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.MTS encode to .MPG Quality Loss

Apr 23, 2013 2:15 PM

Tags: #mts #avchd #export #mpg2

Hi, I have a Panasonic ADVHD camera that records .MTS files.  I edit the videos in Premiere Pro and I export them as a .mpg (mpeg2).  I've noticed that I lose a lot of quality of the file when I export.  I am using Windows 7 quad core 4gb of ram.  Is there any way to avoid this major quality loss? I've been reading forums and I haven't been able to find anyone else having this problem. Thanks.

 
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  • joe bloe premiere
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    Apr 23, 2013 2:20 PM   in reply to dangerbracht

    What is your intended final delivery:

    DVD?

    Blu-ray?

    YouTube?

    Broadcast?

    Other?

     
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  • joe bloe premiere
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    Apr 23, 2013 2:28 PM   in reply to dangerbracht

    Are you encoding SD files?

     
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  • joe bloe premiere
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    Apr 23, 2013 2:41 PM   in reply to dangerbracht
    mpeg 2 file max 8mb/s playback.

    That's an awfully low bitrate for an HD file...

    I'm not surprised you are disappointed with the quality.

     

    This is an MPEG2 1080 encoding preset for

    the broadcast digital distribution network "Extreme Reach"

    CBR / 45Mbps.

    ER1080.PNG

    I am using a Leightronix UltraNEXUS

    No idea what that is...

    but if you are limited to 8Mbps, then it is what it is.

     
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  • joe bloe premiere
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    Apr 23, 2013 2:51 PM   in reply to dangerbracht

    Still kinda low for SD...

    This is an MPEG2 SD encoding preset for

    the broadcast digital distribution network "Extreme Reach"

    CBR / 18Mbps

    ER_SD.PNG

     
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  • joe bloe premiere
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    Apr 23, 2013 3:03 PM   in reply to dangerbracht

    That is a preset I created according to Extreme Reach specs.

    It will not be pre-installed in your Encoder presets.

    You can look and re-create + save for yourself.

    But... if you are in fact limited to 8Mbps, it will not work.

     

    I also deliver SD MPEG2 files to DG Systems...

    another broadcast delivery network.

    Here are those settings... much higher bitrate even than

    the Extreme Reach setup (this setup is 'grandfathered in'

    from years ago and might get rejected if you try).

    VBR, 2-Pass / almost maxed out:

    DG_SD.PNG

     
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  • joe bloe premiere
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    Apr 23, 2013 3:18 PM   in reply to dangerbracht

    I'm still getting lost... I don't have that preset either,

    Again...

    Those are presets I created according to Extreme Reach / DG specs.

    They will not be pre-installed in your Encoder presets.

    You can look at them and re-create + save for yourself.

    But... if you are in fact limited to 8Mbps, they will not work.

    I did some research and read that .MTS files are already highly compressed and may not be able to be converted to .mpg without quality loss.  What are your thoughts on that?

    Encoding to anything aside from a lossless codec (MPEG2 is not

    in the lossless category) will result in varying degrees of quality loss.

     
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  • joe bloe premiere
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    Apr 24, 2013 7:45 AM   in reply to dangerbracht

    I downloaded a sample 1080 Panasonic .MTS media file here.

    (filename: Panasonic_AG_HMC_151.MTS)

     

    Here are my Export Settings (CBR / 8Mbps):

    Export_Settings.PNG

     

    Here is the exported SD MPEG2 file:

    SD_Export.PNG

     
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  • Currently Being Moderated
    Apr 24, 2013 9:48 AM   in reply to joe bloe premiere

    Sorry, but I don't understand why you are using these export settings.

     

    Your source material is AVCHD 1920 x 1080 @ 25 fps interlaced. Why would you export that to NTSC (Never Twice the Same Color) with only 720 x 480 resolution, the reduced 16 - 235 RGB levels but keep the PAL framerate of 25?

     

    Why not export to PAL with 720 x 576 with the full 0 - 255 RGB levels and the same framerate?

     
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  • joe bloe premiere
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    Apr 24, 2013 11:32 AM   in reply to Harm Millaard

    Harm... you're right.  I should clarify.

    That setup is only addressing the OP's concern regarding a

    quality loss he is experiencing when encoding MPEG2 SD files

    specifically from 1080 .MTS source material.

     

    I live in NTSC land, not PAL.

    I am not sending this MPEG file anywhere,

    nor am I suggesting he use this exact Encoder Setting.

    I'm only illustrating that an 8Mbps SD MPEG file from a 1080 .MTS

    does not have to look as the OP describes:

    "...people look like blobs walking around.  No detail at all."

    "...it's just this format that gives me all the quality loss."

     

     

    I don't know if the OP is PAL or NTSC, either.

    But, the specs for his 'box' say NTSC...

     

    Posts #8 and #10 are actual deliverable NTSC MPEG2 settings

    that I employ on a regular basis.

     
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  • joe bloe premiere
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    Apr 26, 2013 12:02 PM   in reply to dangerbracht

    First off.. your files are HDV anamorphic, not HD:

    1440x1080 (1.3333)

    _file.PNG

     

     

    You need to be sure your sequence settings match your media:

    1440x1080 (1.3333)

    _sequence.PNG

     

     

    With your media file, using proper (matching) sequence settings,

    I exported from Premiere using these default settings:

    _export.PNG

     

     

    Comparison of my encoded .mpg file (middle), with yours (edges):

    _compare.PNG

     

     

    How to easily create a sequence that matches your media:

    DragAndDropCS6.png

     

    Also... what is that thing?

    Is it a bell tower clock?

     
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