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• flutter : Getting width and height of video using

  2 mai 2019, par ebg11

  I am trying to retrieve the width and height of a video using flutter. I have tried using ffmpeg

  _flutterFFmpeg.getMediaInformation(file.path);

  but the width and height are occasionally flipped. I have noticed
  "rotate" -> "90" and "displaymatrix" -> "rotation of -90.00 degrees" are present in the meta data returned.

  Is there a bug free method of using the rotate/display matrix to determine the true width/height of the video or is there a better method/library that can help me here ?

  Thanks.

• Trouble linking own application using ffmpeg/libav

  2 mai 2019, par Kiamur

  I have a source, that I’d like to build and link against the libav library on Linux.
  I followed the compilation guide of ffmpeg here : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
  Everything works.
  I build the included examples like this : FFmpeg : building example C codes
  It also works.

  Now, I’d like to build my own little applications, where I try to learn about using libav. My current problem is, that by using the command line

  gcc muxing.c -g -I ../../../ffmpeg_build/include/ -L ../../../ffmpeg_build/lib/ -lavdevice -lavformat -lavfilter -lavcodec -lswresample -lswscale -lavutil -lm -lz -lpthread -lfdk-aac -lmp3lame -lx264 -lva -lX11

  I get to this point :

  muxing.c: In function ‘write_audio_frame’:
  
  muxing.c:354:5: warning: ‘avcodec_encode_audio2’ is deprecated [-Wdeprecated-declarations]
  
       ret = avcodec_encode_audio2(codecContext, &pkt, frame, &got_packet);
  
       ^~~
  
  In file included from ../../../ffmpeg_build/include/libavformat/avformat.h:317:0,
  
                   from muxing.c:42:
  
  ../../../ffmpeg_build/include/libavcodec/avcodec.h:5418:5: note: declared here
  
   int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
  
       ^~~~~~~~~~~~~~~~~~~~~
  
  muxing.c: In function ‘write_video_frame’:
  
  muxing.c:524:5: warning: ‘avcodec_encode_video2’ is deprecated [-Wdeprecated-declarations]
  
       ret = avcodec_encode_video2(codecContext, &pkt, frame, &got_packet);
  
       ^~~
  
  In file included from ../../../ffmpeg_build/include/libavformat/avformat.h:317:0,
  
                   from muxing.c:42:
  
  ../../../ffmpeg_build/include/libavcodec/avcodec.h:5457:5: note: declared here
  
   int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
  
       ^~~~~~~~~~~~~~~~~~~~~
  
  /usr/bin/ld: ../../../ffmpeg_build/lib//libx264.a(opencl-8.o): undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
  
  //lib/x86_64-linux-gnu/libdl.so.2: error adding symbols: DSO missing from command line
  
  collect2: error: ld returned 1 exit status

  Then I read, in order to overcome this linker error, I have to append -ldl to my command line, but then I get this :

