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Parse ffprobe keyframe output
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''' | |
# Parse ffprobe keyframe output | |
Run with | |
ffprobe -loglevel error -show_entries packet=pts_time,flags -of csv=print_section=0 -i <input file or stream> | python kf.py | |
See https://stackoverflow.com/a/18088156 | |
''' | |
import sys | |
def delta_ms(timestamps): | |
it = iter(timestamps) | |
previous = next(it) | |
for timestamp in it: | |
yield int(1000 * (timestamp - previous)) # milliseconds | |
previous = timestamp | |
def parse_keyframes(lines): | |
for line in (raw.strip() for raw in lines): | |
if len(line) == 0: | |
continue | |
#print(f"line ({len(line)}): {line}") | |
ts, flags = line.split(',') | |
if 'K' in flags: | |
# confirmed it's a keyframe | |
yield float(ts) # seconds | |
def main(): | |
for delta in delta_ms(parse_keyframes(sys.stdin)): | |
print(f"{delta} ms") | |
if __name__ == '__main__': | |
main() |
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