Am 03.11.2022 um 10:10 schrieb Paul B Mahol:
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?
You are right, it is supported now. But my first test to convert a
16-bit grayscale SER file to MP4 failed. I will provide a short sample
file later. At the moment I only have SER files that are too big for
uploading.
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?
Perhaps these features weren't supported at the time when I wrote that,
but they are supported now.
All three issues are already corrected in the book and an updated
version is online.
Michael
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