Media option: Save dive data as subtitles.

[Willem Ferguson]

I share your point of view because I am an old style underwater still
photographer. But every second diver has a Gopro these days and if any of
them use Subsurface the facility is probably useful. If I were a
videographer I would probably use this option.

On Fri, 24 Sep 2021, 17:47 Dirk Hohndel via subsurface, <
subsurface at subsurface-divelog.org> wrote:

>
>
> On Sep 24, 2021, at 5:08 AM, Willem Ferguson via subsurface <
> subsurface at subsurface-divelog.org> wrote:
>
> When right-clicking on a photo in the Subsurface Media tab on my desktop I
> just came across the option "Save dive data as subtitles". What does this
> do? I would like to include this in the user manual.
>
>
> Well, here's what the manual says today...
>
> *By right-clicking on a video and selecting the "Save dive data as
> subtitles" option, a subtitles*
> *file with the same name as the video but with an ".ass" extension is
> created that contains*
> *time dependent dive data (runtime, depth, temperature, NDL, TTS, surface
> GF) to be overlayed*
> *with the video. The VLC video player automatically finds this file upon
> playing the video*
> *and overlays the dive data. Alternatively, the ffmpeg video encoder can
> be used to create a*
> *new video file with the dive data encoded in the video stream. To do so
> run*
>
> *        ffmpeg -v video.mp4 -vf "ass=video.ass" video_with_data.mp4*
>
> *from the command line. You need to have the libass library installed.*
>
>
>
> This is the classic example of a feature that one or two people wanted,
> one person implemented, and that no one uses or knows about.
> I'm tempted to make a bet whether this actually works - or whether this
> works on a platform different from the one the implementer uses...
>
> Well, this feature was added by Robert
>
> commit 52105e521720c87e64dbd2519be7bbe5dc243439
> Author: Robert C. Helling <helling at atdotde.de>
> Date:   Sun Apr 14 16:19:23 2019 +0200
>
>     Write dive data as video subtitles
>
>     This commit adds an entry to the dive media context
>     menu which offers to write a subtitle file. This
>     creates an .ass file for the selected videos.
>
>     In an attempt to to clutter the screen too much, don't
>     show irrelevant entries (zero temperature or
>     NDL and show TTS only for dives with stops).
>
>     VLC is able to show these subtitles directly, they
>     can be integrated into the video file with ffmpeg.
>
>     Signed-off-by: Robert C. Helling <helling at atdotde.de>
>
> So my guess is this works on macOS, this may work on Linux, this is
> unlikely to have ever been tested on Windows.
>
> /D
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