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Activity Forums Adobe Media Encoder Shouldn’t file size reduce?

  • Shouldn’t file size reduce?

    Posted by Andy Tubbesing on August 3, 2020 at 2:37 pm

    I bring an AE file into Media Encoder, with Export set to “Match Source – High bitrate.” The Estimated File Size is 85 MB. If I then lower Width and Height settings to half size (2560×1440 down to 1280×720), the Estimated File Size stays the same. Shouldn’t it reduce to about 25% of the original size, down to about 20 MB?

    Here’s the QT Inspector info on both movies:

    test hi.mp4
    Source:
    /Volumes/1 work/test hi.mp4
    Format:
    H.264 HD (1-1-1)
    Stereo (L R), AAC, 48000 Hz
    Resolution:
    2560 x 1440, 16:9
    Encoded FPS:
    29.97
    Data Size:
    99.4 MB
    Data Rate:
    11.30 Mbit/s
    Current Size:
    1811 x 1019 (Scaled 0.71x)

    test lo.mp4
    Source:
    /Volumes/1 work/test lo.mp4
    Format:
    H.264 HD (1-1-1)
    Stereo (L R), AAC, 48000 Hz
    Resolution:
    1280 x 720, 16:9
    Encoded FPS:
    29.97
    Data Size:
    99.3 MB
    Data Rate:
    11.30 Mbit/s
    Current Size:
    906 x 510 (Scaled 0.71x)

    Thanks.

    Andy Ford replied 3 years, 8 months ago 2 Members · 1 Reply
  • 1 Reply
  • Andy Ford

    September 24, 2020 at 2:59 am

    Your file size will not reduce because your data (bit) rate is the same. Bitrate affects file size the most. Frame rate can affect file size. Frame size or resolution does not really affect file size, but can provide better quality. For example, you have less pixels to compress in a smaller frame size, so it would have better quality at an equal bitrate to a larger frame size.

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