Media option: Save dive data as subtitles.

[Dirk Hohndel]

> 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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