Den 28.12.2021 05:42, skrev Andrew Randrianasulu:
On Monday, December 27, 2021, Terje J. Hanssen
<[email protected]> wrote:
Den 26.12.2021 23:44, skrev Andrew Randrianasulu:
On Monday, December 27, 2021, Terje J. Hanssen via Cin
<[email protected]> wrote:
Den 26.12.2021 21:13, skrev Andrew Randrianasulu via Cin:
On Sunday, December 26, 2021, Phyllis Smith via Cin
<[email protected]> wrote:
for now it seems only ffv1.avi defaults to v.0
and mkv
defaults to 3.4
For now, how about if I just add a comment to
ffv1.mkv about
level numbers? That way the user will see this
if they look
and can decide for themselves. Otherwise if we
make every
possible setting available we will end up with
millions of
choices and then if we have new ones labeled _3,
when level 4
comes along we would need even more as _4.
ok, add comment please}
Ok, maybe I'm thinking aload quite "outside the box" here
with my
questions * below:
I seems for me Cin-GG supports ffv1.mkv in two instances
(did't
find other mentioned in the manual either):
1) File > Save as: ffv1.mkv (that is save current
edited video
from Cin-GG)
and
2) File > Record
using Video compression according to
Settings > Preferences > Record
File format: FFMPEG mkv
Video wrench: Compression: ffv1.mkv or
user_ffv1.mkv
* Could i.e the empty <Format box> here be used to input
levels and/or other user options?
Further down on this window
Video IN
Record driver: i.e Video4Linux
* Or possibly get BM Intensity/declink SDK card
working/integrated with ffmpeg/Cin-GG?
if you find programmer familiar with both ends.. Cin-gg uses
her own code for dealing with v4l2, not ffmpeg's.
So Cin-gg doesn't use ffmpeg to capture/record video directly from
a video/TV capture card?
she uses ffmpeg for compression/muxing (and some effects), but not for
interfacing with device...
But I'm not sure I really understand where Record/prefs/preset
ffv1.mkv (2 above) get into this picture?
Just to record (encode and save) the pre-captured video in a
lossless ffv1.mkv file format?
no, you are right - this option selects capture codec
What would possible benefits be if ffmpeg had been used to
capture/record video via the capture card?
Or do we miss something without ffmpeg doing this?
we miss declink support )
Thank you for explaining and clarifying this.
Or said in another way, if ffmpeg had been implemented also for
capturing in Cin-GG (to compare with "ffmpeg first"), ffmpeg could have
be utilized (used) to support video capture and playback with both V4L2,
Decklink or other cards(?)
With the possibility to record uncompressed video in FFV1.mkv in
realtime, if and when the hardwares manage the bit rate.
https://trac.ffmpeg.org/wiki/Capture/V4L2_ALSA
http://underpop.online.fr/f/ffmpeg/help/decklink.htm.gz
In the case of BM Decklink or Intensity Pro 4k, Media Express is
available (deb, rpm on Linux) for free capture and playback
uncompressed 8 or 10-bit video or compressed ProRes.
I also noticed there is no way to capture 10 bit rgb/yuv via v4l2.. (
(simply no define for such formats)
https://github.com/torvalds/linux/blob/master/include/uapi/linux/videodev2.h
<https://github.com/torvalds/linux/blob/master/include/uapi/linux/videodev2.h>
A forum user had found out that Quicktime uncompressed 10 bit
4:2:2 .MOV was the same codec as AJA v210 for 10-bit uncompressed,
i.e. it did not require rendering when placed into the FCP
timeline. Bit rates examples:
625 PAL uncompressed 10 bit @ 720 x 576 @ 25fps = 26 MB per/sec,
or 93 GB per/hr.
720p HDTV uncompressed 10 bit @ 1280 x 720 @ 59.94 = 140 MB
per/sec, or 494 GB per/hr.
1080i and 1080p HDTV uncompressed:
10 bit @ 1920 x 1080 @ 25fps = 132 MB per/sec, or 463 GB per/hr.
yeah, and if you want more than 1 stream multiply this by num. of
streams..
Not so important here, but I complement:
The above bit rates and file sizes were found in papers for my Hyperdeck
Shuttle 2 SSD recorder (external), which was said to record 10 bit
uncompressed 4:2:2 video in QT .mov identical with Decklink cards. Now
I've found some smaller number sizes in the 2008 operation manual for
Intensity Pro card (the version replaced with Pro 4k):
SD 4:2:2 PAL uncompressed 10 bit @ 720 x 576 @ 25fps = 21.5 MB
per/sec, or 75.5 GB per/hr.
720p HDTV uncompressed 10 bit @ 1280 x 720 @ 59.94 = 106.8 MB
per/sec, or 375.7GB per/hr.
1080i HD 4:2:2 uncompressed:
1920 x 1080/50i = 100.3 MB per/sec, or 352.8 GB per/hr.
