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  1. Herllo guys!

    Here is the short lossless original captured 4K video file (5GB)

    https://sendgb.com/7fZNs4iED29

    I recorded it in lossless NVENC_HEVC from the HDMI out with a laptop via Camlink 4K.

    HEre is the longer 2min version, which was later transcoded into a LOSSSY Hevc

    https://sendgb.com/O1nD0hIWqfv (4.2GB)

    Pay attention to the veining of the leaves and every little detail!

    What is your opinion about the video quality?
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  2. Video quality is good. It's a good sensor for a consumer camera in well lit conditions

    The re-encode removes some fine details and noise as expected, but it's still good considering the compression ratio is ~ 1:5 to 1:6

    If you posted the default onboard compression recording, I suspect the foliage detail would be very mushy, especially in the shadow areas such as underneath the trees. That would show the difference between default, and if a user should spend extra on external recording

    There is evidence that the camlink recording was quantized, as if some adjustments were made in 8bit - these don't negatively impact the image on this sample - but you can see gaps in a waveform. Maybe there are some settings you can adjust on the camlink or drivers
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  3. Originally Posted by poisondeathray View Post
    Video quality is good. It's a good sensor for a consumer camera in well lit conditions

    The re-encode removes some fine details and noise as expected, but it's still good considering the compression ratio is ~ 1:5 to 1:6

    If you posted the default onboard compression recording, I suspect the foliage detail would be very mushy, especially in the shadow areas such as underneath the trees. That would show the difference between default, and if a user should spend extra on external recording

    There is evidence that the camlink recording was quantized, as if some adjustments were made in 8bit - these don't negatively impact the image on this sample - but you can see gaps in a waveform. Maybe there are some settings you can adjust on the camlink or drivers
    Sorry Posondeathray, I made a mistake, I compressed the original video with 8bit NVENC HEVC, here is the 10bit lossy compressed version:

    https://sendgb.com/PENbJ9sRqpH

    It preserved more details than the 8bit NVENC_HEVC
    Last edited by Truthler; 30th Aug 2021 at 09:30.
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  4. Originally Posted by Truthler View Post

    Sorry Posondeathray, I made a mistake, I compressed the original video with 8bit NVENC HEVC, here is the 10bit lossy compressed version:

    https://sendgb.com/GRcTA3WgsrC

    It preserved more details than the 8bit NVENC_HEVC

    I don't see a mistake - The 2nd link in the 1st post was already 10bit420 HEVC - "LOSSY HEVC.mkv"

    Or did you mean original video, was the wrong original video ? ie . original recording was 8bit instead of 10bit ?

    I bet either re-encode looks better than the default onboard recording
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  5. Originally Posted by poisondeathray View Post
    Originally Posted by Truthler View Post

    Sorry Posondeathray, I made a mistake, I compressed the original video with 8bit NVENC HEVC, here is the 10bit lossy compressed version:

    https://sendgb.com/GRcTA3WgsrC

    It preserved more details than the 8bit NVENC_HEVC

    I don't see a mistake - The 2nd link in the 1st post was already 10bit420 HEVC - "LOSSY HEVC.mkv"

    Or did you mean original video, was the wrong original video ?

    I bet either re-encode looks better than the default onboard recording
    This second upload will be better, because there is no color shift.


    The moment when I felt that I can touch the leaflets of the trees on my Monitor: Watch this photo in full screen!

    http://users.atw.hu/educator/picture1.png
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  6. Yes, external recorder makes big difference. You should post example of onboard compression, to highlight differences

    Things like waving trees/leaves/foliage are very hard to compress and will turn to "mush" when using default onboard compression
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  7. Originally Posted by poisondeathray View Post
    Yes, external recorder makes big difference. You should post example of onboard compression, to highlight differences

    Things like waving trees/leaves/foliage are very hard to compress and will turn to "mush" when using default onboard compression

    I think it is also the 1" sensor, the XMOR RS version.

    Here is the development of XMOR sensors: https://www.framos.com/en/news/what-is-sony-s-exmor-technology-anyway

    Other consumer camcorders have smaller sensors, with more noise and lower real (visible) resolution, even the newsest Canon & Panasonic models have smaller sensors, because they manufacture large sensors only for their big broadcast and cinema videocameras, Sony always gives bigger sensor even for high-end consumer models... That makes the difference!
    Last edited by Truthler; 28th Aug 2021 at 15:43.
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  8. Originally Posted by poisondeathray View Post
    Yes, external recorder makes big difference. You should post example of onboard compression, to highlight differences

    Things like waving trees/leaves/foliage are very hard to compress and will turn to "mush" when using default onboard compression
    Did you play the files with Potplayer? Because the video was recorded in HLG format, and MPC and VLC play these videos with over saturization and over contrasting...

    Does it mean that these players (VLC and MPC-HC) have serious deficiencies?
    Last edited by Truthler; 30th Aug 2021 at 12:13.
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  9. If you recorded with specific settings, you have to use a LUT or tell the player what to use.

    There is no metadata in the NVENC file that tells player what to do

    e.g. if you record in slog2 or some other profile there is no way for player to know that so you get wrong playback
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  10. Originally Posted by poisondeathray View Post
    If you recorded with specific settings, you have to use a LUT or tell the player what to use.

    There is no metadata in the NVENC file that tells player what to do

    e.g. if you record in slog2 or some other profile there is no way for player to know that so you get wrong playback
    However Potplayer plays it correctly.... Other players can not handle the contrast and colors (over saturated) Is Potplayer more intelligent than other players?
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  11. Do you think the screenshot you posted in post#5 is accurate ? Is that what you "see" in potplayer ? How about when you were there (if you can remember) ?

    The main difference is just full vs. limited range. It's not actually using HLG to 709 mapping. So it's not really "smart" - it gets many camera footage wrong, because it simply cannot know what profile you shot with. You can se other player to use full range YCbCr to RGB , and it will look the same

    In order to display camera footage correctly, you must use correct display LUT
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  12. Originally Posted by poisondeathray View Post
    Do you think the screenshot you posted in post#5 is accurate ? Is that what you "see" in potplayer ? How about when you were there (if you can remember) ?

    The main difference is just full vs. limited range. It's not actually using HLG to 709 mapping. So it's not really "smart" - it gets many camera footage wrong, because it simply cannot know what profile you shot with. You can se other player to use full range YCbCr to RGB , and it will look the same

    In order to display camera footage correctly, you must use correct display LUT

    Hello Poisondeathray!

    What about this? (5GB lossless video)

    https://sendgb.com/slKxfzNgZq7

    Here is the snapshot: http://users.atw.hu/adatok1/bricks.png

    Visible individual brick pieces from 200-250m distance!
    Brutal, isn't it?
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