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  • Generating video from images and audio by FFmpeg

    24 mars 2020, par Cody

    I am new to FFmpeg and video/audio encoding. I try to use Fluent ffmpeg to generate a MP4 video from images and audio.

    There are 2 inputs only :

    If the audio duration is longer video length, just discard the excessive part of audio at the end.
    And all the images have to be shown in same duration.(i.e. The video should be in n/d FPS for n images and video with d second)

    Since the image input are not in number sequence, I use concat demuxer as input :

            let VIDEO_DURATION = 8;
    
        let ffmpeg = await FfmpegUtil.createCommand();
    
        let imageFiles: string[] = ["foo.jpg", "bar.jpg", ...]; //assume there are 67 image files
    
        let demuxerFile = await FfmpegUtil.createConcatDemuxerFile(imageFiles);
    
        let audioFile: string = "path/to/audio.wav";
    

    
        ffmpeg.input(demuxerFile)
    
            .inputOption(
    
                "-f", "concat",
    
                "-safe", "0",
    
            )
    
            .input(audioFile)
    
            .outputOption(
    
                "-r", `${imageFiles.length}/${VIDEO_DURATION}`,
    
            )
    
            .duration(VIDEO_DURATION)
    
            .save("path/to/output.mp4")
    
        ;

    it will spawn a ffmpeg command :

    ffmpeg 
    
    -f concat 
    
    -safe 0 
    
    -i path/to/demuxerFile.txt 
    
    -i path/to/audio.wav 
    
    -y 
    
    -r 67/8
    
    -t 8 
    
    path/to/output.mp4

    However the output file cannot be played.

    I also tried "-framerate", ${imageFiles.length}/${VIDEO_DURATION} in .outputOption(), it still output a file cannot be played and I found the frame rate always be 25 in its file property.

    Update 1 (added spawned command & ffmpeg console log) :

    spawned ffmpeg command & console log ("-r", `${imageFiles.length}/${VIDEO_DURATION}` as outputOption) :

    ffmpeg -f concat -safe 0 -i path/to/demuxerFile.txt -i path/to/audio.wav -y -r 67/8 -t 8 path/to/output_r.mp4
    

    
ffmpeg version git-2020-01-26-5e62100 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. 36.100 / 58. 36.100
    
  libavdevice    58.  9.103 / 58.  9.103
    
  libavfilter     7. 71.100 /  7. 71.100
    
  libswscale      5.  6.100 /  5.  6.100
    
  libswresample   3.  6.100 /  3.  6.100
    
  libpostproc    55.  6.100 / 55.  6.100
    
Input #0, concat, from 'path/to/demuxerFile.txt':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 4677x4677 [SAR 256:256 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
    
Guessed Channel Layout for Input Stream #1.0 : stereo
    
Input #1, wav, from 'path/to/audio.wav':
    
  Metadata:
    
    artist          : TextAloud: IVONA Kimberly22
    
    date            : 2018
    
    genre           : Speech
    
    title           : 38750336.mp3
    
    album           : Created: 7/26/2018 4:56:13 PM
    
    encoder         : Lavf58.16.100
    
    encoded_by      : Lame MP3
    
  Duration: 00:00:15.57, bitrate: 705 kb/s
    
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, stereo, s16, 705 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
    
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
[libx264 @ 000001e395041400] using SAR=1/1
    
[libx264 @ 000001e395041400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    
[libx264 @ 000001e395041400] profile High 4:4:4 Predictive, level 6.0, 4:4:4, 8-bit
    
[libx264 @ 000001e395041400] 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=6 lookahead_threads=1 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=8 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, mp4, to 'path/to/output_r.mp4':
    
  Metadata:
    
    encoder         : Lavf58.36.100
    
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj444p(pc, progressive), 4677x4677 [SAR 256:256 DAR 1:1], q=-1--1, 8.38 fps, 17152 tbn, 8.38 tbc
    
    Metadata:
    
      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) (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.67.100 aac
    
frame=    3 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=    5 fps=4.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=4 speed=   0x    
    
frame=    6 fps=3.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=7 speed=   0x    
    
frame=    8 fps=3.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=10 speed=   0x    
    
frame=   10 fps=3.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=14 speed=   0x    
    
frame=   11 fps=3.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=16 speed=   0x    
    
frame=   13 fps=3.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=20 speed=   0x    
    
frame=   14 fps=3.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=22 speed=   0x    
    
frame=   16 fps=3.1 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=26 speed=   0x    
    
frame=   17 fps=2.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=28 speed=   0x    
    
frame=   18 fps=2.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=31 speed=   0x    
    
frame=   20 fps=2.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=34 speed=   0x    
    
frame=   21 fps=2.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=36 speed=   0x    
    
frame=   23 fps=2.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=40 speed=   0x    
    
frame=   24 fps=2.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=42 speed=   0x    
    
frame=   24 fps=0.7 q=-1.0 Lsize=     752kB time=00:00:08.03 bitrate= 766.4kbits/s dup=0 drop=43 speed=0.22x    
    
video:624kB audio:125kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.359236%
    
