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Forums Broadcasting IMX format, please help!

  • IMX format, please help!

     Asmund Voll Tesdal updated 11 years ago 3 Members · 5 Posts
  • Paul Dombrovskis

    August 22, 2009 at 7:52 am

    Hi guys,

    am new to IMX format and to your site aswell. I will have to work with IMX and i need to know how big would be a 10 second file recorded in IMX30+ 8 audio.

    thnaks in advance
    cheers
    Paul

  • Bob Zelin

    August 23, 2009 at 2:31 pm

    MPEG IMX is a 2001 development of the Digital Betacam format. It uses the MPEG compression system, but at a higher bitrate than Betacam SX. The IMX format allows for a CCIR 601 compliant video signal, with eight channels of audio and timecode track. It lacks an analog audio (cue) track as the Digital Betacam, but will read it as channel 7 if used for playback.

    Compression is applied in three different formats: 30 (6:1 compression), 40 (4:1 compression) or 50 Mbit/s (3.3:1 compression) which allows different quality/storage efficiency ratios. Video is recorded as MPEG-2 I frames only.

  • Paul Dombrovskis

    August 23, 2009 at 2:38 pm

    thank you for that!

    what would be the size of 10 sec IMX-30 8 audio format clip??

    cheers!

  • Bob Zelin

    August 23, 2009 at 9:46 pm

    I have no idea.

    Bob Zelin

  • Asmund Voll Tesdal

    August 26, 2009 at 7:19 pm

    Well, IMX30 has a bitrate of 30 mb/s (megabits), so a 10 sec clip should be 37.5 mB (megabytes) of video. Don’t remember the audio format for IMX, but I’ll guess 16 bit 48k, which in 8 channels for 10 secs should be 7.68 mB. Then add some metadata on top of that, and you should have an approximate size.

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