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TOPIC: Using GoPro LRV files as proxy

Using GoPro LRV files as proxy 2 weeks, 4 days ago #205583

  • DonSri
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Hi All, I have done few edit's with Lightworks. But I have some query regarding editing the GoPro video.
As you are aware GoPro camera creates *.LRV file which is effectively another MP4 file of the same video. However this is a low resolution video file that has been already created by the device itself. Is there a way to link this to High resolution video file in Lightworks; without creating proxy file again as it takes time and doing a redundant task in this case.

Re: Using GoPro LRV files as proxy 2 weeks, 4 days ago #205584

  • fishmonger
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Hi,
I wasn't aware of these, we've had plenty of GoPro samples but I don't think they came with any .lrv files, but you're right it sounds like we could use them instead of making proxies, do they just sit alongside the full resolution files? Do you have any samples we could test with?
thanks,
f
you can upload via :-
editshare.wetransfer.com/
Last Edit: 2 weeks, 4 days ago by fishmonger.

Re: Using GoPro LRV files as proxy 2 weeks, 3 days ago #205605

  • DonSri
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Please find the uploaded files here. we.tl/t-om9CIvtNnq
Yes you are correct those LRV files sit alongside the full resolution files.
Anyway note that LRVs are very low in resolution and frame-rate.
As you can see in the samples I have attached; full resolution file is 64MB and LRV file is even less than 1MB.

Re: Using GoPro LRV files as proxy 2 weeks, 3 days ago #205612

  • fishmonger
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OK, thanks - I've added support for the lrv file extension so we can now read them automatically, but I doubt they are good enough even for proxy usage, as you say - the frame rate and resolution are very low indeed, what do you think?
f

Re: Using GoPro LRV files as proxy 2 weeks, 3 days ago #205614

  • lghtwrks
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to clear that up....

can they be used _as lwks proxies_ without "generating" them from the original file ("autodetect proxies"/"set proxies"...)

or

lwks is able to "read" them now?

an [older] request was (for cams/equipment which auto generates proxies incam/inbox) to use/detect the already available proxies when available without generating them thru lwks.

greets
s

Re: Using GoPro LRV files as proxy 2 weeks, 3 days ago #205615

  • fishmonger
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They can be read, being able to use them as the lwks proxies would require more coding, I was questioning if it was worthwhile doing as the lrv proxies are such low quality.
Did you have any specific camera/equipment in mind? Mostly the work would be involved in establishing the correlation between the master and proxy file and generating the appropriate metadata.
f

Re: Using GoPro LRV files as proxy 2 weeks, 3 days ago #205617

  • hugly
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This .lvf file appears to be just a renamed MP4 file, in very low quality and frame rate - that's the mediainfo:
-----------------------------------------------------------------------------
General
Complete name : D:\Downloads\GL010467.LRV.mp4
Format : MPEG-4
Format profile : Base Media / Version 1
Codec ID : mp41 (mp41)
File size : 805 KiB
Duration : 8 s 592 ms
Overall bit rate mode : Variable
Overall bit rate : 768 kb/s
Encoded date : UTC 2019-08-10 10:27:24
Tagged date : UTC 2019-08-10 10:27:24

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.2
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Format settings, GOP : M=1, N=12
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8 s 592 ms
Bit rate mode : Variable
Bit rate : 506 kb/s
Maximum bit rate : 500 kb/s
Width : 432 pixels
Height : 240 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 11.988 (12000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.407
Stream size : 531 KiB (66%)
Title : GoPro AVC
Language : English
Encoded date : UTC 2019-08-10 10:27:24
Tagged date : UTC 2019-08-10 10:27:24
Color range : Full
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 : 8 s 512 ms
Bit rate mode : Constant
Bit rate : 192 kb/s
Nominal bit rate : 48.0 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 : 197 KiB (24%)
Title : GoPro AAC
Language : English
Encoded date : UTC 2019-08-10 10:27:24
Tagged date : UTC 2019-08-10 10:27:24

Other #1
Type : meta
Duration : 8 s 8 ms
Bit rate mode : Variable

Other #2
Type : meta
Bit rate mode : Variable
mdhd_Duration : 8592
-----------------------------------------------------------------------------

The frame rate appears to be 1/10th of the original. That's no big deal with 120 fps footage in 24 fps projects, but if that's also true for captures in standard frame rates, i.e. 24, 25, 30 fps, I doubt that I would use those files as proxies, if I had a GoPro. How should I cut somehow precisely with 10 duped frames and 9 out of 10 dropped?