  ../../../ffmpeg_build/lib//libavcodec.a(libopusdec.o): In function `libopus_flush':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:204: undefined reference to `opus_multistream_decoder_ctl'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusdec.o): In function `libopus_decode':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:169: undefined reference to `opus_multistream_decode_float'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:165: undefined reference to `opus_multistream_decode'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:174: undefined reference to `opus_strerror'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusdec.o): In function `libopus_decode_close':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:145: undefined reference to `opus_multistream_decoder_destroy'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusdec.o): In function `libopus_decode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:101: undefined reference to `opus_multistream_decoder_create'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:105: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:111: undefined reference to `opus_multistream_decoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:113: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:126: undefined reference to `opus_multistream_decoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusdec.c:129: undefined reference to `opus_strerror'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusenc.o): In function `libopus_encode':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:487: undefined reference to `opus_multistream_encode'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:483: undefined reference to `opus_multistream_encode_float'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:492: undefined reference to `opus_strerror'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusenc.o): In function `libopus_encode_close':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:530: undefined reference to `opus_multistream_encoder_destroy'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusenc.o): In function `libopus_encode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:348: undefined reference to `opus_multistream_encoder_create'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:358: undefined reference to `opus_multistream_surround_encoder_create'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:365: undefined reference to `opus_strerror'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusenc.o): In function `libopus_configure_encoder':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:121: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:123: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:128: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:131: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:134: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:136: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:139: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:142: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:145: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:148: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:153: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:156: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:161: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:164: undefined reference to `opus_strerror'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libopusenc.o): In function `libopus_encode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:410: undefined reference to `opus_multistream_encoder_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:412: undefined reference to `opus_strerror'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libopusenc.c:426: undefined reference to `opus_multistream_encoder_destroy'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisenc.o): In function `libvorbis_encode_frame':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:287: undefined reference to `vorbis_analysis_buffer'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:294: undefined reference to `vorbis_analysis_wrote'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:310: undefined reference to `vorbis_analysis_blockout'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:311: undefined reference to `vorbis_analysis'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:313: undefined reference to `vorbis_bitrate_addblock'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:317: undefined reference to `vorbis_bitrate_flushpacket'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:302: undefined reference to `vorbis_analysis_wrote'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisenc.o): In function `libvorbis_encode_close':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:180: undefined reference to `vorbis_analysis_wrote'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:182: undefined reference to `vorbis_block_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:183: undefined reference to `vorbis_dsp_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:184: undefined reference to `vorbis_info_clear'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisenc.o): In function `libvorbis_encode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:203: undefined reference to `vorbis_info_init'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisenc.o): In function `libvorbis_setup':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:98: undefined reference to `vorbis_encode_setup_vbr'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:107: undefined reference to `vorbis_encode_setup_managed'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:114: undefined reference to `vorbis_encode_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:121: undefined reference to `vorbis_encode_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:127: undefined reference to `vorbis_encode_ctl'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:160: undefined reference to `vorbis_encode_setup_init'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisenc.o): In function `libvorbis_encode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:208: undefined reference to `vorbis_analysis_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:214: undefined reference to `vorbis_block_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:220: undefined reference to `vorbis_comment_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:222: undefined reference to `vorbis_comment_add_tag'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:224: undefined reference to `vorbis_analysis_headerout'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisenc.c:257: undefined reference to `vorbis_comment_clear'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `decode_frame':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:161: undefined reference to `vpx_codec_decode'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vpx_decode':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:221: undefined reference to `vpx_codec_get_frame'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `decode_frame':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:162: undefined reference to `vpx_codec_error'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:163: undefined reference to `vpx_codec_error_detail'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:161: undefined reference to `vpx_codec_decode'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:162: undefined reference to `vpx_codec_error'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vpx_decode':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:222: undefined reference to `vpx_codec_get_frame'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:201: undefined reference to `vpx_codec_vp9_dx_algo'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:201: undefined reference to `vpx_codec_vp8_dx_algo'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vpx_free':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:269: undefined reference to `vpx_codec_destroy'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:271: undefined reference to `vpx_codec_destroy'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vpx_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:53: undefined reference to `vpx_codec_version_str'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:54: undefined reference to `vpx_codec_build_config'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:56: undefined reference to `vpx_codec_dec_init_ver'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:59: undefined reference to `vpx_codec_error'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vp8_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:278: undefined reference to `vpx_codec_vp8_dx_algo'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxdec.o): In function `vp9_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxdec.c:298: undefined reference to `vpx_codec_vp9_dx_algo'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `vpx_encode':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:1118: undefined reference to `vpx_codec_encode'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:1126: undefined reference to `vpx_codec_encode'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `queue_frames':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:979: undefined reference to `vpx_codec_get_cx_data'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:981: undefined reference to `vpx_codec_get_cx_data'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `log_encoder_error':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:164: undefined reference to `vpx_codec_error'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:165: undefined reference to `vpx_codec_error_detail'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `codecctl_int':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:298: undefined reference to `vpx_codec_control_'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `vpx_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:524: undefined reference to `vpx_codec_get_caps'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:527: undefined reference to `vpx_codec_version_str'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:528: undefined reference to `vpx_codec_build_config'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:533: undefined reference to `vpx_codec_enc_config_default'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:534: undefined reference to `vpx_codec_err_to_string'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:719: undefined reference to `vpx_codec_enc_init_ver'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:727: undefined reference to `vpx_codec_enc_init_ver'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:812: undefined reference to `vpx_img_wrap'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:820: undefined reference to `vpx_img_wrap'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `vp8_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:1279: undefined reference to `vpx_codec_vp8_cx'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `vp9_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:1309: undefined reference to `vpx_codec_vp9_cx'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `codecctl_intp':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:320: undefined reference to `vpx_codec_control_'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpxenc.o): In function `vpx_free':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:344: undefined reference to `vpx_codec_destroy'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpxenc.c:346: undefined reference to `vpx_codec_destroy'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libx265.o): In function `libx265_encode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libx265.c:84: undefined reference to `x265_api_get_173'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libx265.c:86: undefined reference to `x265_api_get_173'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libx265.o): In function `libx265_encode_init_csp':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libx265.c:494: undefined reference to `x265_api_get_173'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libx265.c:496: undefined reference to `x265_api_get_173'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libx265.c:498: undefined reference to `x265_api_get_173'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvpx.o): In function `ff_vp9_init_static':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpx.c:73: undefined reference to `vpx_codec_vp9_cx'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvpx.c:73: undefined reference to `vpx_codec_get_caps'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisdec.o): In function `oggvorbis_decode_close':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:191: undefined reference to `vorbis_block_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:192: undefined reference to `vorbis_dsp_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:193: undefined reference to `vorbis_info_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:194: undefined reference to `vorbis_comment_clear'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisdec.o): In function `oggvorbis_decode_frame':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:169: undefined reference to `vorbis_synthesis'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:175: undefined reference to `vorbis_synthesis_pcmout'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:179: undefined reference to `vorbis_synthesis_read'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:170: undefined reference to `vorbis_synthesis_blockin'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisdec.o): In function `oggvorbis_decode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:48: undefined reference to `vorbis_info_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:49: undefined reference to `vorbis_comment_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:97: undefined reference to `vorbis_synthesis_headerin'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisdec.o): In function `oggvorbis_decode_close':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:191: undefined reference to `vorbis_block_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:192: undefined reference to `vorbis_dsp_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:193: undefined reference to `vorbis_info_clear'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:194: undefined reference to `vorbis_comment_clear'
  
