[Libav-user] Setting up ffmpeg avcodec wiht Qt Linux undefined reference
Hi,
im trying to get the example from
https://www.ffmpeg.org/doxygen/trunk/decode_video_8c-example.html running.
Im using Qt Creator (C++) with Widgets and compiled ffmpeg manually (Kubuntu
18.04.0 64 bit).
Unfortunately im getting "undefined reference" errors for every avcodec
function (e.g. avcodec_send_packet
https://www.ffmpeg.org/doxygen/trunk/group__lavc__decoding.html#ga58bc4bf1e0ac59e27362597e467efff3
(dec_ctx, pkt) ...)
I added headers and libs in the qmake file with:
INCLUDEPATH += /home/user/ffmpeg_build/include
LIBS += /home/user/ffmpeg_build/lib/libavcodec.a
I have tried:
extern "C" {
#include
}
without success.
I attached a file with the "undefined reference" errors.
Kind Regards
undefined_ref_log
Description: Binary data
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Re: [Libav-user] Setting up ffmpeg avcodec wiht Qt Linux undefined reference
2018-04-30 16:47 GMT+02:00, buff...@mailbox.org : > im trying to get the example from > https://www.ffmpeg.org/doxygen/trunk/decode_video_8c-example.html > running. Did you test the following? $ make doc/examples/decode_video Carl Eugen ___ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user
Re: [Libav-user] Setting up ffmpeg avcodec wiht Qt Linux undefined reference
Ok,
"$ make doc/examples/decode_video"
compiled successfully.
The following version of gcc is currently installed:
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
Using:
extern "C" {
#include
}
as mentioned in my first email leads to another error:
/usr/bin/x86_64-linux-gnu-ld:
/home/user/ffmpeg_build/lib//libavcodec.a(flashsv.o): undefined reference to
symbol 'inflateEnd'
Makefile:252: recipe for target 'FFmpegDev' failed
//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from
command line
collect2: error: ld returned 1 exit status
make: *** [FFmpegDev] Error 1
13:52:06: The process "/usr/bin/make" exited with code 2.
Is this information useful?
Greetings
> Carl Eugen Hoyos hat am 30. April 2018 um 20:00
> geschrieben:
>
>
> 2018-04-30 16:47 GMT+02:00, buff...@mailbox.org :
>
> > im trying to get the example from
> > https://www.ffmpeg.org/doxygen/trunk/decode_video_8c-example.html
> > running.
>
> Did you test the following?
> $ make doc/examples/decode_video
>
> Carl Eugen
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Re: [Libav-user] Setting up ffmpeg avcodec wiht Qt Linux undefined reference
2018-05-01 14:18 GMT+02:00, buff...@mailbox.org : > /usr/bin/x86_64-linux-gnu-ld: > /home/user/ffmpeg_build/lib//libavcodec.a(flashsv.o): > undefined reference to symbol 'inflateEnd' "-lz" does not follow "-lavcodec" in the linking command. (This is not an FFmpeg-related question.) Please remember not to top-post here, Carl Eugen ___ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user
Re: [Libav-user] Setting up ffmpeg avcodec wiht Qt Linux undefined reference
On 05/01/2018 08:18 AM, buff...@mailbox.org wrote:
Ok,
"$ make doc/examples/decode_video"
compiled successfully.
The following version of gcc is currently installed:
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
Using:
extern "C" {
#include
}
as mentioned in my first email leads to another error:
/usr/bin/x86_64-linux-gnu-ld:
/home/user/ffmpeg_build/lib//libavcodec.a(flashsv.o): undefined reference to
symbol 'inflateEnd'
Makefile:252: recipe for target 'FFmpegDev' failed
//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from
command line
collect2: error: ld returned 1 exit status
make: *** [FFmpegDev] Error 1
13:52:06: The process "/usr/bin/make" exited with code 2.
Is this information useful?
Greetings
Carl Eugen Hoyos hat am 30. April 2018 um 20:00
geschrieben:
2018-04-30 16:47 GMT+02:00, buff...@mailbox.org :
im trying to get the example from
https://www.ffmpeg.org/doxygen/trunk/decode_video_8c-example.html
running.
Did you test the following?
$ make doc/examples/decode_video
Carl Eugen
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QT issue. add libavcodec/avcodec.h and others to your .pro file.
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