[libx264 @ 000001e395041400] frame I:1     Avg QP:12.79  size:257554
    
[libx264 @ 000001e395041400] frame P:15    Avg QP:13.10  size: 20487
    
[libx264 @ 000001e395041400] frame B:8     Avg QP:13.10  size:  9231
    
[libx264 @ 000001e395041400] consecutive B-frames: 45.8% 25.0% 12.5% 16.7%
    
[libx264 @ 000001e395041400] mb I  I16..4: 18.4% 79.2%  2.4%
    
[libx264 @ 000001e395041400] mb P  I16..4:  1.0%  3.3%  0.4%  P16..4:  1.0%  0.2%  0.2%  0.0%  0.0%    skip:93.9%
    
[libx264 @ 000001e395041400] mb B  I16..4:  0.1%  0.2%  0.1%  B16..8:  1.8%  0.1%  0.0%  direct: 2.9%  skip:94.7%  L0:58.1% L1:40.2% BI: 1.7%
    
[libx264 @ 000001e395041400] 8x8 transform intra:75.0% inter:82.7%
    
[libx264 @ 000001e395041400] coded y,u,v intra: 6.1% 3.5% 4.4% inter: 0.2% 1.2% 0.5%
    
[libx264 @ 000001e395041400] i16 v,h,dc,p: 80% 16%  3%  2%
    
[libx264 @ 000001e395041400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46%  8% 44%  0%  0%  0%  0%  0%  0%
    
[libx264 @ 000001e395041400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 27% 25%  3%  3%  3%  4%  3%  3%
    
[libx264 @ 000001e395041400] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 000001e395041400] ref P L0: 75.6%  3.3% 14.8%  6.3%
    
[libx264 @ 000001e395041400] ref B L0: 88.6% 10.7%  0.7%
    
[libx264 @ 000001e395041400] ref B L1: 98.7%  1.3%
    
[libx264 @ 000001e395041400] kb/s:1783.06
    
[aac @ 000001e3951e7f80] Qavg: 55135.730

    spawned ffmpeg command & console log ("-framerate", `${imageFiles.length}/${VIDEO_DURATION}` as outputOption) :

    ffmpeg -f concat -safe 0 -i path/to/demuxerFile.txt -i path/to/audio.wav -y -framerate 67/8 -t 8 path/to/output_framerate.mp4
    

    
ffmpeg version git-2020-01-26-5e62100 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. 36.100 / 58. 36.100
    
  libavdevice    58.  9.103 / 58.  9.103
    
  libavfilter     7. 71.100 /  7. 71.100
    
  libswscale      5.  6.100 /  5.  6.100
    
  libswresample   3.  6.100 /  3.  6.100
    
  libpostproc    55.  6.100 / 55.  6.100
    
Input #0, concat, from 'path/to/demuxerFile.txt':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 4677x4677 [SAR 256:256 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
    
Guessed Channel Layout for Input Stream #1.0 : stereo
    
Input #1, wav, from 'path/to/audio.wav':
    
  Metadata:
    
    artist          : TextAloud: IVONA Kimberly22
    
    date            : 2018
    
    genre           : Speech
    
    title           : 38750336.mp3
    
    album           : Created: 7/26/2018 4:56:13 PM
    
    encoder         : Lavf58.16.100
    
    encoded_by      : Lame MP3
    
  Duration: 00:00:15.57, bitrate: 705 kb/s
    
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, stereo, s16, 705 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
    
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
[libx264 @ 000002460bda4740] using SAR=1/1
    
[libx264 @ 000002460bda4740] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    
[libx264 @ 000002460bda4740] profile High 4:4:4 Predictive, level 6.0, 4:4:4, 8-bit
    
[libx264 @ 000002460bda4740] 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=6 lookahead_threads=1 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, mp4, to 'path/to/output_framerate.mp4':
    