  ../../../ffmpeg_build/lib//libavcodec.a(libvorbisdec.o): In function `oggvorbis_decode_init':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:109: undefined reference to `vorbis_synthesis_init'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavcodec/libvorbisdec.c:110: undefined reference to `vorbis_block_init'
  
  ../../../ffmpeg_build/lib//libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:1490: undefined reference to `vaGetDisplay'
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:1514: undefined reference to `vaGetDisplayDRM'
  
  ../../../ffmpeg_build/lib//libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_derive':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:1561: undefined reference to `vaGetDisplayDRM'
  
  ../../../ffmpeg_build/lib//libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_create':
  
  /home/ritter/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:461: undefined reference to `vdp_device_create_x11'
  
  collect2: error: ld returned 1 exit status

  So, what can I do, to get it compiled and linked fully ?

• FFMPEG extracting 1 second resized with copy codec

  28 avril 2019, par boblapointe

  How can I extract 1 second ( using fast seek ) from a video, resize it, using vp9 ? I always get the same errors. Here are the bare bone commands I’m trying :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -filter:v "scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease" -c:v libvpx-vp9 -y output.webm

  It returns :

  "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  After playing around I realize that this will work :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -c copy -y output.webm

  Not ideal but at least it works, so I add the filter :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -filter:v "scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease" -c copy -y output.webm

  Ant then I get :

  "Filtering and streamcopy cannot be used together."

