[FFmpeg-user] V360 stabilization

[Paul B Mahol]

On 11/3/22, Michael Koch <astroelectronic at t-online.de> wrote:
> Am 03.11.2022 um 09:35 schrieb Paul B Mahol:
>> On 10/11/20, Michael Koch <astroelectronic at 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.