Den 10.12.2021 20:02, skrev Andrea paz:
So many interesting tutorials on the site you pointed out! Thank you.
I'll highlight a few pages. I guess these patches, in CinGG, are
useless: http://renomath.org/video/linux/cinelerra/
http://renomath.org/video/linux/interlace/cinelerra.html (color space
conversion) http://renomath.org/video/linux/dv/chroma.html There is
also a collection of scripts: http://renomath.org/video/linux/bin/
=========
The patches were initially written originally for HV4.2 and later
updated to HV4.4.
However to another user request, Phyllis responded in these 2016 posts:
[CinCV TNG] Patches from Eric Olson:
https://lists.cinelerra-cv.org/pipermail/cinelerra/2016q3/005251.html
A mod was added today by GG to 5.1 to correctly convert the colorspace for 4:2:0 / mpeg
in order to improve potential DVD quality. It is not just a "hack" but a real
improvement. But it is doubtful that this code will see much real use. New
binaries/packages will be built soon.
Below is the short explanation from the Features5 manual.
DvdInterlacedChroma [....]
----------
a plugin was checked into the Git repository for 5.1 after rework and
much testing
https://lists.cinelerra-cv.org/pipermail/cinelerra/2016q3/005291.html
Maybe Andrew can review and consider if the current Cin-GG w/FFmeg cover
up for the rest.
==========
I myself was then naturally especially interested in and focused on the
section "Capturing the Video" of the first guide, althoug I never bought
a capture card for Linux (after my Pinnacle DV500 DVD stayed Windows only):
ffmpeg -h | grep dv50
[...]
-target type specify target file type ("vcd", "svcd", "dvd", "dv"
or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
===========
#1. Hi8 Tape to DVD Video Workflow
http://renomath.org/video/linux/hi8/
If you have a faster system you may want to consider capturing using
the DV50 codec using a 4:2:2 color space. In order to do this, libng
from the xawtv project needs to be patched
<http://renomath.org/video/linux/hi8/streamer-dv50.patch> to
recognize the dv50 codec. Using dv50 as the capture codec really
allows the Linux solution to surpass a stand-along DVD recorder.
It is also possible to capture the video using ffmpeg or lavrec.
I was happy to get the above little section deepened in replies
2012/2013 from Eric Olson, and "allow myself to publish" the technical
parts as repetition and knowledge information between ===== below.
First, "streamer" below was is on openSUSE part of the rpm package
"v4l-tools":
Summary : Video4linux terminal / command line utilities
Description :
This package includes a bunch of command line utilities: v4lctl to
control video4linux devices; streamer to record movies; fbtv to watch
TV on the framebuffer console; ttv to watch tv on any ttv (powered by
aalib), webcam for capturing and uploading images, a curses radio
application, ...
Distribution: SUSE Linux Enterprise 15 SP3
---
man streamer
streamer - record audio and/or video
===============
After patching streamer with this patch
http://www.renomath.org/video/linux/hi8/streamer-dv50.patch
then the following command will capture an hour of NTSC video using
the DV50 codec
streamer -q -p3 -b64 -iS-Video -nNTSC-M -r29.97 -s720x480 \
-fdv5n -Fstereo -R48000 -t 1:00:00 -c /dev/video0 -o file.mov
This command works and captures 4:2:2 color on the few capture cards
I've tried. I have not tried to capture PAL format. I expect the
following command will work
streamer -q -p3 -b64 -iS-Video -nPAL -r25 -s720x576 \
-fdv5n -Fstereo -R48000 -t 1:00:00 -c /dev/video0 -o file.mov
The chroma resolution of an Hi8 tape is very low, but 4:2:2 color space
still helps while editing. The advantage of DV50 over DV25 may be more
significant for PAL because PAL DV25 uses an offset 4:2:0 colorspace
rather than 4:1:1 like NTSC DV25.
