Compilation errors about dvbcut-qt4 HOT 9 CLOSED

FFmpeg documentation says that avformat_alloc_output_context2() should be available since version 0.7. If the libavformat devel package in Ubuntu doesn't provide that symbol, the package is broken and you should report that to your distro maintainers. In the mean time, you can link Dvbcut against legacy FFmpeg which is included with the sources. You'll either have to uninstall libavcodec-dev or comment out the pkg-config check for libavcodec in src/src.pro on line 12 and re-run qmake.

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Now I get:

../ffmpeg/lib/libavcodec.a(h263.o): In function h263_decode_picture_header': h263.c:(.text+0x18c95): undefined reference toff_gcd'
../ffmpeg/lib/libavcodec.a(mpegvideo.o): In function MPV_encode_init': mpegvideo.c:(.text+0x4ff0): undefined reference toff_gcd'
collect2: ld returned 1 exit status

Seems the included ffmpeg doesn't build?

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ff_gcd() should be part of ffmpeg/lib/libavutil.a (implemented in ffmpeg.src/libavutil/mathematics.c), did this file build correctly? If not, I need the error message from FFmpeg compilation.

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../ffmpeg/lib/libavcodec.a(h263.o):-1: In function `h263_decode_picture_header':
File not found: ../ffmpeg/lib/libavcodec.a(h263.o)

But libavcodec.a got build in ffmpeg/lib:
$ file ffmpeg/lib/libavcodec.a
ffmpeg/lib/libavcodec.a: current ar archive

And there is also ./ffmpeg.src/libavutil/mathematics.o

$ strings ffmpeg/lib/libavcodec.a | grep ff_gcd
ff_gcd
ff_gcd

Maybe it's something about the relative path?

from dvbcut-qt4.

I think you should send me a complete build log. I can't figure out what's wrong from so little information.

from dvbcut-qt4.

Sorry …

This is the full compile output after I did a fresh git clone: https://gist.github.com/michaelkanis/5952497

And thanks for your help!

from dvbcut-qt4.

Let me guess, you have a copy of libavutil.so in /usr/lib/x86_64-linux-gnu/? You'll have to edit src/Makefile, find the line which defines the LIBS variable and move the text -L/usr/lib/x86_64-linux-gnu after -lavutil. I can't do this through the project file because I don't have full control over library order. QMake apparently always places the Qt libs directory first. Dvbcut should finally build after this change.

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Indeed. I found it easier to temporarily rename libavutil.so and libavutil.a in /usr/lib/x86_64-linux-gnu/ and it built successfully. However, neither of this is very convenient when trying to make some changes to the source.

Thanks again for your help though!

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Well, your distro maintainers managed to make this much more painful than it needs to be. First they provide a broken package which you need to work around and then make Qt4 libs install in the same directory as everything else (Gentoo for example has Qt libs in a separate subdirectory) which makes linking Qt programs against internal libs a huge pain in the ass. You should report both as a bug.

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