ffmpeg -i progname.ts -c:av copy progname.mp4
Very early in the morning here, so I'll be laconic for now :-)
Assuming you've not mistyped it,
-c:av copy
is not valid and probably the reason your command
is initiating video+audio transcoding... Try
ffmpeg -i progname.ts -c copy progname.mp4
and see how that fares...
-c copy =
-vcodec copy -acodec copy
or
-c:v copy -c:a copy
or
-codec: copy
or
-codec copy
https://ffmpeg.org/ffmpeg.html#toc-Stream-copy
https://ffmpeg.org/ffmpeg.html#toc-Stream-specifiers-1
According to
https://en.wikipedia.org/wiki/Comparison_of_video_container_formats
the MP4 container should be able to support both
https://en.wikipedia.org/wiki/H.262/MPEG-2_Part_2 (video)
and
https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_II (audio)
raw streams, playing back such a file in a HW/SW player
is another matter, though (most expect h264+aac).
The question is, why must you use the MP4 container in your NAS?
V.
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