Compiling on aarch64?

[pchristy]

OK, I appreciate this is an odd one! I've been using avidemux for ages on x86(_64) systems, but for Xmas my son bought me a Pi 400 to play with.

I've install Slarm64-current on it (an unofficial port of Slackware64-current) as Slackware64-current is my main OS.

I've managed to compile ffmpeg, vlc and kaffeine on it, but have an odd problem with avidemux: I can't output mpeg-ps streams! It tells me the muxer is not available, although it is in the drop down menus.

Initially, I had the same problem with matroska and mpeg-ts, which I got around by installing libmatroska and libdvbpsi. There must be a library I'm missing to enable mpeg-ps, but I can't figure out what it is!

Libmpeg2 is perhaps a possibility, but it doesn't seem to have been updated in years, and won't compile on aarch64. From the documentation, that only appears to be a codec rather than a (de-)muxer anyway - unless someone can tell me different?

The thing is that my ffmpeg compilation has no problems outputting mpeg-ps files, so I am at a loss as to why avidemux cannot.

Any pointers gratefully received!

--
Pete

[eumagga0x2a]

Are you building off the git master?

Initially, I had the same problem with matroska and mpeg-ts, which I got around by installing libmatroska and libdvbpsi.

Neither of the two has any relevance to Avidemux.

There must be a library I'm missing to enable mpeg-ps, but I can't figure out what it is!

The MPEG-PS muxer functionality is provided by the internal libavformat (a part of the FFmpeg bundled with Avidemux). Running Avidemux executable from the command line should reveal related errors.

[pchristy]

Sorry, should have said! No, not compiling from git, but from 2.7.8 release.

Yes, I thought avidemux used its own internal libavformat, which is why I was surprised when it failed when my own ffmpeg worked fine. I've never run into this on x86(_64) and am new to ARM, so still learning!

I'll have a go from the command line and see what it says...

[pchristy]

OK, think I've sussed the problem! It wasn't directly the mpeg-ps muxer, it didn't like the picture format being non-DVD compliant!

I'd recorded some stuff "off air" which came in as .ts files. Here in the UK, the lesser known channels try and save on bandwidth by using a low horizontal resolution - typically 544x576 instead of the more usual 720 or 704x576 - even though the aspect ratio is still 16x9!

Yes, I know, yuch!

Once I made a test recording of one of the main channels at normal resolution, everything worked!

But as a bonus, my slackbuild script - with a minor tweak for aarch64 - has produced a fully working avidemux on the Pi 400!

 

Mea culpa! Sorry for the "noise! 

[eumagga0x2a]

Glad it works for you now. No problem with "noise", but quoting the actual error message instead of

I can't output mpeg-ps streams! It tells me the muxer is not available

would have allowed to assess the problem on the spot :-)

not compiling from git, but from 2.7.8 release.

As always, the current git has fixes for a couple of issues which were discovered only post-release (nothing even near as grave as in 2.7.6, but still). Additionally, it offers a whole lot of new filters contributed by szlldm.

[pchristy]

Noted! 

I'm not sat in front of it at the moment, but as I recall, when I tried to save a file with the mpeg-ps muxer selected, it simply opened a box which contained the phrase "Muxer not available".

Anyway, all sorted now, and thanks again!