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[HELP] what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - Printable Version

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what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 07.04.2020

a original video file, 1080i, 7.46GB, i only want to Deinterlace and get the best quality 1080P file, so in hybrid need to set X264? and how the bitrate part setting?

encoding mode choose "average bitrate (1-pass)"?

Bitrate (kbit/s): 17300.    is it right to set the number 17300 base on the original file? Thanks for help.



here is the original file info below:

General
Unique ID                      : 187377166985269172262150344274608508568 (0x8CF787990D4DE86AB7EB267B72E5CE98)
Complete name                  : SBS.You.Who.Came.From.The.Stars.2013.Ep10.HDTV.1080i.MPEG2.AC3@cdq119.mkv
Format                        : Matroska
Format version                : Version 4
File size                      : 7.46 GiB
Duration                      : 59 min 4 s
Overall bit rate mode          : Variable
Overall bit rate              : 18.1 Mb/s
Encoded date                  : UTC 2016-04-04 08:50:17
Writing application            : mkvmerge v9.0.1 ('Obstacles') 32bit
Writing library                : libebml v1.3.3 + libmatroska v1.4.4

Video
ID                            : 1
Format                        : MPEG Video
Format version                : Version 2
Format profile                : Main@High
Format settings                : BVOP
Format settings, BVOP          : Yes
Format settings, Matrix        : Default
Format settings, GOP          : Variable
Format settings, picture struc : Frame
Codec ID                      : V_MPEG2
Codec ID/Info                  : MPEG 1 or 2 Video
Duration                      : 59 min 4 s
Bit rate mode                  : Variable
Bit rate                      : 17.3 Mb/s
Maximum bit rate              : 17.7 Mb/s
Width                          : 1 920 pixels
Height                        : 1 080 pixels
Display aspect ratio          : 16:9
Active Format Description      : Full frame 16:9 image
Frame rate mode                : Constant
Frame rate                    : 29.970 (30000/1001) FPS
Color space                    : YUV
Chroma subsampling            : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                    : Top Field First
Compression mode              : Lossy
Bits/(Pixel*Frame)            : 0.278
Time code of first frame      : 00:00:00;00
Time code source              : Group of pictures header
GOP, Open/Closed              : Open
GOP, Open/Closed of first fram : Closed
Stream size                    : 7.14 GiB (96%)
Default                        : Yes
Forced                        : No

Audio #1
ID                            : 2
Format                        : AC-3
Format/Info                    : Audio Coding 3
Commercial name                : Dolby Digital
Codec ID                      : A_AC3
Duration                      : 59 min 4 s
Bit rate mode                  : Constant
Bit rate                      : 384 kb/s
Channel(s)                    : 2 channels
Channel layout                : L R
Sampling rate                  : 48.0 kHz
Frame rate                    : 31.250 FPS (1536 SPF)
Bit depth                      : 16 bits
Compression mode              : Lossy
Stream size                    : 162 MiB (2%)
Title                          : 韩语原音
Language                      : Korean
Service kind                  : Complete Main
Default                        : Yes
Forced                        : No

Audio #2
ID                            : 3
Format                        : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                      : A_AAC-2
Duration                      : 59 min 4 s
Bit rate                      : 128 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
Delay relative to video        : 14 ms
Stream size                    : 54.1 MiB (1%)
Title                          : 纬来戏剧国语（李世扬版主配）
Language                      : Chinese
Default                        : No
Forced                        : No

Audio #3
ID                            : 4
Format                        : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                      : A_AAC-2
Duration                      : 59 min 4 s
Bit rate                      : 128 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
Delay relative to video        : 14 ms
Stream size                    : 54.1 MiB (1%)
Title                          : oneHD国语（康殿宏主配）
Language                      : Chinese
Default                        : No
Forced                        : No

Audio #4
ID                            : 5
Format                        : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                      : A_AAC-2
Duration                      : 59 min 4 s
Bit rate                      : 128 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
Delay relative to video        : 14 ms
Stream size                    : 54.1 MiB (1%)
Title                          : 粤语
Language                      : Chinese
Default                        : No
Forced                        : No

Text #1
ID                            : 6
Format                        : UTF-8
Codec ID                      : S_TEXT/UTF8
Codec ID/Info                  : UTF-8 Plain Text
Duration                      : 58 min 51 s
Bit rate                      : 58 b/s
Count of elements              : 982
Stream size                    : 25.4 KiB (0%)
Title                          : 简体中文
Language                      : Chinese
Default                        : Yes
Forced                        : No

Text #2
ID                            : 7
Format                        : UTF-8
Codec ID                      : S_TEXT/UTF8
Codec ID/Info                  : UTF-8 Plain Text
Duration                      : 58 min 51 s
Bit rate                      : 58 b/s
Count of elements              : 982
Stream size                    : 25.4 KiB (0%)
Title                          : 繁体中文
Language                      : Chinese
Default                        : No
Forced                        : No

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - Selur - 07.04.2020

Quote:a original video file, 1080i, 7.46GB, i only want to Deinterlace and get the best quality 1080P file, so in hybrid need to set X264?
personally I would use x265, since for HD and higher resolutions is usually preserves more quality at the same bitrate.
Quote: and how the bitrate part setting?
encoding mode choose "average bitrate (1-pass)"?
If you want to keep the file at the same size (= average bitrate) better use 2pass encoding.