  I’ve tried all kinds of combinations, unsuccessfully. Any hint would be appreciated. Thank you

  ---

  Here is the full log of the first command :

      ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
        built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
        configuration : —prefix=/usr —extra-version=0ubuntu0.18.04.1 —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —enable-gpl —disable-stripping —enable-avresample —enable-avisynth —enable-gnutls —enable-ladspa —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librubberband —enable-librsvg —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzmq —enable-libzvbi —enable-omx —enable-openal —enable-opengl —enable-sdl2 —enable-libdc1394 —enable-libdrm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libopencv —enable-libx264 —enable-shared
        libavutil      55. 78.100 / 55. 78.100
        libavcodec     57.107.100 / 57.107.100
        libavformat    57. 83.100 / 57. 83.100
        libavdevice    57. 10.100 / 57. 10.100
        libavfilter     6.107.100 /  6.107.100
        libavresample   3.  7.  0 /  3.  7.  0
        libswscale      4.  8.100 /  4.  8.100
        libswresample   2.  9.100 /  2.  9.100
        libpostproc    54.  7.100 / 54.  7.100
      Splitting the commandline.
      Reading option ’-ss’ ... matched as option ’ss’ (set the start time offset) with argument ’00:00:10’.
      Reading option ’-i’ ... matched as input url with argument ’test.webm’.
      Reading option ’-to’ ... matched as option ’to’ (record or transcode stop time) with argument ’00:00:01’.
      Reading option ’-filter:v’ ... matched as option ’filter’ (set stream filtergraph) with argument ’scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease’.
      Reading option ’-c:v’ ... matched as option ’c’ (codec name) with argument ’libvpx-vp9’.
      Reading option ’-y’ ... matched as option ’y’ (overwrite output files) with argument ’1’.
      Reading option ’-v’ ... matched as option ’v’ (set logging level) with argument ’debug’.
      Reading option ’output.webm’ ... matched as output url.
      Finished splitting the commandline.
      Parsing a group of options : global .
      Applying option y (overwrite output files) with argument 1.
      Applying option v (set logging level) with argument debug.
      Successfully parsed a group of options.
      Parsing a group of options : input url test.webm.
      Applying option ss (set the start time offset) with argument 00:00:10.
      Successfully parsed a group of options.
      Opening an input file : test.webm.
      [NULL @ 0x55ce679f8920] Opening ’test.webm’ for reading
      [file @ 0x55ce679f9340] Setting default whitelist ’file,crypto’
      [matroska,webm @ 0x55ce679f8920] Format matroska,webm probed with size=2048 and score=100
      st:0 removing common factor 1000000 from timebase
      [matroska,webm @ 0x55ce679f8920] Before avformat_find_stream_info() pos : 566 bytes read:32768 seeks:0 nb_streams:1
      [matroska,webm @ 0x55ce679f8920] All info found
      [matroska,webm @ 0x55ce679f8920] After avformat_find_stream_info() pos : 72449 bytes read:72449 seeks:0 frames:1
      Input #0, matroska,webm, from ’test.webm’ :
        Metadata :
          ENCODER : Lavf57.83.100
        Duration : 00:00:15.03, start : 5.016000, bitrate : 1146 kb/s
          Stream #0:0(eng), 1, 1/1000 : Video : vp9 (Profile 0), 1 reference frame, yuv420p(tv), 1280x720, 0/1, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
          Metadata :
            DURATION : 00:00:15.025000000
      Successfully opened the file.
      Parsing a group of options : output url output.webm.
      Applying option to (record or transcode stop time) with argument 00:00:01.
      Applying option filter:v (set stream filtergraph) with argument scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease.
      Applying option c:v (codec name) with argument libvpx-vp9.
      Successfully parsed a group of options.
      Opening an output file : output.webm.
      [file @ 0x55ce67b1e820] Setting default whitelist ’file,crypto’
      Successfully opened the file.