  Metadata:
    
    encoder         : Lavf58.36.100
    
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj444p(pc, progressive), 4677x4677 [SAR 256:256 DAR 1:1], q=-1--1, 25 fps, 12800 tbn, 25 tbc
    
    Metadata:
    
      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) (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.67.100 aac
    
frame=    3 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=    6 fps=5.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=    9 fps=5.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   12 fps=5.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   14 fps=4.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   16 fps=4.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   18 fps=3.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   20 fps=3.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   22 fps=3.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   23 fps=3.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   25 fps=3.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   27 fps=3.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   28 fps=3.1 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   30 fps=3.1 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   33 fps=3.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   36 fps=3.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   38 fps=3.1 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   39 fps=3.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   40 fps=2.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   41 fps=2.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   42 fps=2.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   43 fps=1.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   44 fps=1.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   45 fps=1.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   46 fps=1.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   47 fps=1.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   49 fps=1.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   50 fps=1.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   51 fps=1.5 q=28.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   51 fps=1.3 q=28.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   52 fps=1.3 q=28.0 size=       0kB time=00:00:00.04 bitrate=   8.3kbits/s speed=0.00114x    
    
frame=   53 fps=1.3 q=28.0 size=       0kB time=00:00:00.04 bitrate=   8.3kbits/s speed=0.00111x    
    
frame=   54 fps=1.2 q=28.0 size=       0kB time=00:00:00.04 bitrate=   8.3kbits/s speed=0.00101x    
    
frame=   55 fps=1.2 q=28.0 size=       0kB time=00:00:00.13 bitrate=   2.8kbits/s speed=0.00297x    
    
frame=   56 fps=1.1 q=28.0 size=       0kB time=00:00:00.18 bitrate=   2.1kbits/s speed=0.00377x    
    
frame=   57 fps=1.1 q=28.0 size=     256kB time=00:00:00.23 bitrate=9033.3kbits/s speed=0.00461x    
    
frame=   58 fps=1.1 q=28.0 size=     256kB time=00:00:00.27 bitrate=7527.8kbits/s speed=0.00514x    
    
frame=   59 fps=1.0 q=28.0 size=     256kB time=00:00:00.32 bitrate=6452.4kbits/s speed=0.00571x    
    
frame=   60 fps=1.0 q=28.0 size=     256kB time=00:00:00.37 bitrate=5645.8kbits/s speed=0.00643x    
    
frame=   62 fps=1.0 q=28.0 size=     256kB time=00:00:00.37 bitrate=5645.8kbits/s speed=0.00605x    
    
frame=   62 fps=1.0 q=28.0 size=     256kB time=00:00:00.41 bitrate=5018.5kbits/s speed=0.00668x    
    
frame=   63 fps=1.0 q=28.0 size=     256kB time=00:00:00.46 bitrate=4516.7kbits/s speed=0.00727x    
    
frame=   64 fps=1.0 q=28.0 size=     256kB time=00:00:00.51 bitrate=4106.1kbits/s speed=0.00778x    
    
frame=   65 fps=1.0 q=28.0 size=     256kB time=00:00:00.55 bitrate=3763.9kbits/s speed=0.00827x    
    
frame=   66 fps=1.0 q=28.0 size=     256kB time=00:00:00.60 bitrate=3474.4kbits/s speed=0.00884x    
    
frame=   67 fps=1.0 q=28.0 size=     256kB time=00:00:00.65 bitrate=3226.2kbits/s speed=0.00943x    
    
frame=   67 fps=0.6 q=-1.0 Lsize=     872kB time=00:00:08.03 bitrate= 888.9kbits/s speed=0.0752x    
    
video:744kB audio:125kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.391708%
    
[libx264 @ 000002460bda4740] frame I:1     Avg QP:15.80  size:216204
    
[libx264 @ 000002460bda4740] frame P:29    Avg QP:15.19  size: 10747
    
[libx264 @ 000002460bda4740] frame B:37    Avg QP:17.07  size:  6300
    
[libx264 @ 000002460bda4740] consecutive B-frames: 17.9% 14.9% 31.3% 35.8%
    
[libx264 @ 000002460bda4740] mb I  I16..4: 11.4% 86.0%  2.6%
    
[libx264 @ 000002460bda4740] mb P  I16..4:  0.5%  1.9%  0.2%  P16..4:  0.7%  0.2%  0.1%  0.0%  0.0%    skip:96.5%
    
[libx264 @ 000002460bda4740] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8:  1.3%  0.2%  0.0%  direct: 0.7%  skip:97.5%  L0:57.4% L1:40.7% BI: 1.9%
    
