25 May
2010
25 May
'10
10:30 p.m.
On May 25, 2010, at 8:02 PM, Niels Mayer wrote:
What is the particular advantage of EDL, versus
something more standard:
http://www.w3.org/TR/SMIL/
http://en.wikipedia.org/wiki/Synchronized_Multimedia_Integration_Language ??
"more standard" is relative and depends on the point of view.
EDL (as in formats such as CMX3600) is certainly dated, but still common in
Film-production (it can be read by a human with a scissor & tape).
Basically that's why I asked about the use-cases or the goal of this
'exercise'.
From what I can tell about looking at Drew's perl script he's not trying to
interpret 'classic' EDL; and just used the term to get the idea across. SMIL would
certainly be the better option, though it may be overkill as well..
Mplayer (and thus
http://en.wikipedia.org/wiki/K-Multimedia_Player ,
smplayer, and gnome-mplayer) supports SMIL although the support is
rudimentary. SMIL and other means of setting clips&playlists is
available in the flash-based 'jwplayer' http://www.longtailvideo.com
"Attribution-NonCommercial-ShareAlike 3.0 Unported" ( in action:
http://nielsmayer.com/xwiki/bin/view/Macros/JWPlayerJSPL_Test and
http://nielsmayer.com/xwiki/bin/view/Exhibit/NPRpods3 (work in progress) ).
The other issue w/ doing it "in the player" is how well do the given
players handle a playlist. Most of them, even if accessing the same
media in different cue-locations, do not do a very good job with going
through "clips" with seamless transitions between the clips. However,
it's readily possible , with a bit of pre-buffering and pre-fetching
that allows seamless synchronized playback .... just a small matter of
programming...
been there, done that and using libsndfile this just works and is pretty
straight-forward.
However other decoder libraries are not very predictable when it comes to accurate
seeking.
In particular ffmpeg's av_seek_frame() and libqt's quicktime_set_audio_position()
are not very precise.
The only reliable way to do this correctly with said libs would be to always start
decoding from the beginning or to stick to a limited set of codecs. OTOH you may or may
not care about +-1920 audio-samples.
(i waste way too much time abusing my own software
for
unintended purpose -- "internet sampler and looper"
--http://nielsmayer.com/ts-episode-timeline.png )
Niels
http://nielsmayer.com
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