stream_type(1)

STREAM_TYPE(1) General Commands Manual STREAM_TYPE(1)

NAME

stream-type — Guess the type of a stream file

SYNOPSIS

stream-type [-err stdout] [-err stderr] [-verbose | -v] [-quiet | -q] in_file

DESCRIPTION

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

Files

in_file

is the file to analyse

Switches

-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

RETURN VALUES

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

SEE ALSO

esdots(1), GNU October 28, 2015 STREAM_TYPE(1)