Apple Video Foundation (AVF) and .mpg files

Richard Gaskin ambassador at
Tue Mar 26 17:38:40 EDT 2019

Paul Dupuis wrote:

 > My specific interest is: Is there a way to tell a MPEG-1 file from an
 > MPEG-2 file with the same .mpg extension?
 > For example, does someone know a technique or have code to read the
 > first X bytes of the file and determine encoding from that OR use some
 > shell wizardry to tell the encoding?

IIRC both MPEG-1 and MPEG-2, and their variants (streaming vs 
non-streaming, etc.) use the same magic number. :(

Depending on which components may be installed in each target platform, 
a shell call may be the better bet.

If lower-level APIs are needed there's always LC Builder.

  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
  Ambassador at      

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