On Thursday, December 16, 2021, Terje J. Hanssen via Cin < [email protected]> wrote:
> 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/[email protected]/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 I think I personally will be away from my desktop machine for few more months.. Terje, you already subscribed to ffmpeg-users, may be forward your call for testing to this list too? I was think about one specific Youtuber https://www.youtube.com/user/renerebe he does have quite a bit of exotic/non-x86 hw, so may be he will be able to get capture card(s) we talked about and even compile Cin on some non-x86 devices and/or test our BD output on Playstation 3 :-) > > > Terje J. H > > > > > > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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