Fwd: Text on ffmpeg
willemferguson at zoology.up.ac.za
Wed Sep 12 04:49:28 PDT 2018
On 12/09/2018 12:44, Willem Ferguson wrote:
> ---------- Forwarded message ---------
> From: *Berthold Stoeger* <bstoeger at mail.tuwien.ac.at
> <mailto:bstoeger at mail.tuwien.ac.at>>
> Date: Tue, 11 Sep 2018, 22:37
> Subject: Text on ffmpeg
> To: <fergusonwillem at gmail.com <mailto:fergusonwillem at gmail.com>>
> Hi Willem,
> I wrote a few lines on ffmpeg/thumbnail extraction:
> By default, videos are shown on the profile and the _Media_ tab with a
> To extract real thumbnails from videos, _Subsurface_ relies on the
> external _FFmpeg_ software.
> This software can be downloaded from
> <https://www.ffmpeg.org/download.html%5BFFmpeg> download page].
> Most Linux distributions ship with an _FFmpeg_ package and therefore
> do not need an additional download.
> There are two ways of connecting _Subsurface_ to _FFmpeg_:
> 1) On Windows, put the _ffmpeg.exe_ file in the directory containing
> the _Subsurface_ executable.
> On Mac and Linux, make sure the _ffmpeg_ command is in the path. This
> should be the case for
> _ffmpeg_ installed from official packages.
> 2) In the _General_ tab of the _Preferences_, choose the path to the
> To enable thumbnail extraction from videos, check the _Extract video
> thumbnails_ box
> in the _General_ tab of the _Preferences_. If _Subsurface_ fails to
> load the _FFmpeg_ executable,
> this option will be turned off. Re-enable it after succesfully
> installing _FFmpeg_.
> In the _General_ tab of the _Preferences_, you can also choose the
> position in the video where _Subsurface_
> should try to extract the thumbnail. The left-most and right-most
> positions of the _Extract at position_
> slider signify the beginning and the end of the video, respectively.
> Note that if _Subsurface_ cannot
> determine the length of the video (this can be the case for AVI
> files), the first frame
> of the video will be extracted.
> Is this kind of text useful for you? Should I make screenshots?
Looks like our normal email is working again. Thanks for the above. That
is certainly very useful and I tested it on my Linux box. One question.
The date/time that is used to insert the video: are there any Exif or
equivalent data in the file from which this is obtained, or does it use
the file system date/time? My video viewer does not produce any
date/time incoded in the ,mp4 itself.
Second question. I have several .MOV files in the same directory as the
.mp4 file that I work with. When, in Subsurface, I select "Attach images
from file" and I point it to the right directory, and select "Video
files" it only sees the .mp4 file, NOT the .MOV files. The file filter
that determines which files are seen must be set by the Subsurface
importer. However, when I select the "All files" filter, then it sees
the .MOV files. So, it appears the filter for "Video files" could be
improved to include the formats that ffmpeg supports????
Thirdly, it is a rudimentary issue to update the dive list context menu
entry to read "Load Images from file" to "Load media from file". The
same should probably happen to the menu entry immediately underneath
"Load images from web". Should I do that?
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