Some hardware seems to work better than others. Note that the default
contrast and brightness settings in the V4L drivers are wrong for most
hardware. Thus, it is important to calibrate the driver to correct
black levels before capture. I can't recommend any particular hardware
because the capture cards I use are old and no longer sold.
-----------
The quest for best quality is a frustrating one. Interlaced video
combined with 4:2:0 color and buggy software often make even good
quality difficult. I strongly believe that eventually people will
have the computational resources and know-how to obtain HD quality
footage from SD analog source.
It sounds like you have a nice collection of Hi8 tapes that need to
be archived. It is difficult to know which digital format to use.
In my opinion DV50 is a good archival choice because
1. it's a high-quality intraframe only codec
2. it's supported by almost all editing software
3. it's implemented in pro cameras
4. it won't change in the future
It would be nice to know what solution you settle on for digitizing
your tapes. Our of curiosity, what kind of BDROM blanks are you
using? Have any of the disks become unreadable over time?
------------
Cinelerra requires a simple patch to edit DV50. Unfortunately the only
format Cinelerra can edit without reencoding is mjpeg.
Uncompressed 8-bit 1440x1080 4:2:2 colorspace video is about 90MB/sec.
Most HD's can write between 40MB/sec and 100MB/sec. If your computer
can transcode HDV to DNxHD faster than real time there is a chance it
could compress live video on the fly. In my opinion the main use for
this would be low-budget green-screen studio work.
The comments at
http://web.archive.org/web/20080125111318/http://www.humanvalues.net/hdv/#dv25
are for NTSC DV25. PAL DV25 actually uses 4:2:0 chroma subsampling, but
the subsampling is different than what is used for DVD and possibly even
more difficult to convert. The program y4mscaler does a good job.
http://www.mir.com/DMG/Software/
For interlaced footage DV50 is definitely better.
HDV video is compatible with bluray but not the audio. If you transcode
the audio to AC3 or PCM and remultiplex, you should be able to play the
resulting files in a bluray player. If I have time, I'll put together a
description of this.
That is good news about the BDROMs you made. It would be nice if Linux
had a bluray authoring tool similar to dvdauthor. My current scheme is
to make the bluray menus using Sony Dvd Architect on Windows, and then
replace the video with high quality Linux x264 encodes using tsMuxeR.
------------
The openSUSE package is a "binary" package but you need to "source code"
to apply my patch. The source code is part of xawtv version 3 which can
be found at
http://git.linuxtv.org/xawtv3.git
Xawtv was used for the development of the video 4 linux drivers, so every
capture card supported by v4l and v4l2 should work with streamer.
From my recollection you are wishing to capture 8mm Hi8 video tapes from
a S-Video or YPbPr component cables fed through a Videonics TBC. Using
a TBC is a good idea and you should get reasonable results.
I'm currently looking at the Blackmagic Hyperdeck Shuttle. This is a
stand-alone device that records SD-SDI, HD-SDI and HDMI digital to a SSD
using either DNxHD, ProRes or uncompressed. Since the Shuttle only has
digital inputs you would also need a A/D video converter to capture from
component cables. The main advantage of the Shuttle, however, is that
it can also used for high quality live recording direct from the camera.
In particular, it is portable and can be attached to most cameras as a
high quality external recorder. If I get one, I'll let you know how well
it integrates into a Linux workflow.
I have updated my Cinelerra DNxHD, DV50 and YUV frame serving patches to
the Version 4.4 of Cinelerra
http://heroinewarrior.com/cinelerra.php
It seems to be working great. In addition to greater stability the new
version of Cinelerra has 3-way color correction.
---------------
From what I understand the Shuttle records SD uncompressed 4:2:2 about
1 1/2 hours on a 120GB SSD. This could then be converted to DV50 or
any other suitable format for long term storage on Linux. I'm mostly
interested in using it for live recording attached to the camera, but
it would be an added benefit if it could be used with a CPrPb to SDI
converter for high quality capture of analog soruces.
=============
Terje J. H
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