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Re: [Gnash-dev] Saved media not quite right

From: John Gilmore
Subject: Re: [Gnash-dev] Saved media not quite right
Date: Thu, 12 Feb 2009 14:10:42 -0800

> >
> This video, md5sum 8f75636dc86ff26271495a58708d2588, uses AAC audio,
> which doesn't yet work in Gnash (at least, it never has for me). Gnash
> should pop up a message saying that, as of yesterday. Totem (gstreamer)
> won't play it (AAC is more apparently more patent-encumbered than MP3),
> a recent packaged ffplay has poor image decoding and no sound. ffplay
> from ffmpeg trunk is fine, and so is the packaged mplayer (both sound
> and video perfect). Dragon (gstreamer), xine and vlc have good video, no
> sound in the default installation.
> So yes, if your md5sums match mine, the downloaded streams are fine. The
> problem is that codec support for AAC, H264, and possibly even FLV is
> dubious...

Hmm!  I get a different md5sum.  In fact, for the same movie from that
URL, I have saved six copies.  There are four different versions among
them.  Here are the differences between them:

bash-3.2$ ls -l /home/gnu/gnash-media/* | grep 4801845
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 05:15 
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 11:58 
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 12:17 
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 12:21 
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 13:54 
-rw-r--r-- 1 gnu uucp  4801845 2009-02-12 13:57 
bash-3.2$ md5sum /home/gnu/gnash-media/{1,2[2-6]}
bash-3.2$ cmp -l /home/gnu/gnash-media/[45]
    285  64 104
    286 101  60
    288 104  65
    289  66 106
    290  67  71
bash-3.2$ cmp -l /home/gnu/gnash-media/[23]
    291  64  60
bash-3.2$ cmp -l /home/gnu/gnash-media/{1,22}
    289  60  66
    290 106  67
    291  60  64

I'm not sure what to make of this.  Either gnash is storing them
differently, or YouTube is serving them up differently, (or somebody
along the Intertubes is modifying the streams on their way to me).

I have temporarily put these six copies up for your inspection at:*

(using the above six names).  Curious!


PS: Hardy's Totem/Gstreamer can't decode any of them (even tho I have
the AAC codec installed on this machine for testing, else gnash
wouldn't be able to play it).  Perhaps we should pass our
swfdec-inspired decoding hacks upstream to the gstreamer folks, if
they don't have the equivalent by now.

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