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Old 15th January 2017, 23:29   #1  |  Link
Bilbotorm
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Noob question: Best work flow to edit HD footage in Premiere and export in x265

Hello everyone,

I would like to raise a quick question as I tried to get back into the field after a couple of years babysitting (more than a couple actually).
I used to film my kids with a Sony HD camrecorder (PJ740) for 4 years now and have a tons of HD raw footage captured as follow:

ormat : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.2
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=15
Codec ID : 27
Duration : 51s 51ms
Bit rate mode : Variable
Bit rate : 1 150 Mbps
Maximum bit rate : 26.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 59.940 (60000/1001) fps

Long ago, when I acquired my cam, I made some attempts in Adobe Premier to edit footage and export it in h264. I played back then with lots of different settings and in the end...delayed delayed and delayed again to clearly work on it.

5 years later, I am stuck and now I decided to finally move forward the footage but tech evolved and I would like to know what would be the best approach to benefits from 2017 technology and export stuff in x265.

I don't care much about devices not ready for x265, or slow encoding process (quite a strong computer to do it), i only care about quality with best size (I don't want to spend TBs for nothing).

Therefore I was looking to export Adobe Premiere footage in raw HD using DNxHD MOV (as exporting matching source in Premiere results in exporting in MPEG2 60MBps which decrease quality (I can see it)) and then encoding the DNxHD MOV in handbrake in x265, using slow preset and Constant Quality around 16.

Do you have any advices on that idea ?

Thanks a lot for the time reading me
Cheers
Bil
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Old 16th January 2017, 08:18   #2  |  Link
smok3
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Sounds good. Only thing left is to figure out if this is 60p or interlaced and act accordingly. Edit: probably 60p. Personally I still wouldn't use x265, but stick with good old x264. The actual problem with such projects is the amount of editing needed, hours and hours and days and ...
p.s. Adobe media encoder 2017 does work rather well, so you can put all the exports into background while continue editing.

Last edited by smok3; 16th January 2017 at 10:15.
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Old 16th January 2017, 22:00   #3  |  Link
Bilbotorm
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Hello Smok3;

thanks for your input, indeed source is progressive

Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.202
Stream size : 299 MiB (94%)

I was used to Adobe doing shit back to h264 (and 5 years ago); not achieving a nice quality by default. Do you think it could perform well on h265 with media encoder ? what could be the settings then ? VBR is only 1 pass with my few attempts, so constant Bitrat ? or VBR ? by default, it's 7Mbps target, 10Mbps max; do you believe it's enough ?

thanks again !
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Old 17th January 2017, 12:18   #4  |  Link
smok3
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No, no, media encoder is for the intermediates (your DNxHD), use x264/x265 for final encodes.
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Old 18th January 2017, 01:17   #5  |  Link
Bilbotorm
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Ok thanks for confirming.

Any specific advice for VBR/CBR to target ? is Constant quality 16 a nice target ? any recommandations? For example, what's the CQ where x265 still make sense (same quality as x264 but lower size ?)

thanks !
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Old 19th January 2017, 18:11   #6  |  Link
benwaggoner
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Quote:
Originally Posted by Bilbotorm View Post
Ok thanks for confirming.

Any specific advice for VBR/CBR to target ? is Constant quality 16 a nice target ? any recommandations? For example, what's the CQ where x265 still make sense (same quality as x264 but lower size ?)

thanks !
I don't think there is a good scenario to use CQ with x265; CRF is basically CQ with a perceptual offset based on spatial complexity. However CQ and CRF don't map cleanly between x264 and x265, and the quality also varies with settings.

It seems like 16 is generally a "look great" value.
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