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Topic: Watching the bitrate.... (Read 5290 times) previous topic - next topic
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Watching the bitrate....

I've been playing with the source code for ogg123 and added in some lines to print to a file the instantaneous bitrates so I can plot them w.r.t.

Anyway, after a short 5 min mucking around, I got these two beautiful graphs to share with everyone.  (x axis is time in seconds, y axis is bitrate in kbps)

Bitrates for GT3b1 (q5) on harp40_1.wav



Enjoy

Watching the bitrate....

Reply #1 –
You can try an oggspot that I've written some time ago for that purpose, rather than using ogg123.

It's still early development, but should suffice for what you wanted.

I wanted to do something in the lines of what EncSpot does, but have no time for that now.
- Eugene 'HMage' Bujak

Watching the bitrate....

Reply #2 –
Can you post a win32 binary, please ?

Watching the bitrate....

Reply #3 –
This program does not have a GUI yet, I don't have time for that.

But here's the gnuplot-generated graph of Linkin Park - In The End for each block:


Axis X - time, in seconds.
Axis Y - bitrate, in bits per second.

Every vorbis block is represented as dot on this graph.
Encoded with libvorbis 1.0 and oggenc 1.0 with -q5 key.

We can see practically three layers of different block types - near-nominal (most of the stream), high-bitrate (presumably, on sharp attacks and hard to encode blocks), and low-bitrate (presumably, on very easy to encode blocks).


Here's graph of the same song encoded with libvorbis 20030903 CVS:



And here's encoded with Garf's GTune 3 beta 1 (linux binary from his webpage):



To see the difference between libvorbis 1.0 and libvorbis 20030903 CVS, you'll need to open these files in two windows and switch between them:
Encoded with libvorbis 1.0
Encoded with libvorbis 20030903 CVS

I observe that all short blocks with high bitrate now use more bytes. Same tendency on low-bitrate blocks - they have now more bits for detail.


Encoded with Garf's GTune3b1

The picture of Garf's GTune is drastically different - the bitrate scale of graph has to be adjusted, since it adds another very-high-bitrate layer of blocks, moving half of them from high-bitrate layer. Also, this encode also adds a teeny bit of just-below-nominal bitrate blocks too.
- Eugene 'HMage' Bujak
 

Watching the bitrate....

Reply #4 –
Hi

I know there's a win32 version around but the link I get is 404. Can anyone tell me where can I download it? (or pm me to mail it to me)

Thanks in advance!