AW: AW: AW: [OT]h.264 alternatives

Tiemo Hollmann TB toolbook at kestner.de
Mon Jul 24 08:41:12 EDT 2017


I think the source of the problem that there is no standard codec for h.264
on windows is, that LiveCode uses the almost deprecated directShow API and
not the current Microsoft media foundation API. For MMF there probably is a
standard codec for h.264 available on the machine.
That’s really a pity, that Edinburgh implemented this old API, which is
almost deprecated and not the current microsoft foundation after having
waited so many years for the switch from QT to a new standard. Now it bites
us again in our daily work, like many years QT. So we went from worse to
bad.
Tiemo


-----Ursprüngliche Nachricht-----
Von: use-livecode [mailto:use-livecode-bounces at lists.runrev.com] Im Auftrag
von Warren Samples via use-livecode
Gesendet: Freitag, 21. Juli 2017 16:31
An: Tiemo Hollmann TB via use-livecode <use-livecode at lists.runrev.com>
Cc: Warren Samples <warren at warrensweb.us>
Betreff: Re: AW: AW: [OT]h.264 alternatives

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 at 128k, 3.04MiB
140          m4a        audio only DASH audio  129k , m4a_dash 
container, mp4a.40.2 at 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 at 128k (best)


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