"tfhd" flags interpretation about mp4parser HOT 6 CLOSED

The value is calculated and not actually read! Please always keep in mind that 
the parser interprets the boxes. It may show things that are actually not in 
the file.

sorry - I misunderstood your comment. 

The default value is 0. But there is no value! 0 is just the default. I just 
changed it to -1 to make clear that there is no value

Hi Sebastian, thanks for looking into this.

I am not sure that I fully understand what you mean by "there is no value". The 
flags are 11, both baseDataOffset and defaultSampleSize are present.  I am 
using isoviewer-1.1-SNAPSHOT.jar to look at the file now and it looks fine. In 
other words isoviewer-1.1-SNAPSHOT.jar works pretty much as expected. It seems 
it displays all fields regardless of the flags.  

The Object has a field 'defaultSampleSize'. The type of the field is 'long'. I 
cannot make the value disappear. The field always contains a value and by 
default '0'. I could switch to 'Long' to have the possibility to put a 'null' 
into the field but I think it's ok to have a '-1' to represent 'no value 
available'.

Sebastian, I think there is some misunderstanding or miscommunication here.
What I meant is the following:
When the flags are 11, the following should be present:
 1. baseDataOffset 
 2. defaultSampleSize
The other fields such as defaultSampleDuration should not be present.

The original version of isoviewer does NOT show baseDataOffset, 
defaultSampleSize, but shows defaultSampleDuration. I thought this is incorrect.

isoviewer-1.1-SNAPSHOT.jar shows baseDataOffset, defaultSampleSize correclty, 
and shows 0 for other fields such as defaultSampleDuration.  I think this is 
not desirable, but it is OK if someone knows that 0 may mean the field is not 
present.

I'm not going to change anything here but will accept patches.