I don't know how the bit rates and file sizes can be calculated
differently for obviously identical cases(?)
https://gist.github.com/afriza/879fed4ede539a5a6501e0f046f71463
<https://gist.github.com/afriza/879fed4ede539a5a6501e0f046f71463>
(sdk 12 should be compatible with ffmpeg 4.4?)
note --extra-cflags="-I$HOME/ffmpeg_build/include
-I$HOME/ffmpeg_sources/BMD_SDK/include -I/usr/lib/cuda/include" \
and
--enable-nonfree \
--enable-decklink \
addditional confugure switches for ffmpeg (you can drop cuda
includes if you do not have proprietary nvidia driver/card
installed, if course)
---
List devices:
ffmpeg -f decklink -list_devices 1 -i dummy
List supported formats:
ffmpeg -f decklink -list_formats 1 -i 'DeckLink Quad HDMI
Recorder (1)'
Capture Camera at 23.976fps to h264:
ffmpeg -y -thread_queue_size 90 -hwaccel cuda \
-channels 2 -raw_format yuv422p10 -format_code 23ps -f
decklink -i 'DeckLink Quad HDMI Recorder (1)' \
-c:a pcm_s16le -c:v libx264 -preset ultrafast -crf 10
~/camera264.mov
---
obviously you can try to just copy frames into mov for 'as
uncompressed as possible' and hope your disk(s) will keep up!
(I've heard stories some ssd dislike being full - their write
speed drop down dramatically.. so try to write to not very
full ssd. Not sure abount newer nvme.. or raids from them!)
from
https://github.com/wonderunit/storyboarder/wiki/Recording-Live-Camera-and-Desktop-on-Linux-using-Blackmagic-Decklink
<https://github.com/wonderunit/storyboarder/wiki/Recording-Live-Camera-and-Desktop-on-Linux-using-Blackmagic-Decklink>
* Get the option to preserve/archive transcoded ffv1.mkv
directly to a storage device?
probably not? (no support for arbitrary compressed frames and
their metadata in internal representation.. not impossible,
but no one did it yet)
* And/or get the option to load /pipe (uncompressed) video
files recorded on one storage (SSD) device,
compress it with the right preset ffv1.mkv and save
it to
another storage device.
should be default mode of operation for files (not sure about
purely raw video w/o any container, apart from dvvideo, but
some types of raw rgb/yuv in avi/mov should work.. test a
bit?) , for piping...
try video loopback?
https://github.com/umlaeute/v4l2loopback
<https://github.com/umlaeute/v4l2loopback>
it may even work for declink input, if your ffmpeg can input
frames from declink and output to v4l2..
https://superuser.com/questions/1330959/what-is-the-right-ffmpeg-output-format-for-a-v4l2-loopback-device
<https://superuser.com/questions/1330959/what-is-the-right-ffmpeg-output-format-for-a-v4l2-loopback-device>
some variation of
ffmpeg examples
Grab desktop:
ffmpeg -f x11grab -framerate 25 -video_size 1280x720 -i
:0.0+0,0 -f v4l2 /dev/video0
Send file:
ffmpeg -re -i input.mp4 -f v4l2 /dev/video0
or (in answers)
ffmpeg -f x11grab -r 60 -s 1920x1080 -i :0.0+0,0 -vcodec
rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0
guess you can try variation of such cmdline with declink
input after compiling non-free ffmpeg with Blackmagick sdk...
we also probably can use such line for testing non-trivial
v4l2 formats in Cinelerra-gg ..
On Sat, Dec 25, 2021 at 9:29 PM Andrew
Randrianasulu via Cin
<[email protected]> wrote:
On Sunday, December 26, 2021, Terje J. Hanssen
via Cin
<[email protected]> wrote:
Den 25.12.2021 17:35, skrev Andrew
Randrianasulu via Cin:
seems to miss level=3 setting
$ cat bin/ffmpeg/video/ffv1.avi
avi ffv1
$ cat bin/ffmpeg/video/ffv1.mkv
matroska ffv1
threads=8
context=1
slices=30
$ cat bin/ffmpeg/video/ffv1.mov
mov ffv1
#coder=0
context=1
g=1
level=3
threads=16
slices=16
slicecrc=1
#pass=2
$
not sure if we should modify our
avi/mkv profikes
or add new (may be with _v3 name) ones?
