[Cin] MLRAW

[Andrew Randrianasulu]

В сообщении от Wednesday 13 February 2019 00:56:50 edouard chalaron написал(а):
> Point was to avoid huge intermediate files, I think, and save some
> time, too.
> But well, ffmpeg apparently handles those files a bit wrongly - for
> example by
> default it tries to stuff data into just rgb24 - probably ok for
> display, but
> whole point of those huge  raw files was additional color precision
> (and
> avoidance of h264 artefacts).
>
> Agreed but there is a trade off between time and storage.Storage
> getting cheaper by the minute, I choose to use storage, on RAID0 or
> SSDs
> I read that you want to avoid big files and also avoid h264 artefacts,
> fair enough, I think everyone would like it.Truth is ... I don't
> believe it's that possible. Exporting Raw to H264 for editing is not a
> good idea anyway as you mentionnedAnd getting Raw to a readable format
> is not fast and it has to be done at some at some stage.
> Unless GG comes up with another miracle ! :-D
> So which codec then .. PRORES does handle 10 bits and up 4444, which is
> pretty good for color resolution.DNX was better but more limiting and
> not sure if it handles more than 24with PRORES you can throw any
> geometry, frame rate, color depth or about
> You can also export in TIFF either 24 or 48 bits with ffmpeg (even more
> than 48 actually), depending on your source.Cin is very fast to open a
> sequence of TIFF files.Then you are sure that you are not loosing any
> color info, PRORES still being a (slightly) lossy codec.
> I dont think there is any point exporting in h264 unless you do a
> lossless, but then ... export in TIFF files, faster / better. A bit of
> a Neanderthal solution, I agree, but reliable.
> As for ffmpeg reading the stream, ffmpeg won't find out, it's raw
> video, there is zero info as per what ffmpeg should read, hence the
> command line aboveIn my case it's either rgbXX or bgrXX (I think there
> is more than just these 2 though) As I see it, trying to incorporate
> raw video in Cin* is reinventing the wheel.There is already the tools
> needed for conversion and Cinelerra is an editing software not a video
> converter.
> Just sharing my experience / needs / ideas etc ... CheersEd

Thanks! Sure, I was pointed at already-existing pre-processor/convertor, posted 
link to Cin forum. It sort of assumes proprietary software inter-action (Final 
Cut Pro), but may be things can be worked other way around, and so they will 
add Cinelerra on linux :}

(but for this developer(s) of this software must be aware about  Cinelerra )

https://www.youtube.com/watch?v=-mmnG5uBJok (english version, MLVapp review)


>
> > from  https://thndl.com/life-without-artifacts.html
> >
> > ------quote---------
> > So, I've taken the plunge and moved to RAW. I have hundreds of
> > gigabytes
> > (seriously) of artifact-free footage recorded in the latest Magic
> > Lantern MLV
> > (RAW v2) file format. Now what. How do I watch it?
> > The tools seem to be lagging a bit behind here. The start of most
> > "workflow"
> > right now is to use the mlv2dng tool to create individual files for
> > each raw
> > frame in the video in Adobe's widely understood DNG format.
> > If you have a Mac or Windows, those thousands of DNGS can then be
> > imported
> > either into a tool like Adobe After Effects, or DaVinci Resolve
> > (which
> > currently needs an NVIDIA GPU). Those allow fine control of colour
> > mapping
> > (usually called "grading") and other effects using the full colur
> > resolution,
> > before you finally convert the result into a compressed video.
> > If you're using Linux, like me, different options are needed. A not-
> > so-quick but
> > dirty way to preview the video is to use a couple of commands like:
> > dcraw -T *.dng
> > ffmpeg -i %6d.tiff -vcodec mjpeg -r 25 -q:v 1 video.avi
> >
> > This can still take a little while to churn through the images, and
> > then ffmpeg
> > doesn't always seem to do a great job mapping the colour ranges. But
> > it works.
> > Only don't forget to delete all the intermediate files afterwards
> > otherwise you
> > will have quintupled your file space.
> > This approach quickly got tedious for me after working with more than
> > a few
> > videos. What I really wanted was something that could just play all
> > the raw
> > videos directly like any other video format, so I could decide which
> > ones
> > deserved further editing.
> >
> > --------------end of quote----
> >
> > quote above talks about  MLV files specifically
> >
> > > Depending on the machine bgr24/48 may need to be rgb24/48. I use
> > > either
> > > of them depending on the camera I use
> > > Only if my assumption of the rawvideo concept is what we are
> > > talking
> > > about here !CheersEd
> > >
> > > On Tue, 2019-02-12 at 12:53 -0700, Phyllis Smith wrote:
> > > > This morning GG had time to look at this.  (BTW, he is not much
> > > > for
> > > > reading or writing email so I have to let him know and then type
> > > > in
> > > > his response, so sometimes I do not get it all conveyed
> > > > correctly).
> > > >
> > > > When I initially read only a few of the 86 pages, I searched for
> > > > some
> > > > download MLV examples and downloaded a couple from one place and
> > > > then
> > > > 1 from where Andrew mentioned.  Apparently ffmpeg can load them
> > > > into
> > > > cinelerra and the Video compression in Info is rawvideo, but of
> > > > course they look awful as is (maybe a proper LUT would solve
> > > > this?).
> > > >
> > > > We also checked to see if "dcraw" of Dave Coffin handles this raw
> > > > format as that is his area of expertise and saw no reference on
> > > > his
> > > > web site concerning Magic Lantern.  But we still tried using
> > > > Cinelerra's probe order in Settings to see whether his included
> > > > program handled it.  It did not.
> > > >
> > > > Bottom line is that if there is ever a user who really needs to
> > > > be
> > > > able to handle MLV files in cinelerra, gg could see about doing
> > > > that
> > > > and will keep this in mind.   gg/Phyllis