[Mp4-tech] Dropping NAL units on bit errors: Best approach?

[Luqman]

> Gary Sullivan wanted us to know:

>Yes, it's a byte-alignment recovery trick.  As John points out, extra
>zero-valued bytes can be present between any pair of NAL units, but at
>least one such byte is required for the most important NAL units to
>enable decoder alignment recovery.  Alignment recovery is important in
>some scenarios but not others, but the quantity of data necessary to
>enable it is so low (about 1-2 bytes per picture) that we decided to
>require it to be there all the time.

Thanks Gary for clarifying this. But there is some confusion where the
leading zero byte 0x00 before 3 byte start_code_prefix belongs to.
Example: 
0x00000001................0x00000001.................0x00 0x00000001 
The extra 0x00 preceeding third 0x00000001 belongs to the second NALU
whereas 0x00000001 belongs to the third NALU.
Similarly in case of second appearance of 0x00000001, these 4 bytes
belong to second NALU.
Am I correct? Or is it only ture in case of SPS, PPS and first NALU of
an access unit / frame / picture?
Regards,
Luqman 
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