[digikam] [Bug 374799] New: Feature request - ability to convert video files

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https://bugs.kde.org/show_bug.cgi?id=374799

            Bug ID: 374799
           Summary: Feature request - ability to convert video files
           Product: digikam
           Version: 5.3.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: BatchQueueManager
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

Some of my older video files recorded with a digital camera are .MOV files
containing Motion JPEGs with audio. I would like the ability for digiKam to
convert these to a different format, say AVI, MP4 etc.

Preferably video file conversion should be possible with the batch tool.

One of my reason for this feature is that uploading old MOV files to Google
Photos causes them to get today's timestamp. This may be caused by the lack of
metadata / timestamps in the original .mov files.

I would like to see digikam be able to call FFMPEG or some other tool with
appropriate parameters to convert video files.

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--- Comment #1 from [hidden email] ---
With the new QtAv dependency to handle video files in digiKam introduced with
DK 5.4.0, we are able to re-encode easily video file, through ffmpeg in
background.

So it's planed...

Gilles Caulier

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--- Comment #2 from [hidden email] ---
The question is : i'm not sure if BQM is the right place for a king of
conversion of video file.

BQM is dedicated to process a queue a image files. It's different approach. The
subject is open...

Gilles Caulier

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--- Comment #3 from Roger Foss <[hidden email]> ---
Well, my take on this is if you want to convert video files, you will probably
want to do it repeatedly, to batches of files. Hence, the BQM.  Also once
that's implemented, I can imagine applying other base tools to videos. Ie. amp
up the brightness, add some metadata, enhance contrast.  I could see the some
of the same base tools apply to video.

I shall not get too far ahead: I know digikam is primarily a photo management
tool.  My point is this: why NOT the BQM?

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--- Comment #4 from wildcowboy <[hidden email]> ---
Here is the ffmpeg command I use to convert/compress video files. Works as a
charm.

ffmpeg -i in.mp4 -c:v libx264 -crf 23 -c:a libfaac -q:a 100 -map_metadata 0
out.mp4

This will convert the input with the x264 encoder and FAAC audio to an output
file, copying the original metadata. In order to change the quality of the
output, you can:
* Change the CRF value for video. Lower means better quality. 23 is default,
and anything below 18 will probably be visually lossless.
* Change the Q parameter for audio. Higher means better, and 100% is the
default.

Unknown encoder 'libfaac' error? Then your ffmpeg is not compiled with FAAC
support. Try " -c:a aac -strict experimental" instead.

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--- Comment #5 from wildcowboy <[hidden email]> ---
Also, if you want to copy metadata from one video file to another you can use
this command:

ffmpeg -i in.mp4 -i out.mp4 -map 1 -map_metadata 0 -c copy fixed.mp4

in.mp4 – the original file before conversion
out.mp4 – the file after Handbrake conversion
fixed.mp4 – the file with "corrected" metadata

Take two input files (in.mp4 and out.mp4), which are assigned the IDs 0 and 1,
respectively.
* Map only the video/audio/subtitle streams from file 1 to the output (-map 1),
so we take the bitstreams that are already converted
* Map only the metadata from file 0 to the output (-map_metadata 0)
* Use the copy codec (-c copy) to copy all the bitstreams instead of
re-encoding the video.

After that, you could obviously rename fixed.mp4 to out.mp4.

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