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Vertical Interval Time code decoding from VBI lines

Audio Dave
Intellectual 280 points


Hi,

I would like to post process the output video after decoding a stream of mpeg-2 with

Resolution :: 720x608

4:2:2 @ML and VBI lines present at top.

I want to decode the VITC information present in the VBI lines.I am using a beegle board for doing the post processing and utilize the SIMD processing power.

  i am struggling with following area's. I need a help for the same.

[I read SMPTE 12M std for know the concepts]

The doubts shared here

1. For an interlaced stream which line/lines consist the VITC information.

2. Suppose my VITC data is in line 10, from the start bit onwards the line consist the VITC information or need a search for synch bits.

3. The 90 bit VITC have many synch words present. In this which one wants to search for a start of the VITC info bit sequence.

 

Thanks

Dave

 

 

  • 0
    TI__Expert 6120 points

    Hello Dave,

    Please specify which TI device you're using so that I can forward your question to the proper forum.

    Regards,

    Jim

  • 0 in reply to James Nave
    Intellectual 280 points

    Hello James,

    Well, your direction is proper.

    I have one OMAP3 based beegle board. I used this hardware to decode my stream. After decoding the uncompressed data is written to the file with an extension like .yuv and frame size is exactly matching with resolution of input video. I want to write the VITC time code + Resolution and Native Codec info as a header before start to write the yuv data of first frame.

    To complete my experiment i would like to clarify the points relate to VITC.

     

    Thanks

    Dave