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Problem Export AVCHD 4:2:0 to MP4 with less artifacts?

Discussion in 'Convert video to another format' started by AplAy, Mar 23, 2015.

  1. AplAy

    AplAy Member

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    Hi!

    I have a Legria HF G25 PAL camcorder (which seems very crappy to me or I am just too noob to handle it good enough yet) and I record in highest quality (24Mbit/s) and I export to MP4 through a preset called "YouTube 1080p 25fps" in Adobe Premiere Pro CC 2014.

    When I upload it to YouTube, I get lots of blurry and strange artifacts and not as a sharp image as I would like (see example below of I video I shoot; I used manual exposure so I understand the sky got noisy when light outside was lower. There is also dirt on the window I recorded through to capture a timelapse of a solar eclipse):



    I have asked this on another forum and someone mentioned GOP when exporting but I have no clue what it does and how to experiment with that kind of parameter? I was wondering and hoping that I could get some advice (or a link to a guide regarding this) on how to export my AVCHD 4:2:0 video to MP4 with fewer artifacts (if it's even possible).

    I'm looking forward for your replies! :) / AplAy.

    P.S. Here's info about the exported video file:

    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42
    File size : 29.5 MiB
    Duration : 30s 0ms
    Overall bit rate mode : Variable
    Overall bit rate : 8 248 Kbps
    Encoded date : UTC 2015-03-20 13:48:43
    Tagged date : UTC 2015-03-20 13:48:43
    ©TIM : 00:00:00:00
    ©TSC : 25
    ©TSZ : 1

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.0
    Format settings, CABAC : Yes
    Format settings, ReFrames : 3 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 30s 0ms
    Bit rate mode : Variable
    Bit rate : 8 000 Kbps
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 25.000 fps
    Standard : PAL
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.154
    Stream size : 28.3 MiB (96%)
    Language : English
    Encoded date : UTC 2015-03-20 13:48:43
    Tagged date : UTC 2015-03-20 13:48:43
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709
     
  2. attar

    attar Senior member

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  3. AplAy

    AplAy Member

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    Thank you very much for your fast reply!

    Alright, I have posted a post there as well in the "conversion" section.

    You're really sure NO ONE here can give me advice on codecs when exporting? :)

    Thanks in advance once again! / AplAy.
     
  4. attar

    attar Senior member

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    In my case I'm not familiar with the source format (from the cam) and can't offer anything for re-compressing it.
    To be candid, I didn't notice anything jarring with the YouTube clip.
     

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