My 2 cents.
It's better to travel well than to arrive...
Last Edit: 2 weeks, 3 days ago by hugly.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205625

  • DonSri
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Thanks for taking time for this. Compared to other videos Action Cams most of the time is kept on and it gather lot of footage. Also in the case of GoPro Hero Black it's 4k and 120 frames per second. So the time it takes to create proxies doesn't worth the actual amount of footage that we can get finally, as most of it will be cut out. Because of this case in my opinion it is worth to have a feature to use LRV as proxies.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205627

  • fishmonger
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Understood,thanks!
f

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205630

  • lghtwrks
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lightworks could have an "autodetect" proxy option on import for incamera proxies (eg red)

choose:

- same name,
eg. file1.r3d file1.mov
(lwks takes the smaller as proxy)

- set pefix/suffix/both names: pre: proxyP_ suf: _proxyS
could be...
file1.avi file1_proxyS.avi
file1.avi proxyP_file1.avi
file1.avi proxyP_file1_proxyS.avi

or - set pefix/suffix/both names: pre: P suf: S
file1.avi file1S.avi
file1.avi Pfile1.avi
file1.avi Pfile1S.avi


options after import:
- use dedicated proxy-dir / search rekursive
(files with same name/smaller, prefix, suffix pattern etc.) -> choose location

etc.

greets
simon
Last Edit: 2 weeks, 2 days ago by lghtwrks.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205632

  • schrauber
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I don't have those files. I suspect in theory also the main problem with the frame rate.
For normal playback it might be ok (assuming correct sync),
but when playback is stopped (or the playback speed is significantly reduced)
it would probably have to be switched automatically to the original to allow correct cuts and so on. However, this switching would take more time than would be the case if only Lightworks proxies were used.

These .lrv files are generally unsuitable for slow motion. But also for Lightworks proxies the question arises whether they use the original framerate or the project framerate?
And whether the original frame rate of the original material is used for slow motion in the respective project at all.
Mainly automatically translated
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Windows 10, 64 Bit
Intel i5-4440 (3,1 GHz) ; Intel HD Graphics 4600
Last Edit: 2 weeks, 2 days ago by schrauber.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205635

  • lghtwrks
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I'd move the development in the direction of using already available proxies for professional use, because the "LRV" files aren' the bees nees, but nice to have them imported for a preview with small size in 14.6. (<-> less network traffic)
s
Last Edit: 2 weeks, 2 days ago by lghtwrks.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205636

  • DonSri
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Thanks. Let me know once its ready for test. I would like to help this effort.

Re: Using GoPro LRV files as proxy 2 weeks, 2 days ago #205637

  • hugly
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schrauber wrote:
These .lrv files are generally unsuitable for slow motion. But also for Lightworks proxies the question arises whether they use the original framerate or the project framerate?
And whether the original frame rate of the original material is used for slow motion in the respective project at all.

I appreciate any new feature and I'm sure that supporting the .lrv files as proxies will make many GoPro users happy, if they are not forced to, but can select it as an option.

On the other hand, for any kind of serious work, independent from the frame rate, proxies have to match the originals, frame by frame. If internal proxies wouldn't follow that rule, it's better to create some with third party software and switch with Find clips to fill sequence. That's what people did prior to V14.0 and the function is still there and works.
It's better to travel well than to arrive...
Last Edit: 2 weeks, 2 days ago by hugly.
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