Last active
November 24, 2023 09:41
-
-
Save mat127/40537494a67dbe5b23260afd83a3eb7d to your computer and use it in GitHub Desktop.
Timestamp SEI (MISB ST 604) parser
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/awk -f | |
# | |
# Parses the ffmpeg trace_headers output and displays timestamp SEI (MISB ST 0604) | |
# contents in a readable format: | |
# | |
# ${ts.identifier}: ${datetime.of.timestamp}: ${timestamp.value} | |
# cf848278-ee23-306c-9265-e8fef22fb8b8: Fri Nov 24 09:40:48 UTC 2023 : 1700818848602427904 | |
# | |
# Expects the H.265 SEI i.e. nano precision timestamps. For the H.264 (microseconds precision) | |
# update the timestamp dividing and identifier dump. | |
# | |
# Example: | |
# | |
# ffmpeg -i udp://127.0.0.1:5050 -c:v copy -bsf:v trace_headers -f null - 2>&1 | ./sei.awk | |
# | |
function timestamp_to_date(timestamp) { | |
command = "date -d @" timestamp; | |
command | getline date_string; | |
close(command); | |
return date_string; | |
} | |
BEGIN { | |
user_data_line = 64 | |
} | |
user_data_line < 64 { | |
user_data_line++ | |
} | |
$4 == "User" && $5 == "Data" && $6 == "Unregistered" { | |
user_data_line = 0 | |
identifier = "" | |
timestamp = "0x" | |
} | |
user_data_line > 0 && user_data_line < 17 { | |
char = sprintf("%02x", $8) | |
identifier = identifier char | |
if (user_data_line == 4 || user_data_line == 6 || user_data_line == 8 || user_data_line == 10) { | |
identifier = identifier "-" | |
} | |
} | |
user_data_line > 17 && user_data_line < 29 && user_data_line != 20 && user_data_line != 23 && user_data_line != 26 { | |
char = sprintf("%02x", $8) | |
timestamp = timestamp char | |
} | |
user_data_line == 28 { | |
timestamp = strtonum(timestamp) | |
ts = int(timestamp / 1000000000) | |
print identifier ": " timestamp_to_date(ts) " : " timestamp | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment