![]() (BTW, use this link to view the same doc but with comments enabled)ġ - More on this performance model later. Run stabilization in two passes There are plenty of options for libvidstab, like shakiness, accuracy, smoothing. (Yes, it’s a long paper printout of the Chrome DevTools timeline flamechart :) Presenting the 2021-era guide to pretty easy DIY video stabilization On Mac OS, install ffmpeg and vidstab from homebrew: 1 2 brew install ffmpeg brew install libvidstab On linux, you can sudo make install. Wikipedia eng team scrutinizing their performance millisecond by millisecond. Lastly, we’re using this research to improve Chrome DevTools and what you hear from Chrome. Depending on your shell, you may need to quote the map value. It’s fairly advanced, but I’m spelunking deep to identify how the sites butt heads with the browser APIs and architecture. 1 Answer Sorted by: 3 Use ffmpeg -i video1.mp4 -i video2.mp4 -filtercomplex ' 1 0scale2refiw:ow/mdar 2nd ref ref 2ndvstack vid' -map vid -c:v libx264 -crf 23 -preset veryfast output.mp4 The vstack output pad hasn't been labelled, so the map won't refer to anything. I have tried numerous combinations but I can only add the logo over the first input video, but not over any position in the available space of the montage/composition. i: kps keypointsi plt.autoscale(False) for l in range(len(kplines)). The intended audience is browser engineers and performance-minded frontend developers. Hi all, I am having problems trying to add a logo on a vstack/hstack composition using ffmpeg. width / 2)) patch np.array(bbox).transpose() patch np.vstack((patch. In this doc, we look at the scrolling of CNET, input latency on CNET, some very interesting challenges on the responsive, and infinite scroll on Google Play’s desktop site. Questions and insights for the rendering engine (Blink).Illustrated diagnoses for the poor performance. ![]() So, keeping in mind that you can have a fixed size for the videos, we will proceed with the following task that will be resizing both videos to a common size. I’ve written up case study documents for each, incorporating all the findings: FFmpeg offers the hstack filter to stack horizontally the videos, the only requirement is that both videos need to have the same dimensions (height and width). Using the 1000/100/6 performance model 1, and spelunking deep into each app, the findings have been fascinating. Recently, I’ve spent some time recently profiling real-world mobile websites.
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