保存したtsファイルでなく、recpt1から直接Transport Streamをいじる

gistfile1.py

#/usr/bin/env python
# coding: utf-8

from subprocess import Popen, PIPE
import array
import itertools
import shlex

def stream(ch):
    a = Popen(shlex.split("recpt1 {:d} - -".format(ch)), stdout=PIPE)

    packet = array.array('B')
    for bytes in iter(a.stdout.readline, ""):
        for byte in bytes:
            if byte == 0x47:
                if len(packet) == 188:
                    yield packet
                packet = array.array('B')
            packet.append(byte)

# 151: BS-asahi
for packet in stream(151):
    do_something(packet)