inform me how can I use this add-on to download videos in full HD (1920X1080)? Many thanks in advance.

[mig]

For several years, YouTube videos has only streamed videos with a resolution higher than 720p in adaptive mode (called ADP in VDH). VDH handles this with the help of an external application we call converter, and once installed, this is transparent to you.

In the case of http://www.youtube.com/watch?v=4HalbYwEHzw, the video is not only in ADP, but each audio and video part is streamed in DASH mode (small chunks to be reassembled).

VDH 6.1.1 does not support this, but VDH 6.2.0 will. If you want, you can install now the 6.2.0b5 development version from https://addons.mozilla.org/en-US/firefox/addon/video-downloadhelper/versions/ , you will then see an entry as DASH streaming - ADP - 1920x1080 - 41:42 - MP4 . If you download it, you will end up with a single audio+video file that you will be able to play.

[oct2016...@gmail.com]

Many thanks for your great help, mig!   =)