With reference to Adam Wilt:
https://www.adamwilt.com/DV-FAQ-editing.html#transcoding
I-frame-only MPEG-2 is said to be comparable to DV format compression
at the same bit rate. Thus 25 megabit MPEG-2 should yield results (and
transcoding errors) similar to DV, and 50 Megabit MPEG-2 should be
comparable to DV50.
MPEG-2 at 25 Megabits should be roughly comparable to DV, though its
4:2:2 color sampling may be more beneficial for graphics. Are 25 Mbps
MPEG-2's benefits worth the transcoding hit coming from DV? It's
arguable: I've been comparing DV25 and MPEG-2 25Mbit, and can't say I
see a huge difference one way or the other. Both have their artifacts,
and their tradeoffs.
DV50 or MPEG-2 at 50 Megabits will be clearly superior in quality to
DV, albeit at twice the data rate (think about the disk space and disk
speed necessary). Indeed, if you're originating on DV50 (D-9,
DVCPRO50) there's no reason to go with anything other than a DV50 NLE,
using SDTI in place of 1394 for the transfer. The only way up from
DV50, practically speaking, is to to go totally uncompressed -- and
nowadays, that's increasingly viable, what with fast disks and
inexpensive arrays.
====================
As I already pointed on in another thread, a solution to capture Hi8 to
SD DV50 in 4:2:2 format was possible already 10 years ago
https://lists.cinelerra-gg.org/pipermail/cin/2021-December/004308.html
In a more recent thread here, Andrew mentioned a hdmi capture card (with
v4l2)
https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02865.html
===================
Therefore I wonder if we, CinGG users and devs, are able to setup and
test a recommended capture solution (w/card and guide) for SD and HD
video in 4:2:2 colorspace, preferably using free drivers and tools like
V4L/V4L2 and FFMpeg?
https://en.wikipedia.org/wiki/Video4Linux
https://www.linuxtv.org/wiki/index.php/V4L_capturing
Terje J. H
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