      detected 8 logical cores
      Stream mapping :
        Stream #0:0 -> #0:0 (vp9 (native) -> vp9 (libvpx-vp9))
      Press [q] to stop, [?] for help
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 1 times
      [matroska,webm @ 0x55ce679f8920] first_dts 5016 not matching first dts 10395 (pts 10395, duration 41) in the queue
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 6 times
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’w’ to value ’min(iw,1280)’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’h’ to value ’min(ih,720)’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’force_original_aspect_ratio’ to value ’decrease’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’flags’ to value ’bicubic’
      [Parsed_scale_0 @ 0x55ce67a7c520] w:min(iw,1280) h:min(ih,720) flags :’bicubic’ interl:0
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’video_size’ to value ’1280x720’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’pix_fmt’ to value ’0’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’time_base’ to value ’1/1000’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’pixel_aspect’ to value ’1/1’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’sws_param’ to value ’flags=2’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’frame_rate’ to value ’24000/1001’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] w:1280 h:720 pixfmt:yuv420p tb:1/1000 fr:24000/1001 sar:1/1 sws_param:flags=2
      [format @ 0x55ce67ad7d60] compat : called with args=[yuv420p|yuva420p|yuv422p|yuv440p|yuv444p|gbrp]
      [format @ 0x55ce67ad7d60] Setting ’pix_fmts’ to value ’yuv420p|yuva420p|yuv422p|yuv440p|yuv444p|gbrp’
      [AVFilterGraph @ 0x55ce67aec740] query_formats : 6 queried, 5 merged, 0 already done, 0 delayed
      [Parsed_scale_0 @ 0x55ce67a7c520] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:1280 h:720 fmt:yuv420p sar:1/1 flags:0x4
      [libvpx-vp9 @ 0x55ce67b32200] v1.7.0
      [libvpx-vp9 @ 0x55ce67b32200] —prefix=/usr —enable-pic —enable-shared —disable-install-bins —disable-install-srcs —size-limit=16384x16384 —enable-postproc —enable-multi-res-encoding —enable-temporal-denoising —enable-vp9-temporal-denoising —enable-vp9-postproc —target=x86_64-linux-gcc
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_enc_cfg
      [libvpx-vp9 @ 0x55ce67b32200] generic settings
        g_usage :                      0
        g_threads :                    8
        g_profile :                    0
        g_w :                          320
        g_h :                          240
        g_bit_depth :                  8
        g_input_bit_depth :            8
        g_timebase :                   1/30
        g_error_resilient :            0
        g_pass :                       0
        g_lag_in_frames :              25
      [libvpx-vp9 @ 0x55ce67b32200] rate control settings
        rc_dropframe_thresh :          0
        rc_resize_allowed :            0
        rc_resize_up_thresh :          60
        rc_resize_down_thresh :        30
        rc_end_usage :                 0
        rc_twopass_stats_in :          (nil)(0)
        rc_target_bitrate :            256
      [libvpx-vp9 @ 0x55ce67b32200] quantizer settings
        rc_min_quantizer :             0
        rc_max_quantizer :             63
      [libvpx-vp9 @ 0x55ce67b32200] bitrate tolerance
        rc_undershoot_pct :            25
        rc_overshoot_pct :             25
      [libvpx-vp9 @ 0x55ce67b32200] decoder buffer model
        rc_buf_sz :                    6000
        rc_buf_initial_sz :            4000
        rc_buf_optimal_sz :            5000
      [libvpx-vp9 @ 0x55ce67b32200] 2 pass rate control settings
        rc_2pass_vbr_bias_pct :        50
        rc_2pass_vbr_minsection_pct :  0
        rc_2pass_vbr_maxsection_pct :  2000
      [libvpx-vp9 @ 0x55ce67b32200] keyframing settings
        kf_mode :                      1
        kf_min_dist :                  0
        kf_max_dist :                  128
      [libvpx-vp9 @ 0x55ce67b32200]
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_enc_cfg
