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• Visual Studio LNK2001 Error, despite using extern "C" for ffmpeg libraries in C++ [duplicate]

  1er février 2020, par Faizan Cassim

  This is what it looks like :

  ’’’

  extern "C"
  
  {
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libavutil/avutil.h"
  
  };

  ’’’

  But I still get these errors when using the FFmpeg libraries in Visual Studio 2019

  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_open_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_read_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_free
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_sample_fmt_name
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_close_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_init_packet
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_receive_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_open2
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_sample_fmt_is_planar
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_close
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_bytes_per_sample
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_packet_unref
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_find_stream_info
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_find_best_stream
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_frame_alloc

  I would be greatfull to anyone who could help me resolve this. I am using C++ for Windows.

• Create HLS streamable audio file from mp3

  15 août 2023, par isADon

  I am using following command to create a hls aac audio file for web streaming

  



  ffmpeg -y -i song.mp3 -c:a aac -b:a 128k -f hls -hls_time 7 -hls_list_size 0 -hls_segment_filename file%d.m4a playlist.m3u8


  



  This command works only with some audio files. With many mp3 files I receive following output :

  



  C:\ffmpeg>ffmpeg -y -i song.mp3 -c:a aac -b:a 128k -f hls -hls_time 7 -hls_list_size 0 -hls_segment_filename file%d.m4a playlist.m3u8
ffmpeg version git-2020-01-31-62d92a8 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 38.100 / 56. 38.100
  libavcodec     58. 67.100 / 58. 67.100
  libavformat    58. 37.100 / 58. 37.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 72.100 /  7. 72.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[mp3 @ 0000027d800babc0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'song.mp3':
  Metadata:
    TSS             : Logic Pro 8.0.2
    iTunNORM        :  000000EE 000000ED 00000C34 00001135 000088F0 0000B505 000080FA 00007577 00009B82 00018F49
    iTunSMPB        :  00000000 00000210 00000A07 00000000008783E9 00000000 007AD4E6 00000000 00000000 00000000 00000000 00000000 00000000
    genre           : Rock
    TCM             : Kevin MacLeod
    album           : Funk and Blues
    TKE             : C
    TBP             : 101
    title           : Funkorama
    artist          : Kevin MacLeod
    date            : 2008-06-16 18:35
  Duration: 00:03:21.46, start: 0.000000, bitrate: 325 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
    Stream #0:1: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 400x400 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Other
Stream mapping:
  Stream #0:1 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Press [q] to stop, [?] for help
[hls @ 0000027d80100c40] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
[libx264 @ 0000027d800c1280] using SAR=1/1
[libx264 @ 0000027d800c1280] MB rate (56250000) > level limit (16711680)
[libx264 @ 0000027d800c1280] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000027d800c1280] profile High 4:4:4 Predictive, level 6.2, 4:4:4, 8-bit
[libx264 @ 0000027d800c1280] 264 - core 159 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, hls, to 'playlist.m3u8':
  Metadata:
    TSS             : Logic Pro 8.0.2
    iTunNORM        :  000000EE 000000ED 00000C34 00001135 000088F0 0000B505 000080FA 00007577 00009B82 00018F49
    iTunSMPB        :  00000000 00000210 00000A07 00000000008783E9 00000000 007AD4E6 00000000 00000000 00000000 00000000 00000000 00000000
    genre           : Rock
    TCM             : Kevin MacLeod
    album           : Funk and Blues
    TKE             : C
    TBP             : 101
    title           : Funkorama
    artist          : Kevin MacLeod
    date            : 2008-06-16 18:35
    encoder         : Lavf58.37.100
    Stream #0:0: Video: h264 (libx264), yuvj444p(pc, progressive), 400x400 [SAR 72:72 DAR 1:1], q=-1--1, 90k fps, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Other
      encoder         : Lavc58.67.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.67.100 aac
[mp3float @ 0000027d80146580] overread, skip -7 enddists: -6 -6 speed=68.6x
[mp3float @ 0000027d80146580] overread, skip -6 enddists: -5 -5
[mp3float @ 0000027d80146580] overread, skip -6 enddists: -4 -4
    Last message repeated 2 times
[mp3float @ 0000027d80146580] overread, skip -7 enddists: -6 -6
    Last message repeated 2 times
[mp3float @ 0000027d80146580] overread, skip -5 enddists: -2 -2
[mp3float @ 0000027d80146580] overread, skip -7 enddists: -6 -6
[mp3float @ 0000027d80146580] overread, skip -6 enddists: -4 -4
    Last message repeated 1 times
[mp3float @ 0000027d80146580] overread, skip -7 enddists: -6 -6
    Last message repeated 1 times
[mp3float @ 0000027d80146580] overread, skip -6 enddists: -4 -4
[mp3float @ 0000027d80146580] overread, skip -5 enddists: -3 -3
[mp3float @ 0000027d80146580] overread, skip -6 enddists: -4 -4
[mp3float @ 0000027d80146580] overread, skip -7 enddists: -6 -6
    Last message repeated 2 times
[mp3float @ 0000027d80146580] overread, skip -5 enddists: -4 -4
[hls @ 0000027d80100c40] Opening 'file0.m4a' for writingate=N/A speed=64.1x
[hls @ 0000027d80100c40] Opening 'playlist.m3u8.tmp' for writing
frame=    1 fps=0.3 q=33.0 Lsize=N/A time=00:03:21.45 bitrate=N/A speed=63.7x
video:7kB audio:3209kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libx264 @ 0000027d800c1280] frame I:1     Avg QP:34.64  size:  6567
[libx264 @ 0000027d800c1280] mb I  I16..4: 19.5% 53.0% 27.5%
[libx264 @ 0000027d800c1280] 8x8 transform intra:53.0%
[libx264 @ 0000027d800c1280] coded y,u,v intra: 46.8% 26.1% 15.3%
[libx264 @ 0000027d800c1280] i16 v,h,dc,p: 38% 39%  9% 14%
[libx264 @ 0000027d800c1280] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 14% 26%  8%  5%  6%  5%  7%  7%
[libx264 @ 0000027d800c1280] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 16% 14%  7%  4%  5%  3%  4%  4%
[libx264 @ 0000027d800c1280] kb/s:4728240.00
[aac @ 0000027d800bcc40] Qavg: 2138.508


