On 11/3/22, Michael Koch <astroelectro...@t-online.de> wrote: > Am 03.11.2022 um 09:35 schrieb Paul B Mahol: >> On 10/11/20, Michael Koch <astroelectro...@t-online.de> wrote: >>> Am 29.09.2020 um 22:54 schrieb Michael Koch: >>>> Hello all, >>>> >>>> I've programmed a C# workaround for stabilization of 360° videos. The >>>> procedure is as follows: >>>> >>>> 1. FFmpeg: From each frame of the equirectangular input video, extract >>>> two small images which are 90° apart in the input video. I call them A >>>> and B images. >>>> >>>> 2. C# code: Analyze the x and y image shift from subsequent A and B >>>> images. Calculate how the equirectangular frames must be rotated (yaw, >>>> pitch, roll) to compensate the image shifts. This part wasn't easy. >>>> Two rotation matrices and one matrix multiplication are required. >>>> Write the results to a *.cmd file. >>>> >>>> 3. FFmpeg: Read the *.cmd file and apply the rotations with the v360 >>>> filter. The output video is stabilized. >>>> >>>> For details and source code please have a look at chapter 2.78 in my >>>> book: >>>> http://www.astro-electronic.de/FFmpeg_Book.pdf >>>> >>>> If anyone wants to implement this in FFmpeg, please feel free to do it. >>> I've written and tested an improved version for 360° stabilization, it's >>> in chapter 2.79. >> Your book is full or factual errors, >> >> Notice to anyone: do not use this thing for anything serious. > > Thank you for so much promotion for my book. > Sure, it's likely that in more than 900 pages there are a few errors. We > all make errors. If anyone finds an error, please let me know. You find > my e-mail address on the first page. > > http://www.astro-loltronic.de/FFmpeg_Book.pdf
Some things in sea of myriad others: Why you claim that FFmpeg does not have SER format support while in fact it have support for it? Why you claim that datascope does not support >8 bit formats where in fact it does support it? Why you claim that drawbox does not support RGB formats while in fact it does support them? I think this is enough, I could continue this forever. I could bet there is at least one and sometimes even much more factual errors on every single page of this book that mentions FFmpeg directly or indirectly. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
