Why is opencv package compiled without ffmpeg backend support ?

hl037 · 2018-10-18 12:49:13

Why is opencv official package compiled without ffmpeg backend support ?

This is what I was wondering. Since I have generally specific needs with opencv, I usually always create my own package (including contribs).
However, today, I need opencv on a small server, and I have a really poor connection, so impossible to compile it remotely, neither is it possible to upload the package (60Mo... at 1K/s upload...)

So, I tried the official package. And then, Watching the build info :

Video I/O:
    FFMPEG:                      NO
      avcodec:                   NO
      avformat:                  NO
      avutil:                    NO
      swscale:                   NO
      avresample:                NO

...And that really surprised me, because ffmpeg is quite widely used (and personnally, I always have problems with gst... [maybe a biased opinion]). So I was wondering why isn't it supported ?

I may be wrong, but I think it could be an optionnal depency (then, it would not add a huge overhead, while still possible to be used with GST) ?

Last edited by hl037 (2018-10-18 12:50:58)

Lone_Wolf · 2018-10-18 13:05:05

Looks like it was changed here : https://git.archlinux.org/svntogit/pack … 85e773078e .

Very few developers use forum , but you may be lucky as Arojas (opencv maintainer and last packager) does.

Trilby · 2018-10-18 13:38:30

hl037 wrote:

I have a really poor connection, so impossible to compile it remotely

This doesn't follow. Why does having a poor connection make it hard to start a compilation process on the server?

ugjka · 2018-10-18 14:57:27

Trilby wrote:

hl037 wrote:
I have a really poor connection, so impossible to compile it remotely
This doesn't follow. Why does having a poor connection make it hard to start a compilation process on the server?

he doesn't know tmux or screen or mosh?

ngoonee · 2018-10-19 02:08:43

Trilby wrote:

hl037 wrote:
I have a really poor connection, so impossible to compile it remotely
This doesn't follow. Why does having a poor connection make it hard to start a compilation process on the server?

If 'small server' refers to one of those boards (Pi etc) then it may just take too long.

Though I agree that it's more likely he's referring to a finicky connection and doesn't (yet) know the wonders of tmux/screen.

Trilby · 2018-10-19 02:38:15

Suggesting that there might be an other reason why building on the server could be impractical doesn't affect the claim that not being able to build does not follow from a bad connection.

hl037, set up screen/tmux to reconnect to an existing session upon reconnect, then just sign in and start makepkg.

Arch Linux

#1 2018-10-18 12:49:13

Why is opencv package compiled without ffmpeg backend support ?

#2 2018-10-18 13:05:05

Re: Why is opencv package compiled without ffmpeg backend support ?

#3 2018-10-18 13:38:30

Re: Why is opencv package compiled without ffmpeg backend support ?

#4 2018-10-18 14:57:27

Re: Why is opencv package compiled without ffmpeg backend support ?

#5 2018-10-19 02:08:43

Re: Why is opencv package compiled without ffmpeg backend support ?

#6 2018-10-19 02:38:15

Re: Why is opencv package compiled without ffmpeg backend support ?

Board footer