Quote:Bitrate (kbit/s): 17300. is it right to set the number 17300 base on the original file?
I would say: No, since you also change the format from MPEG-2 to MPEG-4 AVC/HEVC.

If it's mainly about preserving quality I would say:
forget the bit rate and reencode using a 'constant rate factor'.
Try on a sample to see which ratefactor preserves enough details for you while lowering the file size enough.
(I would recommend to start with values around 16-24)

Cu Selur

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 07.04.2020

yeah, thank you. i tried. if using x264, keep the same bitrate, 17300K, average 1-pass, with Avisynth QTGMC, the finished encoded file size is almost like the original one, about more than 7.5G, the quality is almost the same through naked eye, though file size is big, the no loss quality is all i want.

but using x265, i don't know how to set the specific bitrate to achieve the same result by x264 average 1-pass 17300K, is there a way to conversion the bitrate between x265 and x264?

i tried using x265, keep the same bitrate, 17300K, average 1-pass, with Avisynth QTGMC, the encoded file is only little smaller than the x264 encoded, and seems no difference with quality.


MPEG2 to MPEG4, by x264 or by x265, is there any bitrate conversion way for no loss convert? thanks

and if is it possible to using Hybrid to convert MPEG2 video to MPEG2 video? keep the same original encode, but with with Avisynth QTGMC, only deinterlace, no matter how big the file size . i see in the list, the video list should set to "passthrough" to keep the MPEG2 encode?

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - sunarowicz - 07.04.2020

Keeping the original birtate when converting from MPEG2 to x284 or x285 is pointless to me. You just waste you storage space, nothing else. The perceived quality won't be better than in case of much smaller output file. Follow Selur's proposal on constant rate factor and its recommended values instead.

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 08.04.2020

(07.04.2020, 17:26)Selur Wrote: If it's mainly about preserving quality I would say:
forget the bit rate and reencode using a 'constant rate factor'.
Try on a sample to see which ratefactor preserves enough details for you while lowering the file size enough.
(I would recommend to start with values around 16-24)

Cu Selur


hi , if a 1080i AVC file, means x264 already, need to deinterlace with no loss to get a 1080P file , keep the same bitrate, using x264, average 1-pass, with Avisynth QTGMC, MPEG4 to MPEG4, the finished encoded file will be the same quality with no loss?

or in the Base tab, set the "video" to "passthrough all" to deinterlace to get the no loss quality file ?

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 08.04.2020

(07.04.2020, 23:13)sunarowicz Wrote: Keeping the original birtate when converting from MPEG2 to x284 or x285 is pointless to me. You just waste you storage space, nothing else. The perceived quality won't be better than in case of much smaller output file. Follow Selur's proposal on constant rate factor and its recommended values instead.


i only want the no loss file, don't care about the storage space.

if a 1080i AVC file, means x264 already, need to deinterlace with no loss to get a 1080P file , keep the same bitrate, using x264, average 1-pass, with Avisynth QTGMC, MPEG4 to MPEG4, the finished encoded file will be the same quality with no loss?

or in the Base tab, set the "video" to "passthrough all" to deinterlace to get the no loss quality file ?

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - Selur - 08.04.2020

passthrough = video will not be changed.
If you want to deinterlace you need to reencode.

Cu Selur

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 08.04.2020

(08.04.2020, 20:10)Selur Wrote: passthrough = video will not be changed.
If you want to deinterlace you need to reencode.

Cu Selur


yes, i reencode with x264 and x265 for test, but the result is a little different.

the right is x264, left is x265
[Image: 6qdw8.jpg]

why x264 seems more lighter, or to say, x265 is more darker?

the original 1080i bitrate is 17300, i using x264 average bitrate 1-pass, half of bitrate 17300, the number of 8650 to encode, because i learn from internet that mpeg2 to mpeg4 with x264, using half of the original bitrate can get the same quality.  

and x265 using average bitrate 1-pass too, bitrate is 1/4 of 17300, the number of 4330, because i learn from internet that mpeg2 to mpeg4 with x265, using quarter of the original bitrate can get the same quality.


the quality seems almost the same by both using x264 and x265 for deinterlace, but why the little difference occur, x265 seems more darker, and x264 seems more lighter


and this is the 1080i original snapshot:
[Image: 6qeii.jpg]

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - Selur - 08.04.2020

Probably either missing/wrong VUI flags or a problem of the decoder.
Color doesn't differ here between x264 and x265 encodes.

Cu Selur

RE: what's the best way to QTGMC Deinterlace with no loss by using Hybrid? - ssdde - 09.04.2020

(08.04.2020, 22:07)Selur Wrote: Probably either missing/wrong VUI flags or a problem of the decoder.
Color doesn't differ here between x264 and x265 encodes.

Cu Selur


i'm using the dev version you send me, and you can see from the snapshot clearly,

on the right x265 is a little darker than the left x264,

and the x264 quality is more closer to the original 1080i.