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PVR - Differing File Size

Discussion in 'Other video questions' started by send2gl, Oct 30, 2013.

  1. send2gl

    send2gl Member

    Nov 28, 2010
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    I have a video recorder with TV tuner, recorded programs can be exported to USB or via network to a .ts file which I understand is mpeg2

    I recorded two different programs recently; noticing a big difference in file size I used ffmpeg to compare and noticed the following main difference;

    Video stream video 1 15000 kb/s
    Video stream video 2 2794 kb/s

    Each video was by a different broadcaster (one UK BBC and one UK ITV) but recorded on the same device so I am a wee bit puzzled; I thought it was the format recorded in that set the file size, it looks like I am wrong if someone could clarify for me please.

    Last edited: Oct 30, 2013
  2. attar

    attar Senior member

    Jun 17, 2005
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    The bitrate allocated to the channel (multiplied by the running time) sets the file size.
    Not being in the UK, I can't say for sure, but North American stations may have more than one channel multiplexed in the same signal thus the available bitrate may be being divided more to channel-1 than channel-2.

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