On 07/21/2017 03:45 AM, Tiemo Hollmann TB via use-livecode wrote:
But I wonder, which codec youtube converts all videos into or other
platforms are using so that their videos are almost always compatible with
all platforms. There must be any cross-platform codec or the browser video
players bring all available codecs with them
They make files available in more than one format to accommodate various
browsers. The player and the browser negotiate which file to use. This
is the common solution to the problem.
If you visit a youtube URL with youtube-dl using the -F option you'll
see something like this, listing the associated files:
[youtube] NSEISkSfzIg: Downloading MPD manifest
[info] Available formats for NSEISkSfzIg:
format code extension resolution note
139 m4a audio only DASH audio 49k , m4a_dash
container, mp4a.40.5@ 48k (22050Hz), 1.23MiB
249 webm audio only DASH audio 68k , opus @ 50k, 1.46MiB
250 webm audio only DASH audio 103k , opus @ 70k, 2.09MiB
171 webm audio only DASH audio 124k , vorbis@128k, 3.04MiB
140 m4a audio only DASH audio 129k , m4a_dash
container, mp4a.40.2@128k (44100Hz), 3.28MiB
251 webm audio only DASH audio 181k , opus @160k, 3.89MiB
160 mp4 192x144 DASH video 109k , avc1.4d400c,
12fps, video only, 2.71MiB
133 mp4 320x240 DASH video 246k , avc1.4d400d,
24fps, video only, 6.09MiB
17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k
36 3gp 320x240 small , mp4v.20.3, mp4a.40.2
18 mp4 320x240 medium , avc1.42001E, mp4a.40.2@ 96k
43 webm 640x360 medium , vp8.0, vorbis@128k (best)
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