def read_trun(data, offset): # simplified: read version, flags, sample_count version = data[offset] flags = struct.unpack(">I", data[offset:offset+4])[0] & 0xFFFFFF sample_count = struct.unpack(">I", data[offset+4:offset+8])[0] offset += 8 samples = [] for i in range(sample_count): sample_duration = struct.unpack(">I", data[offset:offset+4])[0] offset += 4 # ... read size, flags, cts_offset if present return samples, offset
If you have an .m4s file on your computer (likely downloaded from a website cache) and you want to view it, you cannot simply double-click it. open .m4s file