Time code track reading

[Dave1024]

Hi,

I had a .mov file which have 1 video track 1 audio track 1 timecode track.
I need to extract the data from .mov container.
I follow https://developer.apple.com/standards/qtff-2001.pdf for understand the structure of .mov.

I face a problem when i try to decode the timecode track.

I am able to read the sample description atom's with following details

stsd atom

Sample Description Size :: 58
Data format :: 'tmcd'
Data Reference Index :: 1
Time code flag :: 0
Time Scale :: 30
Frame Duration :: 1
Number of Frames :: 20

stts atom

sample count : 1
sample duration :1

stsc atom

number of entries :1
first chunk : 1
samples per chunk : 1
sample description : 1

stsz atom

sample size :4
number of entries :1

stco atom

number of entries :: 1
offset :: 64

By moving the offset 64 bytes from the start of the file i got the data 00 01 a5 74.
By the timecode media definition hh = 00, negative flag = 0, minute = 01 second = 165, frame = 116.

This is the point i don't understand, the second and frame value is wrongly interpreted.
kindly help me to correct my data extraction

Is there any tool available to detect the timecode in timecode track ?

Thanks
Dave.

[Baldrick]

Please don't cross post. Continue in https://forum.videohelp.com/threads/346093-Mov-TimeCode-Track-Info?p=2161796#post2161796