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• FFMPEG Link error

  30 novembre 2014, par Thomas

  I’m trying to compile a modified version of this transcoding example from the FFMPEG site, I’ve used all the required includes and joined the libs using this :

  INCLUDEPATH += $$(FFMPEG_DEV_PATH)\include
  
      LIBS += -L$$(FFMPEG_DEV_PATH)\lib -lavformat -lavcodec -lavutil -lswscale -liconv -lz -lavfilter

  but I get this linking error that I can’t understand :

    "avio_close(AVIOContext*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "av_strerror(int, char*, unsigned long)", referenced from:
  
        av_make_error_string(char*, unsigned long, int) in PhVideoEncoder.o
  
    "av_rescale_q(long long, AVRational, AVRational)", referenced from:
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "av_frame_free(AVFrame**)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "av_read_frame(AVFormatContext*, AVPacket*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avcodec_close(AVCodecContext*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avcodec_open2(AVCodecContext*, AVCodec const*, AVDictionary**)", referenced from:
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "av_dump_format(AVFormatContext*, int, char const*, int)", referenced from:
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "av_frame_alloc()", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
    "av_free_packet(AVPacket*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "av_init_packet(AVPacket*)", referenced from:
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "av_opt_set_bin(void*, char const*, unsigned char const*, int, int)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "av_register_all()", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "av_rescale_q_rnd(long long, AVRational, AVRational, AVRounding)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "av_write_trailer(AVFormatContext*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avfilter_graph_free(AVFilterGraph**)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avfilter_inout_free(AVFilterInOut**)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avformat_new_stream(AVFormatContext*, AVCodec const*)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)", referenced from:
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
    "avcodec_copy_context(AVCodecContext*, AVCodecContext const*)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "avcodec_find_decoder(AVCodecID)", referenced from:
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
    "avcodec_find_encoder(AVCodecID)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "avfilter_get_by_name(char const*)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avfilter_graph_alloc()", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avfilter_inout_alloc()", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avformat_close_input(AVFormatContext**)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avcodec_decode_audio4(AVCodecContext*, AVFrame*, int*, AVPacket const*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, AVPacket const*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avcodec_encode_audio2(AVCodecContext*, AVPacket*, AVFrame const*, int*)", referenced from:
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "avcodec_encode_video2(AVCodecContext*, AVPacket*, AVFrame const*, int*)", referenced from:
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "avfilter_graph_config(AVFilterGraph*, void*)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avfilter_register_all()", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avformat_free_context(AVFormatContext*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "avformat_write_header(AVFormatContext*, AVDictionary**)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "av_get_sample_fmt_name(AVSampleFormat)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "av_buffersink_get_frame(AVFilterContext*, AVFrame*)", referenced from:
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
    "avfilter_graph_parse_ptr(AVFilterGraph*, char const*, AVFilterInOut**, AVFilterInOut**, void*)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avformat_find_stream_info(AVFormatContext*, AVDictionary**)", referenced from:
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
    "av_interleaved_write_frame(AVFormatContext*, AVPacket*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
    "av_buffersrc_add_frame_flags(AVFilterContext*, AVFrame*, int)", referenced from:
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
    "avfilter_graph_create_filter(AVFilterContext**, AVFilter const*, char const*, char const*, void*, AVFilterGraph*)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "av_get_default_channel_layout(int)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avformat_alloc_output_context2(AVFormatContext**, AVOutputFormat*, char const*, char const*)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "av_get_channel_layout_nb_channels(unsigned long long)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
    "av_frame_get_best_effort_timestamp(AVFrame const*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "av_log(void*, int, char const*, ...)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
        PhVideoEncoder::flush_encoder(unsigned int) in PhVideoEncoder.o
  
        PhVideoEncoder::open_input_file(char const*) in PhVideoEncoder.o
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
        PhVideoEncoder::encode_write_frame(AVFrame*, unsigned int, int*) in PhVideoEncoder.o
  
        ...
  
    "av_free(void*)", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "av_malloc(unsigned long)", referenced from:
  
        av_malloc_array(unsigned long, unsigned long) in PhVideoEncoder.o
  
    "av_strdup(char const*)", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "avio_open(AVIOContext**, char const*, int)", referenced from:
  
        PhVideoEncoder::open_output_file(char const*) in PhVideoEncoder.o

  I tried looking for missing libraries but with no luck... What am I missing ?

  EDIT

  Thanks to the first answer, I added the extern C stuff but I still face a few errors :

  Undefined symbols for architecture x86_64:
  
    "_av_buffersink_get_frame", referenced from:
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
    "_av_buffersrc_add_frame_flags", referenced from:
  
        PhVideoEncoder::filter_encode_write_frame(AVFrame*, unsigned int) in PhVideoEncoder.o
  
    "_avfilter_get_by_name", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_graph_alloc", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_graph_config", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_graph_create_filter", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_graph_free", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
    "_avfilter_graph_parse_ptr", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_inout_alloc", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_inout_free", referenced from:
  
        PhVideoEncoder::init_filter(FilteringContext*, AVCodecContext*, AVCodecContext*, char const*) in PhVideoEncoder.o
  
    "_avfilter_register_all", referenced from:
  
        PhVideoEncoder::PhVideoEncoder(QString) in PhVideoEncoder.o
  
  ld: symbol(s) not found for architecture x86_64

• What video codecs work on Google Chromebook

  3 mars 2019, par MonkeyDLuffy

  I’m trying to put a show on my friends Google Chromebook but the mp4 files show up black when trying to watch them on said Chromebook, audio works fine. I found out that it is a video encoding problem but I cannot find a list of video formats that work on the Chromebook. I have ffmpeg and handbrake to try and test some things, but if someone could tell me a ffmpeg code that will convert the video files into a format that works on a Google Chromebook that would help a lot.

  What I’ve tried :

  ffmpeg -i "Game of Thrones S02E01 The North Remembers.mkv" codec mpeg "Game of Thrones S02E01 The North Remembers.mp4"

  Which gives error :

  [NULL @ 00000177196ea500] Unable to find a suitable output format for
  ’codec’ codec : Invalid argument

• vp8 : fix PPC assembly to work if src_stride != dst_stride

  5 février 2014, par Ronald S. Bultje

  vp8 : fix PPC assembly to work if src_stride != dst_stride
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Janne Grunau <janne-libav@jannau.net>
  

  • [DBH] libavcodec/ppc/vp8dsp_altivec.c