Hello - I need some help understanding something. I’m looking at two WEB-DL files from reputable groups that are identical in nearly all ways (see details below), except one file is noticeably larger than the other (2.8GB vs 3.47GB, for example). I thought WEB-DL’s should be the same size if they’re from the same source (AMZN in this instance), so I’m a little confused as to why there’s such a disparity in size when all else appears equal.

Any idea’s what could explain the difference in file size here? I’m assuming the FLUX file is older based on when it was first uploaded vs the NTb one. Could this have something to do with it?

Bonus question: Which file would you choose in this situation?

(1) 1080p.AMZN.WEB-DL.DDP2.0.H.264-NTb

  • FileSize…: 2.80 GiB
  • Duration…: 42 min 35 s
  • Video…: High@L4 | 1920x1080 @ 9 197 kb/s
  • Audio…: English Dolby Digital Plus | 2 CH @ 224 kb/s
  • Subtitle…: English / English.

(2) 1080p.AMZN.WEB-DL.DDP.2.0.H.264-FLUX

  • FileSize…: 3.47 GiB
  • Duration…: 42 min 12 s
  • Video…: High@L4 | 1920x1080 @ 11.3 Mb/s
  • Audio…: English Dolby Digital Plus | 2 CH @ 224 kb/s
  • Subtitle…: English.

Edit: Thanks for all the replies! For anyone who stumbles upon this later on with a similar question, there’s some really great replies in the comments below worth checking out. In my case, the file size difference was due to the difference in bitrate, where the bitrate differential is likely due to either (A) the region where the AMZN WEB-DL occurred (with different regions having different bitrates), or (B) the release group modifying the bitrate to fit a specific need (like limiting the file size). Knowing both release groups here tend to prioritize quality, I’m guessing the region is likely the main driver in the difference in bitrate size.

  • godless@latte.isnot.coffee
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    1 year ago

    The date of the upload doesn’t matter. What matters is the bitrate given.

    9 197 kb/s vs. 11.3 Mb/s means that the FLUX release is packing >20% more image data into the file, so the picture will look crisper, contains more visual information, and is less compressed in general.

    Depending on your display you might not actually notice the difference, but on a good, large HD panel you will be able to spot differences here and there, particularly when it comes to fast change of scenes, swift light/dark changes, and rapid movements.

    • blixo@lemmy.fmhy.mlOP
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      1 year ago

      That makes sense and helps to conceptualize the impact of the bitrate difference. I guess I was under the impression that bitrate would be set at the source and not by the release group, but seems I may have been wrong in that assumption. Thanks for the info!

      • godless@latte.isnot.coffee
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        1 year ago

        The source defines the bitrate at which it is streaming, which sets the theoretical maximum. The release group then decides if and how much they want to compress the file.

        Theoretical maximum because the release group could go above spec, but that wouldn’t add any benefits.

        • mammut@lemmy.world
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          1 year ago

          Unless the meaning of the term has changed, WEB-DL are not re-encoded by the group. WEB-DL is meant to indicate a “lossless” copy of the stream. (Obviously not literally lossless, since no video streaming service is streaming lossless, but lossless relative to the original stream).

  • chftyrol@feddit.it
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    1 year ago

    Hi, the difference in size you are seeing is because of the different video bitrates. The Ntb one has a slightly lower bitrate, so for videos that are about the same duration, this translates to a lighter file.

    Whether or not you could perceive the difference amounts to your sensibility and experience with this kind of things as well as to your monitor.

    • blixo@lemmy.fmhy.mlOP
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      1 year ago

      Gotcha. Any idea why the bitrate would be different on a WEB-DL from the same source? I figured bitrate would remain the same if the file is being downloaded and DRM stripped, with all else (source, resolution, etc…) remaining equal.

  • webjukebox@mujico.org
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    1 year ago

    (1) 1080p.AMZN.WEB-DL.DDP2.0.H.264-NTb

    FileSize…: 2.80 GiB Video…: High@L4 | 1920x1080 @ 9 197 kb/s

    (2) 1080p.AMZN.WEB-DL.DDP.2.0.H.264-FLUX

    FileSize…: 3.47 GiB Video…: High@L4 | 1920x1080 @ 11.3 Mb/s

    Bitrate, every group use different encode.

    • blixo@lemmy.fmhy.mlOP
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      1 year ago

      Ohh, I didn’t realize the release groups would set the bitrate. I figured that was set at the source. But that makes sense. Thanks for helping to clear this up! I was at a loss trying to connect the dots on the size differential here.

      • webjukebox@mujico.org
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        1 year ago

        Different groups specialize in different target audiences. Some seek the highest quality, others want not to exceed a certain number of gigabytes, etc.

    • blixo@lemmy.fmhy.mlOP
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      1 year ago

      Thanks for the reply and the link! I agree, based on everything I’m learning in this thread, seems like the FLUX version is the way to go for the added bitrate.

  • frank@lemmy.world
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    1 year ago

    My guess is the source file is the same sorce file, but some groups process the file to cut down the file size.

    • Monomate@lemm.ee
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      1 year ago

      If there’s some re-encoding, would the file still be considerd “WEB-DL” at this point?

        • Monomate@lemm.ee
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          1 year ago

          “Rip” implies re-enconding. Web-DL is the exact video stream as it is transmited, without any further re-encondings by the release group. Unless I’m wrong…?

    • blixo@lemmy.fmhy.mlOP
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      1 year ago

      Process, meaning like encode? Or can it be processed in other ways that doesn’t alter the quality?

      I noticed that the smaller file is longer, interestingly enough. So there does appear to be some level of trimming I’m assuming, but I wouldn’t have expected the longer file to be the smaller one.

        • blixo@lemmy.fmhy.mlOP
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          1 year ago

          Hi - just curious if you were able to look at the release notes for these releases (the NTb and FLUX ones) and whether or not you found out anything. If not, no worries, but I thought I’d check in.

          Also, I’m particularly interested because I noticed that the FLUX version has a season REPACK out there where the REPACK size is similar to the NTb file size, which makes me all the more curious about the original FLUX versions with the increased file size / bitrate (and whether that means better quality or not in this instance).