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TOPIC: export 4k looks bad

export 4k looks bad 2 weeks, 2 days ago #221041

  • Killer099
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Hi

I try to export to 4k, my source is 60 fps 4k (3840 x 2160) from a GoPro Hero 7.
So I think this should be possible?

I tried several codecs all the same except 1080p but that is not what I wan't...
Which export do I have to choose? Tried:
H.264/MP4 with DCI 4k, QFHD, QHD all with 60 fps. But video quality is pretty bad.

Thanks
Patrick

Re: export 4k looks bad 2 weeks, 2 days ago #221042

  • briandrys
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Welcome to the forum.

Which bit rate setting are you using on your export codecs?

Re: export 4k looks bad 2 weeks, 2 days ago #221044

  • Killer099
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same as the source, 59,94 fps

Re: export 4k looks bad 2 weeks, 2 days ago #221045

  • Killer099
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This is the media info of one file:

General
Complete name : D:\Videos\GoPro\2020\Motorrad\Sequence #1.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 852 MiB
Duration : 14 min 49 s
Overall bit rate mode : Variable
Overall bit rate : 8 033 kb/s
Encoded date : UTC 2020-06-24 16:12:00
Tagged date : UTC 2020-06-24 16:12:00

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.2
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 14 min 49 s
Source duration : 14 min 49 s
Bit rate mode : Variable
Bit rate : 7 647 kb/s
Maximum bit rate : 8 000 kb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.015
Stream size : 811 MiB (95%)
Source stream size : 811 MiB (95%)
Language : English
Encoded date : UTC 2020-06-24 16:12:00
Tagged date : UTC 2020-06-24 16:12:00
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 14 min 49 s
Bit rate mode : Variable
Bit rate : 384 kb/s
Maximum bit rate : 530 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 40.4 MiB (5%)
Language : English
Encoded date : UTC 2020-06-24 16:12:00
Tagged date : UTC 2020-06-24 16:12:00

Re: export 4k looks bad 2 weeks, 2 days ago #221046

  • schrauber
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Killer099 wrote:
same as the source, 59,94 fps

The same bit rate does not always mean the same quality. It depends on the encoding method and whether it is optimized for speed or small file size. I suspect your imported file is optimized for small file size.

Bit rate : 7 647 kb/s

This is only slightly more than Lightworks uses for 720p YouTube exports. I think that's far too little for 4k exports with Lightworks (although I can't test it with my license).
Mainly automatically translated
--------------------------------------------
Software: Lightworks 2020.1; || Windows 10, 64 Bit
Hardware: Intel i5-4440 (3,1 GHz); || shared RAM: 8 GB; || Intel HD Graphics 4600 (can use max. 2 GB of shared RAM)

Re: export 4k looks bad 2 weeks, 2 days ago #221047

  • hugly
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It's better to travel well than to arrive...

Re: export 4k looks bad 2 weeks, 1 day ago #221091

  • Killer099
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Thanks looks better now with settings:
min = 1
max = 68
avg = 48
=> DCI 4k

Did a short test with only a few minutes have to export the whole movie later, takes 1h...

What is the best size/rate I should choose?

Re: export 4k looks bad 2 weeks, 1 day ago #221096

  • hugly
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The dimensions of your video are 3840xx2160 pixels, which is commonly known as UHD (Ultra High Definition) or QFHD (Quad Full High Definition). The latter, QFHD, is used to label the format in Lightworks.

The frame rate of your video is 59.94 fps (NTSC 60 fps). Which frame rate is best to choose on export depends on the frame rate of your project.

To preserve all frames and to avoid any kind of intrinsic frame rate conversion, in particular if the recording shows a lot of motion, I'd suggest using a 60 fps project and exporting in 59.94 fps.

If you have to mix frame rates, e.g. 24, 25, 30, 60 , 240 fps, use a 24 fps project and export to 24 (or 23.98) fps. If you have to mix 30 and 60 fps, you can use either a 30 or a 60 fps project and export to 30 (or 29.97) fps.
It's better to travel well than to arrive...
Last Edit: 2 weeks, 1 day ago by hugly.
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