  



  Notice the "mp3float overread" message.

  



  It results in a single file0.m4a file without splitting it up after every 7 seconds as specified.
This is an example audio file I am trying to convert to a aac hls stream that results the mentioned problem : https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100474

  



  How can I convert an audio file to a web friendly hls stream with ffmpeg ?

  


• ffmpeg 4.2.2 gives segmentation fault after a while

  2 février 2020, par Eric Feillant

  I have compiled ffmpeg 4.2.2 and it gives me a segmatation fault after a while and i don’t knw why, i put it the request and a part of the debug log file.
  My ffmpeg request :
  /usr/local/bin/ffmpeg -loglevel debug -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i "rtsp ://root:My_PW@My_IP_Address:5541/live.sdp" -f image2 -loop 1 -i ./overlay_score_160.png -i ./partenaire.png -filter_complex ’overlay=x=2:y=1,overlay=(main_w-overlay_w)/2:y=1’ -framerate 25 -crf 18 -preset veryfast -g 50 -vcodec libx264 -acodec copy -f flv rtmp ://localhost/hls/stream1 -async 1 -vsync 1 2> debug.txt

  ffmpeg version 4.2.2-eric-01022020-FF422 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
  
    configuration: --prefix=/usr/local --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-debug --enable-avresample --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-pthreads --enable-libfreetype --enable-filters --enable-openssl --enable-runtime-cpudetect --enable-libxvid --enable-libfontconfig --enable-libspeex --extra-version=eric-01022020-FF422 --docdir=/usr/share/doc/ffmpeg-4.2.2
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Splitting the commandline.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Reading option '-use_wallclock_as_timestamps' ... matched as AVOption 'use_wallclock_as_timestamps' with argument '1'.
  
  Reading option '-rtsp_transport' ... matched as AVOption 'rtsp_transport' with argument 'tcp'.
  
  Reading option '-i' ... matched as input url with argument 'rtsp://root:MyPW@My_IP_Address:5541/live.sdp'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'image2'.
  
  Reading option '-loop' ... matched as AVOption 'loop' with argument '1'.
  
  Reading option '-i' ... matched as input url with argument './overlay_score_160.png'.
  
  Reading option '-i' ... matched as input url with argument './partenaire.png'.
  
  Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'overlay=x=2:y=1,overlay=(main_w-overlay_w)/2:y=1'.
  
  Reading option '-framerate' ... matched as AVOption 'framerate' with argument '25'.
  
  Reading option '-crf' ... matched as AVOption 'crf' with argument '18'.
  
  Reading option '-preset' ... matched as AVOption 'preset' with argument 'veryfast'.
  
  Reading option '-g' ... matched as AVOption 'g' with argument '50'.
  
  Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'libx264'.
  
  Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
  
  Reading option 'rtmp://localhost/hls/stream1' ... matched as output url.
  
  Reading option '-async' ... matched as option 'async' (audio sync method) with argument '1'.
  
  Reading option '-vsync' ... matched as option 'vsync' (video sync method) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set logging level) with argument debug.
  
  Applying option filter_complex (create a complex filtergraph) with argument overlay=x=2:y=1,overlay=(main_w-overlay_w)/2:y=1.
  
  Applying option async (audio sync method) with argument 1.
  
