https://bugs.kde.org/show_bug.cgi?id=484376
Bug ID: 484376
Summary: Add option for waveform generation to be on demand
Classification: Applications
Product: subtitlecomposer
Version: 0.7.1
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: max...@smoothware.net
Reporter: kos...@nomail.gr
Target Milestone: ---
I (and I believe many others) have my videos kept in a storage server. In this
way, I can keep more videos than my laptop's storage allows. When I'm not at
home, I have access to them using an sshfs setup. This works pretty well, as
long as the connection to my home is both efficient and stable.
On many occasions, I use Subtitle Composer to make small changes to .srt files
in order to watch a video, and I don't need to use waveform feature. In other,
rare cases, the changes needed are demanding, so the waveform is very useful.
When connecting through internet, just opening a subtitle file introduces great
delays and huge network traffic (often paid to mobile network providers),
because SC is automatically fetching the audio data in order to generate the
waveform. This unnecessary behavior may also be present when opening local
files on old/slow devices (due to CPU/RAM overload, in those cases). Remember:
to show some parts of the video only those parts (and maybe an overhead) are
fetched, while the waveform generation needs the whole audio data.
Until now, the workaround for me was to disable auto-loading of the video
altogether, which is painful as it forces you to search and open the video file
when needed, thus inserts a whole additional procedure. In addition, the delays
caused by waveform generation come back if you really need to load the video,
even when the waveform is useless at that time.
I believe that there should be an option in application's configuration, inside
the "Waveform" tab, named something like "Automatically generate waveform when
opening a subtitle", with the default value set to "On". When this is disabled
by the user, on loading the video the waveform widget should be empty with
nothing displayed except for a big button named "Generate waveform".
P.S.: I cannot decide whether this is a bug (as it creates great delays) or an
enhancement (as it reduces productivity).
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