stream-type —
Guess the type of a stream file
stream-type |
[-err stdout] [-err
stderr] [-verbose |
-v] [-quiet |
-q] in_file |
Attempt to determine if an input stream is Transport Stream,
Program Stream, or Elementary Stream, and if the latter, if it is H.262 or
H.264 (i.e., MPEG-2 or MPEG-4/AVC respectively). The mechanisms used are
fairly crude, assuming that:
- data is byte aligned
- for TS, the first byte in the file will be the start of a NAL unit, and
PAT/PMT packets will be findable
- for PS, the first packet starts immediately at the start of the file, and
is a pack header
- if the first 1000 packets could be H.262 *or* H.264, then the data is
assumed to be H.264 (the program doesn't try to determine sensible
sequences of H.262/H.264 packets, so this is a reasonable way of
guessing)
It is quite possible that data which is not relevant will be misidentified
- in_file
- is the file to analyse
-err
stdout- Write error messages to standard output (the default)
-err
stderr- Write error messages to standard error (Unix traditional)
-v,
-verbose- Output more detailed information about how it is making its decision
-q,
-quiet- Only output error messages
The program exit value is:
- 10
- if it detects Transport Stream,
- 11
- if it detects Program Stream,
- 12
- if it detects Elementary Stream containing H.262 (MPEG-2),
- 14
- if it detects Elementary Stream containing H.264 (MPEG-4/AVC),
- 5
- if it looks like it might be PES,
- 9
- if it really cannot decide, or
- 0
- if some error occurred