Changes between Version 2 and Version 3 of audio types

Timestamp:

Jun 10, 2015, 8:43:24 PM (11 years ago)

Author:

Roger Pack

Comment:

wow that is confusing...

audio types

@@ -3 +3 @@
 for instance:
 
-* pcm_s16le PCM means "traditional wave like format" (raw bytes, basically).  16 means 16 bits per sample, le means "little endian", s means "signed"
-* pcm_s32le same but 32 bits per sample.
+* pcm_s16le PCM means "traditional wave like format" (raw bytes, basically).  16 means 16 bits per sample, "le" means "little endian", s means "signed", u would mean "unsigned"
 
-You can see a list, like:
+You can see a list, by running a command like this on your own local box:
 
 {{{
@@ -33 +32 @@
 }}}
 
-Basically these represent raw audio types.
+Basically these represent all the raw audio type combination possibilities. 
 
-Other types include
+FFmpeg can take input of raw audio types by specifying the type on the command line.  For instance, to convert a "raw" audio type to a ".wav" file:
 
-* pcm_bluray, which can be at least 24 bit, possibly other bit rates.
+{{{ ffmpeg -f pcm_s32le input_filename.raw output.wav }}}
 
-The default for .wav files is to use pcm_s16le, you can change it like:
+You can specify number of channels, etc. as well, ex:
 
-{{{ ffmpeg -i input -acodec pcm_s32le yo.wav }}} 
+{{{ ffmpeg -f u16le -ar 44100 -ac 1 -i input.raw output.wav }}}
 
-and thus store other types of wave formats in there.
+The default for encoding .wav files it uses is pcm_s16le, you can change it by specifying an "acodec" and using the .wav file extension:
+
+{{{ ffmpeg -i input -acodec pcm_s32le yo.wav }}}
+
+Which will create a .wav file containing audio with that codec (not a raw file) (there are also other containers that can contain raw audio packets, like pcm_bluray).  If you want to create a raw file, don't use the ".wav" ending:
+
+{{{ ffmpeg -i input -acodec pcm_s32le yo.raw }}}