'image2' not 'image 2' >But I can give those manual commands on the single frames gotten with >$ ffmpeg -i VIDEO.mkv -f image 2 DIR/SINGLE-FRAMES-%5d.png >(that ffmpeg command gives you exact frames, 30 per second in my case, >in PNG format)
The Cinelerra Motion Stabilization PART 2 video, that I am preparing will, hopefully, be clear real world example illustrating, or at least giving a hint for the scenario that Cinelerra devs, I guess, will sooner or later embark on, by the necessity of progress in this matter (Pls. don't attribute it to my wish when this, I bet, verifies, it is purely logical that this be the next step for our good ole devs who make this great program!). What I did (and I appologize for more typos in the first successful message on this "Motion plugin great, but perspective correction impossible" topic, such as 'image 2' instead of 'image2' in one of the ffmpeg lines), is, now from my command line history I am taking, the following. ln -s ../SOMEWHERE/on_my_box/complete_half_our_video.mkv \ KrugTrg_Cinelerra_IM.mkv mkdir Try04/ ffmpeg -ss 123 -i KrugTrg_Cinelerra_IM.mkv -f image2 -frames:v 300 \ Try04/kt-%5d.png gwenview Try04/ & ffmpeg -r 30 -i Try04/kt-%5d.png -map 0:v -r 30 -c:v libx264 -g 10 \ KrugTrg_Cinelerra_IM_SAMPLE.mkv mkdir Try04_RE/ ffmpeg -ss 0 -i KrugTrg_Cinelerra_IM_SAMPLE.mkv -f image2 \ Try04_RE/kt-%5d.png gwenview Try04_RE/ & I just link the half our video and called it, by virtue of the symlink, KrugTrg_Cinelerra_IM.mkv, in the current dir (IM for imagemagick). There's three ffmpeg lines above. Devs, pls. skip this, this explanation is for the newbies. The '-ss 123' in the first ffmpeg line starts churning out images from 2min 3 sec of the video, and '-frames:v 300', since video is 30fps, limit the output to (300/30 is) 10 seconds of video. That is our sample. gwenview is the fine GNU/Linux program I view those images in (I really love GNU/Linux, and the licence and the freedom of it is sacred, and under attack, if you didn't know, but I could only try and make a new topic on this, cannot talk of that in this topic). The options '-r 30' in the second ffmpeg line is given two times, and I don't know it both are needed. What I do know is, it's pretty perfect ffmpeg program at work here, and I notice no losses really when turning videos into pics and then pics into videos, even a few times! '-g 10' is non-essential in this story, for completeness, it makes my videos cut-able to around 0.1 seconds intervals, usually. Can omit it here. Because, what I got with the third ffmpeg line, where, sure, the '-ss 0' can be omitted, just like no '-frames:v number' option wasn't needed, because we already had exactly the 300 frames to make, is exactly the SAMPLE video that is drawn out of the exact 300 frames from the video, regardless, or at least very nearly regardless (i.e. without perceptible losses), of the number of '-f image2' conversions to pics and than back to video. That is why I will post the video to get users' and devs' opinion in this matter, if possible. I'll do so because I believe that my steps can be fine replicated by users' and devs' by simply downloading this video to their computers. ...And doing so much more than what I was able to, the devs, if they decide to wrestle a little with the Motion plugin... or at least, regular users, reasonably well understanding my concerns. I'm sure that adding the perspective correction (or differently named feature, but doing that) to motion stabilization is not itching only me. Before I upload the video, I need to explain here that I could possibly be at the mercy of Google/Youtube local bullies here. No more words on them, it's too ugly note in a fine story. (I do have to notice that uploaded 1440x1080 PART 1 video wasn't fully shown as such, but only as 960x720, when I downloaded it, but I have to say that the losses are not much perceptible in the part that I will point you in the next paragraph. So possibly not really a problem _here_ but they did downsize with serious losses my videos in the past! Oh yes!) Just, I will upload my flowstamped video (flowstamp being my bash-script program, that I intend to release soon, flowstamped very marginally, too few even and smooth -but not glossy!- surfaces to notice parts of words www.CroatiaFidelis.hr and Miroslav Rovis along with the sha256 number that identifies the original Samsung Galaxy II camera video of 0:27:53 length, the intention on my part is not to bother viewers with too visible stamp) as was taken and as it is preserved. No losses. 1920x1080, true high resolution video, as anybody can see in the Cinelerra Motion Stabilization PART 1, go to 5:40 of the video, the "Boos and Three Claps for the President" part. Pls. do and through comparison of the small area covered, and the loss, here, which is certainly significant loss, with the screen capture command... [[ This is that command: ffmpeg -f pulse -i default -f x11grab -s xga -r 25 -i :0.0 \ -vcodec libx264 -preset ultrafast -threads 0 \ Screen_`date +%y%m%d_%H%M`_`hostname`.avi ]] ...you should figure out that the video of the 10 seconds that I am about to post should come out pretty neat for you. Thinking more about it, I can't really tell if their reediting the video, automatic (I have also witnessed purpuseful real time, as my video comes, usually malicious, reediting by those non-gentlemen) usually, would change the ordering of frames. But let me upload now that video and I'll continue from this dilemma just expressed. I have to say just one thing. I am never certain when they could go bonkers and cut my very internet connection completely down and out for all intents and puposes (they did so on some two occasions), so in case you don't read from me more, that (or worse) could be the matter. Miroslav Rovis Vankina 4, Zagreb, Croatia m.ro...@inet.hr #rarely used, regime-pestered miro.ro...@gmail.com #rarely used, regime-pestered +385 (0)1 660 2633 +385 (0)91 266 0202 #=== was sentenced to jail, 2 ys on parole, for political views, essentially http://www.croatiafidelis.hr/Miroslav_Rovis_politicki_progon/ # but no English there at this time http://www.exDeo.com http://groups.google.com/forum/?fromgroups#!forum/croatian-news http://www.youtube.com/user/miroR2 http://vimeo.com/user9621785 _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://lists.skolelinux.org/listinfo/cinelerra
