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Re: More on scrolling spectrograms

Subject: Re: More on scrolling spectrograms
From: "rock_scallop" rock_scallop
Date: Sun Jan 13, 2013 10:20 am ((PST))
Thanks, Peter. I do not mean jerky like fits and starts, but rather a slightly 
uneven flow like a bicycle wheel with somewhat worn bearings. It may just be 
from the youtube. Anyway, it is pretty darn cool.

John Hartog
rockacallop.org

--- In  Peter Shute  wrote:
>
> I ended up using sox, the command line audio program, to dump the image. Not 
> quite as good as some of the other programs I tried, but it has the advantage 
> that I have full control of the scales, and I can now probably automate the 
> whole process.
> 
> It will only create an image a maximum of 5000 pixels wide (3 minutes at the 
> scale I chose), so I had to join dozens of them together, but that can be 
> automated too. The program authors have agreed to increase it to 200,000 
> pixels in the next release, probably sometime this year. All the other 
> programs I tried had some sort of limit, generally less than half an hour, 
> after which they'd crash or include random data in the image, or refuse to 
> dump. I only looked at free programs.
> 
> What do you mean by jerky? The scrolling, or the audio itself? Either way, 
> you'd think it would be better when it's not being streamed from the 
> Internet. It's also been twice compressed - once by me to get it small enough 
> to upload, and once by YouTube in unknown ways.
> 
> My main incentive for doing this was to make spectrograms of my recordings 
> more accessible to birders who don't know how to create their own. I find 
> that if I ask for expert advice about the id of a bird calling softly in the 
> background of a dawn chorus, for example, people often can't understand which 
> bit I mean. This way I can draw labels on the spectrogram image before I turn 
> it into a movie, and hopefully it'll assist them, at least with the timing of 
> the call.
> 
> Another idea I had recently was to put movies of new recordings onto my iPad. 
> That would let me review them more efficiently, in bed, on the train, etc, 
> than just listening to audio. I wish I could make notes directly on the movie 
> frames.
> 
> Sent from my iPad
> 
> On 13/01/2013, at 3:31 PM, "rock_scallop" > wrote:
> 
> 
> 
> Hi Peter,
> What do you mean by "dumped spectrogram images?" What are you using to 
> generate the images to be dumped?
> Nice sounds. I played the long one for a little while, a wee bit jerky but I 
> think it's acceptable for an online viewing. Would it play smoother as a 
> download or DVD video?
> 
> John Hartog
> rockscallop.org 
> 
> --- In  , "Marc Myers" wrote:
> >
> > There are shortcomings to Acousmographe but I've used it for some time. My 
> > original solution was to convert the Flash movie to another format with SWF 
> > & FLV toolkit. Lately I've been using Premiere CS5, I import the FLV file, 
> > then add the original audio. Then output to whatever file format I wish. 
> > The advantage of Acousmographe is one can annotate.



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