Bug#585149: iceweasel: No sound in videos using the html5 <video> tag

[Dave Witbrodt]

Madness!

I was checking videos at linux.com today.  Many have been added since I 
last checked.  The first one I clicked on worked fine -- video and 
sound!  But, when I checked Tools->Page Info, I found that it was a 
*.swf (Flash) video.

Then I checked the Allison Randal webm video that was not working 
before... and it still doesn't work:  video, but no sound.

Then I tried this one:

     http://video.linux.com/videos/the-kernel-report

Video and sound both work!  According to Tools->Page Info->Media, this 
is a webm video:

     http://d17mmld7179ppq.cloudfront.net/the-kernel-report_66c085/
     hd_ready.webm

Totally baffling.  It looks like there is something at each site (or 
page) which can be misconfigured and cause Iceweasel to refuse to play 
the video.  Or can sound be encoded in different formats inside a webm 
video, resulting in no audio output?  (But others seem to be able to 
play the videos with sound that I cannot, so that cannot be an 
explanation....)


Bummer,
Dave W.