      [libvpx-vp9 @ 0x55ce67b32200] generic settings
        g_usage :                      0
        g_threads :                    0
        g_profile :                    0
        g_w :                          1280
        g_h :                          720
        g_bit_depth :                  8
        g_input_bit_depth :            8
        g_timebase :                   1001/24000
        g_error_resilient :            0
        g_pass :                       0
        g_lag_in_frames :              25
      [libvpx-vp9 @ 0x55ce67b32200] rate control settings
        rc_dropframe_thresh :          0
        rc_resize_allowed :            0
        rc_resize_up_thresh :          60
        rc_resize_down_thresh :        30
        rc_end_usage :                 0
        rc_twopass_stats_in :          (nil)(0)
        rc_target_bitrate :            200
      [libvpx-vp9 @ 0x55ce67b32200] quantizer settings
        rc_min_quantizer :             0
        rc_max_quantizer :             63
      [libvpx-vp9 @ 0x55ce67b32200] bitrate tolerance
        rc_undershoot_pct :            25
        rc_overshoot_pct :             25
      [libvpx-vp9 @ 0x55ce67b32200] decoder buffer model
        rc_buf_sz :                    6000
        rc_buf_initial_sz :            4000
        rc_buf_optimal_sz :            5000
      [libvpx-vp9 @ 0x55ce67b32200] 2 pass rate control settings
        rc_2pass_vbr_bias_pct :        50
        rc_2pass_vbr_minsection_pct :  0
        rc_2pass_vbr_maxsection_pct :  2000
      [libvpx-vp9 @ 0x55ce67b32200] keyframing settings
        kf_mode :                      1
        kf_min_dist :                  0
        kf_max_dist :                  128
      [libvpx-vp9 @ 0x55ce67b32200]
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_control
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_CPUUSED :             1
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_MAXFRAMES :      0
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_STRENGTH :       3
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_TYPE :           3
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_STATIC_THRESHOLD :    0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_COLOR_SPACE :         0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_COLOR_RANGE :         0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_TARGET_LEVEL :        255
      [libvpx-vp9 @ 0x55ce67b32200] Using deadline : 1000000
      Output #0, webm, to ’output.webm’ :
        Metadata :
          encoder : Lavf57.83.100
          Stream #0:0(eng), 0, 1/1000 : Video : vp9 (libvpx-vp9), 1 reference frame, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 0/1, q=-1—1, 200 kb/s, 23.98 fps, 1k tbn, 23.98 tbc (default)
          Metadata :
            DURATION : 00:00:15.025000000
            encoder : Lavc57.107.100 libvpx-vp9
          Side data :
            cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 120 times
      [out_0_0 @ 0x55ce67ac35a0] EOF on sink link out_0_0:default.
      No more output streams to write to, finishing.
      [webm @ 0x55ce67b2e2a0] get_metadata_duration returned : 15025000
      [webm @ 0x55ce67b2e2a0] Write early duration from recording time = 1000
      [webm @ 0x55ce67b2e2a0] end duration = 0
      [webm @ 0x55ce67b2e2a0] stream 0 end duration = 0
      frame=    0 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A speed=   0x
      video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
      Input file #0 (test.webm) :
        Input stream #0:0 (video) : 120 packets read (1031599 bytes) ; 112 frames decoded ;
        Total : 120 packets (1031599 bytes) demuxed
      Output file #0 (output.webm) :
        Output stream #0:0 (video) : 0 frames encoded ; 0 packets muxed (0 bytes) ;
        Total : 0 packets (0 bytes) muxed
      Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
      112 frames successfully decoded, 0 decoding errors
      [AVIOContext @ 0x55ce67b2e9a0] Statistics : 13 seeks, 9 writeouts
      [AVIOContext @ 0x55ce67a01660] Statistics : 2137508 bytes read, 4 seeks