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Mini Shell
Mini Shell
#! /usr/bin/env python
import mp4utils
import sys
import os.path as path
SCRIPT_PATH = path.abspath(path.dirname(__file__))
sys.path += [SCRIPT_PATH]
platform = sys.platform
if platform.startswith('linux'):
platform = 'linux-x86'
elif platform.startswith('darwin'):
platform = 'macosx'
class Options(object): pass
options = Options()
options.debug = False
options.verbose = False
options.min_buffer_time = 0.0
options.exec_dir = path.join(SCRIPT_PATH, 'bin', platform)
class Sidx(object): pass
mp4_file = mp4utils.Mp4File(options, mp4utils.MediaSource(sys.argv[1]))
moof_offsets = []
sidx_anchors = []
for atom in mp4_file.atoms:
if atom.type == 'moof':
moof_offsets.append(atom.position)
elif atom.type == 'sidx':
sidx_anchors.append(atom.position+atom.size)
print 'sidx anchors:', sidx_anchors
print len(moof_offsets), 'moof boxes found:', moof_offsets
sidx = None
sidx_index = 0
for atom in mp4_file.tree:
if atom['name'] == 'sidx':
sidx = Sidx()
sidx.entries = []
sidx.reference_id = int(atom['reference_ID'])
sidx.timescale = int(atom['timescale'])
sidx.earliest_presentation_time = int(atom['earliest_presentation_time'])
sidx.first_offset = int(atom['first_offset'])
for (name, value) in atom.items():
if name.startswith('entry '):
entry = {}
for field in value.split(', '):
(field_name, field_value) = field.split('=')
entry[field_name] = int(field_value)
sidx.entries.append(entry)
count = 0
offset = sidx.first_offset
for entry in sidx.entries:
#print entry
if entry['reference_type'] == 0:
#print sidx_anchors[sidx_index]+offset
if sidx_anchors[sidx_index]+offset not in moof_offsets:
print 'sidx offset', sidx_anchors[sidx_index], '+', offset, 'does not point to a moof box'
offset += entry['referenced_size']
sidx_index += 1
print 'sidx OK'
elif atom['name'] == 'mfra':
for child in atom['children']:
if child['name'] == 'tfra':
for (name, value) in child.items():
if name.startswith('entry'):
entry = {}
for field in value.split(', '):
(field_name, field_value) = field.split('=')
entry[field_name] = int(field_value)
if entry['moof_offset'] not in moof_offsets:
print 'tfra offset', moof_offset, 'does not point to a moof box'
print 'mfra OK'
print '=== Done ==='
Zerion Mini Shell 1.0