[Libav-user] How to Use FFmpeg Decode Libraries

Thu Sep 13 04:11:34 CEST 2012

I have resolved this issue now. I need add PKG_CONFIG_PATH in environment variable. After do this, I can build the test example successfully.
 Thanks for your kindly help.

 ------------------ Original ------------------
  From:  "Myth"<286166657 at qq.com>;
 Date:  Thu, Sep 13, 2012 10:00 AM
 To:  "This list is about using libavcodec, libavformat, libavutil,libavdevice and libavfilter."<libav-user at ffmpeg.org>; 

 Subject:  Re: [Libav-user] How to Use FFmpeg Decode Libraries

 Below is my build procedure:
 #cd ffmpeg
 #./configure --arch=x86 --target-os=linux 
 #make
 #make install
 #cd doc/examples/
 #make
 Then there are some error occurs. Following is the error log:
 Package libswresample was not found in the pkg-config search path.
Perhaps you should add the directory containing `libswresample.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libswresample' found
Package libswresample was not found in the pkg-config search path.
Perhaps you should add the directory containing `libswresample.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libswresample' found
cc   decoding_encoding.o    -lm -o decoding_encoding
decoding_encoding.o: In function `video_encode_example':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:342: undefined reference to `avcodec_find_encoder'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:348: undefined reference to `avcodec_alloc_context3'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:365: undefined reference to `avcodec_open2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:376: undefined reference to `avcodec_alloc_frame'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:387: undefined reference to `av_image_alloc'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:396: undefined reference to `av_init_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:420: undefined reference to `avcodec_encode_video2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:437: undefined reference to `avcodec_encode_video2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:454: undefined reference to `avcodec_close'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:455: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:456: undefined reference to `av_freep'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:457: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:429: undefined reference to `av_free_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:446: undefined reference to `av_free_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:362: undefined reference to `av_opt_set'
decoding_encoding.o: In function `audio_decode_example':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:243: undefined reference to `av_init_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:248: undefined reference to `avcodec_find_decoder'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:254: undefined reference to `avcodec_alloc_context3'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:257: undefined reference to `avcodec_open2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:286: undefined reference to `avcodec_get_frame_defaults'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:288: undefined reference to `avcodec_decode_audio4'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:295: undefined reference to `av_samples_get_buffer_size'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:281: undefined reference to `avcodec_alloc_frame'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:321: undefined reference to `avcodec_close'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:322: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:323: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:269: undefined reference to `av_free'
decoding_encoding.o: In function `video_decode_example':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:489: undefined reference to `av_init_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:497: undefined reference to `avcodec_find_decoder'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:503: undefined reference to `avcodec_alloc_context3'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:512: undefined reference to `avcodec_open2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:525: undefined reference to `avcodec_alloc_frame'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:554: undefined reference to `avcodec_decode_video2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:580: undefined reference to `avcodec_decode_video2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:595: undefined reference to `avcodec_close'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:596: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:597: undefined reference to `av_free'
decoding_encoding.o: In function `main':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:606: undefined reference to `avcodec_register_all'
decoding_encoding.o: In function `audio_encode_example':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:117: undefined reference to `avcodec_find_encoder'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:123: undefined reference to `avcodec_alloc_context3'
decoding_encoding.o: In function `select_channel_layout':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:88: undefined reference to `av_get_channel_layout_nb_channels'
decoding_encoding.o: In function `audio_encode_example':
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:139: undefined reference to `av_get_channel_layout_nb_channels'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:142: undefined reference to `avcodec_open2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:154: undefined reference to `avcodec_alloc_frame'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:166: undefined reference to `av_samples_get_buffer_size'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:168: undefined reference to `av_malloc'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:175: undefined reference to `avcodec_fill_audio_frame'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:186: undefined reference to `av_init_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:198: undefined reference to `avcodec_encode_audio2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:211: undefined reference to `avcodec_encode_audio2'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:224: undefined reference to `av_freep'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:225: undefined reference to `av_freep'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:226: undefined reference to `avcodec_close'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:227: undefined reference to `av_free'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:205: undefined reference to `av_free_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:219: undefined reference to `av_free_packet'
/work/marvell_project/p-cat/benchmarks/ffmpeg/doc/examples/decoding_encoding.c:131: undefined reference to `av_get_sample_fmt_name'
collect2: ld returned 1 exit status
make: *** [decoding_encoding] Error 1

 Can you tell me the right build procedure?

 Thanks and Regards,
 Stefan

 ------------------ Original ------------------
  From:  "Carl Eugen Hoyos"<cehoyos at ag.or.at>;
 Date:  Wed, Sep 12, 2012 07:02 PM
 To:  "libav-user"<libav-user at ffmpeg.org>; 

 Subject:  Re: [Libav-user] How to Use FFmpeg Decode Libraries

Myth <286166657 at ...> writes:

> I have downloaded the latest FFmepg source code. 
> I faced a new question, I don't know how to build 
> the test examples located in doc/examples/

$ make
?
(It seems to me you have to install FFmpeg first.)

Carl Eugen

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