[FFmpeg-user] V360 stabilization

[Michael Koch]

Am 03.11.2022 um 10:10 schrieb 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?

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