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

[ssdde]

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 ?