ASDCPLib fails if the size of a BER Length is less than 4-bytes

[palemieux]

The following claims that BER Lengths must be 4 bytes or longer, but I cannot find any such evidence in the IMF or DCP specifications.

asdcplib/src/h__Reader.cpp

Line 211 in 69e1a22

if ( ber_size < MXF_BER_LENGTH )

ST 377-1 recommends that MXF encoders should use 4-byte BER long-form encoding for the Length of all Header Metadata Sets, but does not impose a requirement on shorter lengths.

Recommend:

• at the very least clarify the comment in the code to state this is an ASCDPLib limitation, not a spec limitation
• consider removing this limitation
• consider amending the appropriate IMF and DCP standards to note that BER lengths that are 3-bytes or less might cause compatibility issues