• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Devaka Cooray
  • Knute Snortum
  • Paul Clapham
  • Tim Cooke
Sheriffs:
  • Liutauras Vilda
  • Jeanne Boyarsky
  • Bear Bibeault
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Ron McLeod
  • Piet Souris
  • Frits Walraven
Bartenders:
  • Ganesh Patekar
  • Tim Holloway
  • salvin francis

A question about codec in JMF  RSS feed

 
Ranch Hand
Posts: 159
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Dear All I had a question about codec
I check about codec
it said ulaw is a kind of codec(compression rate is 50%)
but i am more confused after seeing some implemation code
one example is encoding captured audio data
it will encode captured audio data in the IMA4 format(codec) before saving it into
a file(*.wav)
so i guess if you didnot explicit set output media file's codec format
before saveing data into output media file, then this file will have
no codec format (not compressed), you will store raw data into media file.
Is it correct?
another example is sending out a file
sending out a media file( which is *.avi file)
firstly setup RTP configuration and create configuration for flows(setting up codec)

SenderCofig[]flows={ new SenderConfig(config1, new AudioFormat(AudioFormat.ULAW_RTP)),//setting up codec
new SenderConfig(config2, new VideoFormat(VideoFormat.JPEG_RTP)) //setting up codec
};
then you send out
But media file, which is sent, is *.avi file
if this *.avi flie had its' own codec format already
during sending , if you setting up codec again (in this case AudioFormat.ULAW_RTP)
will this coverting cause problem?
I want to know if each media file (eg *.avi, *.au, *.jpeg)has it's own codec? ,doest those media files
support storing in raw data format?
I mean could we store raw data(without codecing them) into media file(*.avi,*.au, *.jpeg)?
or when we store data into mediafile, we must codec (compress)them before saving them into media files?
 
Why does your bag say "bombs"? The reason I ask is that my bag says "tiny ads" and it has stuff like this:
how do I do my own kindle-like thing - without amazon
https://coderanch.com/t/711421/engineering/kindle-amazon
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!