The While statement fails the compare when using Bytes It seems it only takes int

I want to compare bytes in a video file.ser that has 8 bit data. I need to find the first non zero byte at the beginning of the frame. I use red = mm.read(1) to receive a byte direct from the file on disk because the files are huge. I seems that While and if compare int data and fail to deliver the correct comparison when attempting to compare int(0) == b´\00 and Byte(0)==b´\00

"If" displayed the same effect and my attempt to redefine the variables as int have exceeded my knowledge.

mm = mmap.mmap(f.fileno(),0) #0=read the whole file
red = 0 #This value is int
print ("Red ",red) #Confirm int

while  red == 0:      # This works First time

    red = mm.read(1) # Now red is Byte 
    print ("Red = ",red, "Position  ", mm.tell(),"\r" ) #red is b´\x00

else:
    print ("Red = ",red, "Position exit ", mm.tell() ) # exit because red is Byte

The first compare can only be True if both halves of the comparison are int. All other cases exit the while after one loop