вс, 25 сент. 2022 г., 08:25 Miroslav Rovis via Cin < [email protected]>:
> I changed the subject line: 's/setting/presets/'. > > On 220924-17:55-0600, Phyllis Smith wrote: > > From my quick read, it sounds like a thorough analysis and > > great suggestion. I will have to read and look at all of this > > more carefully so it can be updated accordingly. And > > hopefully, Andrew or Andrea will have time to comment too. > > ...Phyllis > I'm not an expert, but I am an advanced user. Unfortunately, a > slow user too. I'm probably correct (except for imprecise > wordage) about this. > > Because (see below)... > > > On Sat, Sep 24, 2022 at 3:32 PM Miroslav Rovis via Cin < > > [email protected]> wrote: > > > > > It's simple, and my wording may not be quite precise, but > > > you guys and gals will understand. > > > > > > So, when using the setting in the render window, I figured > > > out that there are better settings to use than the presets > > > that are offered. And they are simpler too. > settings live in ${cin_src_root}/ffmpeg/video and yeah, no row-mt=1 there apart from av1 profile. I only have asymmetric arm 8 core in tablet, and two 4 x86-64 cores in desktop and laptop for testing.... > Because in this wiki page: > > > In essence, the Wiki page for VP9 can tell you all: > > > https://trac.ffmpeg.org/wiki/Encode/VP9 [*] > previously there were recommendation on VP9 that correspond with > the current presets in Cinelerra. The current version of VP9 > wiki page is, I believe, just a few months old. > > With the presets that I find in current Cinelerra; I'm yet to > open it today and work with it, but I choose preset that are > recommended for 1920x1080 30fps and then edit it as below. > > > I have no rendering, actually no Cinelerra opened right now, > > > so, from memory: > > > > > > It's just b=0, then add crf=31 (or other number), and then > > > row-mt=1, and remove the min and max settings from the > > > preset. > > > > > > I did use b=0 (which would correspond to -b 0 in the VP9 > > > wiki page (but I see only -b:v 0 in the page). And it did > > > work I can tell you. > > > > > > However, see there around: > > > "more contemporary CRF-style approach for the final pass to > > > achieve a certain perceptual quality" > > > and there is -b:v 0 in the second pass. > > > and around: > > > "must use a combination of -crf and -b:v 0. Note that -b:v > > > MUST be 0." > > > > > > Also find: > > > "FFmpeg added support for row based multithreading in > > > version 3.4, released on January 25th, 2018. As of libvpx > > > version 1.7.0 this multithreading enhancement is not enabled > > > by default and needs be manually activated with the -row-mt > > > 1 switch." > > > which I find works great as well on my systems. They are > > > relatively new: > > > AMD Ryzen 7 PRO 4750G > > > and also one: > > > AMD Ryzen 7 5700G > > > so if the above maybe would not work well on older machines, > > > then, don't know... > > > > > > So, this is a suggestion to improve the VP9 webm presets in > > > Cinelerra FFmpeg. > > > While I am getting better at understanding the source code, > > > I would still probably be to slow to find it and change it > > > and send a patch myself. Too slow. > > > And that would take me more time than I can set apart at > > > this time. > > > > > > Regards! > > > > > > --- > I have issues with motion plugin (or related to it). So I'll > reuse this part below (which is missing a [*] at the start, as I > meant the [*] above to refer to it) in a new, separate thread, > not so much related to FFmpeg VP9 presets. > > > I've been using VP9 (previously VP8) webm a lot. E.g. > > > anywhere you go from: > > > https://www.croatiafidelis.hr/2022/ > > > or, to take just one sample (4 minutes): > > > > > > > https://www.croatiafidelis.hr/2022/Jazovka/VID-2022-06-22-1034-Jazovka-procesija.webm > > > It's nothing but motion plugin set up, blur plugin in the > > > bottom video at 100%, and go render. Then work the audio > > > separately, mux and post. Of course, the stabilizing is > > > slow, motion plugin takes long to calculate. > > > > > > But all those people moving can be scrutinized in a lot of > > > detail, as if I filmed with a mobile phone attached to a > > > good stabilizer, and instead, the original was a shaky video > > > as ever, because I held the mobile with just my hand. > > > > > > Cinelerra can stabilize you videos well. It's worth the > > > time-expensive learning curve to get to know how to do it. > > > > > > Here are some comparison videos with both the shaky and > > > stabilized video (however I've gotten better since then, > > > these are all old, but I have no other comparisons) > > > > > > e.g. from: > > > https://www.croatiafidelis.hr/2019/ > > > the videos e.g.: > > > > > > > https://www.croatiafidelis.hr/2019/Jaska/190824-Jaska-Vukovic-demo-1-stabilize.webm > > > or from: > > > https://www.croatiafidelis.hr/2015/Macelj/Macelj-2-cmp.php > > > the video being: > > > > https://www.croatiafidelis.hr/2015/Macelj/150607-Macelj-HebrangCOMP.webm > > > > > > -- > > > Miroslav Rovis > > > Zagreb, Croatia > > > https://www.CroatiaFidelis.hr > > > my PGP-key: > > > > https://www.croatiafidelis.hr/FCF13245ED247DCE443855B7EA9884884FBAF0AE.asc > > > -- > > > Cin mailing list > > > [email protected] > > > https://lists.cinelerra-gg.org/mailman/listinfo/cin > > > > > -- > Miroslav Rovis > Zagreb, Croatia > https://www.CroatiaFidelis.hr > my PGP-key: > https://www.croatiafidelis.hr/FCF13245ED247DCE443855B7EA9884884FBAF0AE.asc > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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