  Applying option vsync (video sync method) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url rtsp://root:MyPW@My_IP_Address:5541/live.sdp.
  
  Successfully parsed a group of options.
  
  
  
  ........
  
  
  
  [libx264 @ 0x55819256fc00] frame=24887 QP=17.51 NAL=2 Slice:P Poc:80  I:53   P:783  SKIP:38   size=8835 bytes
  
  [libx264 @ 0x55819256fc00] frame=24888 QP=21.08 NAL=2 Slice:B Poc:76  I:0    P:219  SKIP:655  size=254 bytes
  
  [h264 @ 0x5581925ca200] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [image2 @ 0x558192485380] Opening './overlay_score_160.png' for reading
  
  [file @ 0x7f32640080c0] Setting default whitelist 'file,crypto'
  
  [AVIOContext @ 0x7f3264008140] Statistics: 1988 bytes read, 0 seeks
  
  [Parsed_overlay_0 @ 0x5581927cbf00] n:20781.000000 t:831.281311 pos:nan x:2.000000 xi:2 y:1.000000 yi:0
  
  [Parsed_overlay_1 @ 0x5581927cdf00] n:20781.000000 t:831.281311 pos:nan x:258.000000 xi:258 y:1.000000 yi:0
  
  Clipping frame in rate conversion by 0.474174
  
  [libx264 @ 0x55819256fc00] frame=24889 QP=22.84 NAL=0 Slice:B Poc:74  I:0    P:7    SKIP:867  size=36 bytes
  
  [h264 @ 0x5581925e68c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [Parsed_overlay_0 @ 0x5581927cbf00] n:20782.000000 t:831.311122 pos:nan x:2.000000 xi:2 y:1.000000 yi:0
  
  [Parsed_overlay_1 @ 0x5581927cdf00] n:20782.000000 t:831.311122 pos:nan x:258.000000 xi:258 y:1.000000 yi:0
  
  Clipping frame in rate conversion by 0.580742
  
  [libx264 @ 0x55819256fc00] frame=24890 QP=22.80 NAL=0 Slice:B Poc:78  I:0    P:190  SKIP:684  size=167 bytes
  
  [h264 @ 0x558192603080] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [image2 @ 0x558192485380] Opening './overlay_score_160.png' for reading
  
  [file @ 0x7f3264007f80] Setting default whitelist 'file,crypto'
  
  [AVIOContext @ 0x7f3264008300] Statistics: 1988 bytes read, 0 seeks
  
  [Parsed_overlay_0 @ 0x5581927cbf00] n:20783.000000 t:831.351278 pos:nan x:2.000000 xi:2 y:1.000000 yi:0
  
  [Parsed_overlay_1 @ 0x5581927cdf00] n:20783.000000 t:831.351278 pos:nan x:258.000000 xi:258 y:1.000000 yi:0
  
  Clipping frame in rate conversion by 0.377281
  
  [libx264 @ 0x55819256fc00] frame=24891 QP=17.17 NAL=2 Slice:P Poc:88  I:1    P:230  SKIP:643  size=806 bytes
  
  frame=24917 fps= 30 q=24.0 size=   25410kB time=00:13:51.90 bitrate= 250.2kbits/s dup=6033 drop=1899 speed=   1x    ^M[h264 @ 0x55819261f840] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [image2 @ 0x558192485380] Opening './overlay_score_160.png' for reading
  
  [file @ 0x7f3264006d80] Setting default whitelist 'file,crypto'
  
  [AVIOContext @ 0x7f32640080c0] Statistics: 1988 bytes read, 0 seeks
  
  [Parsed_overlay_0 @ 0x5581927cbf00] n:20784.000000 t:831.372222 pos:nan x:2.000000 xi:2 y:1.000000 yi:0
  
  [Parsed_overlay_1 @ 0x5581927cdf00] n:20784.000000 t:831.372222 pos:nan x:258.000000 xi:258 y:1.000000 yi:0
  
  Past duration 0.749565 too large
  
  [libx264 @ 0x55819256fc00] frame=24892 QP=18.73 NAL=2 Slice:B Poc:84  I:0    P:29   SKIP:845  size=80 bytes
  
  [h264 @ 0x55819263c000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [image2 @ 0x558192485380] Opening './overlay_score_160.png' for reading
  
  [file @ 0x7f3264007f80] Setting default whitelist 'file,crypto'
  
  [AVIOContext @ 0x7f32640080c0] Statistics: 1988 bytes read, 0 seeks
  
  [image2 @ 0x558192485380] Opening './overlay_score_160.png' for reading
  
  [file @ 0x7f3264006d80] Setting default whitelist 'file,crypto'
  
  [AVIOContext @ 0x7f32640080c0] Statistics: 1988 bytes read, 0 seeks

  Then i get "Segmentation fault" and ffmpeg exits