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  • Compression Techniques

    5.1 routing in quicktime

    Posted by Andrea Hofmann on October 27, 2015 at 2:13 pm

    Hi,

    I have been doing some tests regarding export of quicktime/mp4 container – with different video codecs (H264/Prores) and 5.1 routing (PCM/AAC).

    As far as I know these 5.1 routing standards exists:
    LRCLFELsRs – DCI
    LCRLFELsRs – Film

    and in one or the other programm (I have tested Clipster, Compressor, MediaEncodeer etc), I found this type of routing CLRLsRsLFE especially attached to AAC. (and in Compressor also LRLsRsCLFE)

    Has anyone more infos on these types of 5.1 routing attached to certain codecs/containers and types of players?
    And who is responsible for the routing (metadata) in Quicktime (Quicktime itself, the type of codec I use or the programme I use) I am looking for more infos on this topic.

    Also is it possible to mulitplex AC3 with video into one file (not via a videoplayer)? Or is it purely for DVD/BluRay authoring?

    Thanks 🙂
    Andrea

    Andrea Hofmann replied 10 years, 5 months ago 3 Members · 4 Replies
  • 4 Replies

  • Craig Seeman

    October 27, 2015 at 8:03 pm

    You route the audio the way you need for delivery.

    Telestream Episode has a Channel Mapper if you need.

  • Andrea Hofmann

    October 28, 2015 at 6:54 am

    Hi, thank you, but the thing I would like to know is, which type of routing shall I use for specific scenarios?
    DCI = DCP
    film = general use for filebased

    but what about those other types of routing and where are their origins?
    thank you 🙂

  • Mark Spano

    December 8, 2015 at 4:12 pm

    It’s simple really.

    ALWAYS order surround channels this way:

    1 – Left
    2 – Right
    3 – Center
    4 – LFE
    5 – Left Surround
    6 – Right Surround

    This is SMPTE specification for surround channel layout. Any other layout for surround channels is asking for trouble for the next person. Anyone working in production or post or projection is expecting this order, and when the channels aren’t in this order, it’s a guessing game. Any other “established” ordering was made before the SMPTE spec, and the SMPTE spec aimed at eliminating confusion.

  • Andrea Hofmann

    December 8, 2015 at 4:33 pm

    Hi,

    thank you, yes I came to this conclusion too after excessive testing 😉
    Though it seems the routing type CLRLsRsLFE is really an AAC thingy and a combination of the player.
    Yes best ist to stick with SMPTE routing.
    Thank you

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