Without own experience yet, I would ask if
there any
reason to not use the latest and more
feature rich
FFV1 level=version 3? Backward
compitibility, typical
can v. 3 uncompress v. 1 compressed archives?
good question... I have older avplay (~2012)
here and
will test.
for now it seems only ffv1.avi defaults to v.0
and mkv
defaults to 3.4 due to crc protection per
slice, i think
(looked into ffmpeg encoder source)
{filenames were just that I had in inputbox, not
indicative of content}
$ mediainfo ~/h265-p2.avi
General
Complete name :
/data/data/com.termux/files/home/h265-p2.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 8.82 MiB
Duration : 3 s 720 ms
Overall bit rate mode : Variable
Overall bit rate : 19.9 Mb/s
Writing application : Lavf58.76.100
Video
ID : 0
Format : FFV1
Format version : Version 0
Codec ID : FFV1
Duration : 3 s 720 ms
Bit rate mode : Variable
Bit rate : 19.9 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Compression mode : Lossless
Bits/(Pixel*Frame) : 1.916
Stream size : 8.81 MiB (100%)
coder_type : Golomb Rice
$ mediainfo ~/h265-p2.mkv
General
Unique ID : 3614689160526176147752985704114819283
(0x2B829EF6988D4EEDCB446A8612210D3)
Complete name :
/data/data/com.termux/files/home/h265-p2.mkv
Format : Matroska
Format version : Version 4
File size : 7.48 MiB
Duration : 3 s 80 ms
Overall bit rate mode : Variable
Overall bit rate : 20.4 Mb/s
Writing application : Lavf58.76.100
Writing library : Lavf58.76.100
ErrorDetectionType : Per level 1
Video
ID : 1
Format : FFV1
Format version : Version 3.4
Codec ID : V_MS/VFW/FOURCC / FFV1
Duration : 3 s 80 ms
Bit rate mode : Variable
Bit rate : 20.0 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossless
Bits/(Pixel*Frame) : 1.927
Stream size : 7.34 MiB (98%)
Default : Yes
Forced : No
Color range : Full
Matrix coefficients : BT.470 System B/G
coder_type : Golomb Rice
MaxSlicesCount : 30
ErrorDetectionType : Per slice
I conclude that a couple of referense
papers on the
web say and use level 3 in their
profile/presets:
1) Video into Matroska/FFV1
https://avpres.net/FFmpeg/im_FFV1.html
<https://avpres.net/FFmpeg/im_FFV1.html>
<https://avpres.net/FFmpeg/im_FFV1.html
<https://avpres.net/FFmpeg/im_FFV1.html>>
We advise to use only the version 3 of FFV1 in
production, because the version 1 is
deprecated, the
version 2 has never really existed, and
the version 4
is currently under development.
Transcode a video file using the FFV1
codec into the
Matroska container for preservation purposes.
Solution
ffmpeg \
-i input_file \
-c:v ffv1 \
-level 3 \
-coder 1 \
-context 1 \
-g 1 \
-slices 24 \
-slicecrc 1 \
-c:a copy \
output_file.mkv
2) Presets for FFV1 and MKV: Choosing the
right
parameters for the job (ffv1_params.pdf)
https://docs.google.com/viewer?url=https%3A%2F%2Fmediaarea.net%2FEvents%2F2019-12-05_NoTimeToWait4%2F03.%2520Peter%2520B.%2520-%2520Presets%2520for%2520FFV1%2520and%2520MKV%2C%2520Choosing%2520the%2520right%2520parameters%2520for%2520the%2520job%2Fffv1_params.pdf&pdf=true
<https://docs.google.com/viewer?url=https%3A%2F%2Fmediaarea.net%2FEvents%2F2019-12-05_NoTimeToWait4%2F03.%2520Peter%2520B.%2520-%2520Presets%2520for%2520FFV1%2520and%2520MKV%2C%2520Choosing%2520the%2520right%2520parameters%2520for%2520the%2520job%2Fffv1_params.pdf&pdf=true>
<https://docs.google.com/viewer?url=https%3A%2F%2Fmediaarea.net%2FEvents%2F2019-12-05_NoTimeToWait4%2F03.%2520Peter%2520B.%2520-%2520Presets%2520for%2520FFV1%2520and%2520MKV%2C%2520Choosing%2520the%2520right%2520parameters%2520for%2520the%2520job%2Fffv1_params.pdf&pdf=true
<https://docs.google.com/viewer?url=https%3A%2F%2Fmediaarea.net%2FEvents%2F2019-12-05_NoTimeToWait4%2F03.%2520Peter%2520B.%2520-%2520Presets%2520for%2520FFV1%2520and%2520MKV%2C%2520Choosing%2520the%2520right%2520parameters%2520for%2520the%2520job%2Fffv1_params.pdf&pdf=true>>
Level = FFV1 version
page 9 (of 30)
0
1 (Default)
3 (Recommended)
FFmpeg recipe (PAL)
page 27 (of 30)
ffmpeg -i VIDEO_IN \
-c:v ffv1 -level 3 -coder 1 -context 0
-slices 24
-slicecrc 1 \
-color_primaries bt470bg \
-color_trc bt709 \
-colorspace bt470bg \
-color_range mpeg \
-map 0 \
-top 1 \
-c:a copy \
-g 1 -pix_fmt + \
VIDEO_OUT.mkv
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