On Thu Sep 7 22:19:48 BST 2017, RS wrote:
As far as I am aware
all the variants Vangelis suggested work.
Yes they do, with fairly recent FFmpeg versions
that are also backward compatible...
However, the GiP perl script must cater for a variety
of OSes and in the case of Linux distros some (still)
come by default with older FFmpeg packages;
the more recent
-c:v copy -c:a copy
syntax/iteration isn't recognised by those older FFmpeg versions,
so issuing "--ffmpeg-obsolete" in your terminal ("ffmpegobsolete 1"
inside options) will revert to the legacy syntax; from help:
--ffmpeg-obsolete
Indicates you are using an obsolete version of ffmpeg (<1.0)
that may not support certain options.
Without this option, MP4 conversion may fail
with obsolete versions of ffmpeg.
As hinted, "--ffmpeg-obsolete" also takes care of some
other ffmpeg switches (e.g. verbosity level), browse the
actual code and ye shall find...
Many greetings,
Vangelis.
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