[libx264 @ 000002460bda4740] 8x8 transform intra:79.7% inter:31.4%
    
[libx264 @ 000002460bda4740] coded y,u,v intra: 5.7% 2.9% 3.7% inter: 0.1% 0.5% 0.2%
    
[libx264 @ 000002460bda4740] i16 v,h,dc,p: 70% 23%  4%  2%
    
[libx264 @ 000002460bda4740] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 45%  8% 45%  0%  0%  0%  0%  0%  0%
    
[libx264 @ 000002460bda4740] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 26% 25%  3%  3%  4%  4%  3%  2%
    
[libx264 @ 000002460bda4740] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 000002460bda4740] ref P L0: 72.6%  3.0% 16.6%  7.7%
    
[libx264 @ 000002460bda4740] ref B L0: 75.7% 20.6%  3.7%
    
[libx264 @ 000002460bda4740] ref B L1: 97.7%  2.3%
    
[libx264 @ 000002460bda4740] kb/s:2271.59
    
[aac @ 000002460bda8580] Qavg: 55135.730

  • Measuring success for your SEO content

    20 mars 2020, par Jake Thornton — Uncategorized

    With over a billion searches every day in search engines, it’s hard to underestimate the importance of having your business present on page one (ideally in positions 1 – 3) ranking for the keywords that impact your sales and conversions.

    "In 2019, Google received nearly 2.3 trillion searches and on page one alone, the first five organic results accounted for 67.60% of all the clicks."

    So how is your business performing when it comes to ranking in the crucial top three spots of search for your most important keywords ?

    Accurately measuring the success of your content

    Once you’ve done your keyword research, created compelling content, optimised it to be search-friendly, and hit ‘publish’, you then need to accurately measure the success of your efforts.

    4 tips for measuring the success of your SEO content

    1. Create a custom segment for "Visitors from Search Engines only"

    By creating this custom segment, you’ll be able to analyse the behavioural patterns of the visitors who found your website through a search engine. 

    This way you can use many of Matomo’s powerful features (Visitors, Behaviour, Acquisition, Ecommerce, Goals etc.) focused entirely on search engine visitors only.

    Once you’ve created this segment, you can begin to see key metrics like which entry pages are responsible for referring visitors to your website. For example : Visit Behaviour – Entry Pages, this is a great way to analyse your most effective SEO pages.You may be surprised at what pages currently bring in the most traffic.

    As well as discovering which content resonates with your search audience, you will also be able to create more content focused on your targeted audience. Do this by learning which locations your search visitors are from, which device they use, what time of the day they visited your website and much more.

    >> Learn more about creating custom segments

    2. Website visits, time on site, pages per session, and bounce rate.

    “The top four ranking factors are website visits, time on site, pages per session, and bounce rate.”

    These four metrics set the benchmark for your SEO success.

    First, you need to get as many of the ‘right’ users to see your content. If you feel you’ve exhausted channels such as social media, email and possibly paid posts ; think about who your ideal audience is. Where are they likely to hang out online ? Are there community groups or forum sites that are interested in what you’re writing about ? 

    Whatever the case, putting yourself out there and getting more traffic to your website will help show search engines that people are interested in your website. As a result, they’ll likely rank you higher for that.

    When we say getting more of the ‘right’ users, we mean users who are generally interested in the topic/subject you’re writing about and interested in the work you do. 

    This is important for the next three metrics – increasing users time on your website, increasing the amount of pages your users explore on your website, and reducing the overall bounce rate for users who leave your website in a matter of seconds.

    To evaluate these metrics, go to Behaviour – Pages in your Matomo and see how these metrics vary on previous posts or pages you’ve created. Which pages are already showing you the best results ? Why do they get the results ? Can you focus on creating more content like this ?

    Understanding what content is resonating with your users through these metrics is easy and is the starting point for measuring the success of your SEO content strategy.

    >> Learn more about the Behaviour feature

    3. Row Evolution

    The Row Evolution feature embedded within the Search Engine Keywords Performance plugin lets you see how your ranking positions have changed over time for your important keywords. It also lets you see how the incoming traffic, related to your keywords, has changed over time.

    This is valuable when measuring the changes you’ve made to your landing pages to see if it has a positive or negative effect on your ranking efforts. 

    This also lets you see how search engine algorithm changes affect your search rankings over time, and to see if the effects of these algorithm updates are temporary or long lasting.

    Row evolution allows you to report on keyword performance with ease. If you only check your insights once a week or once a fortnight, you’ll see how ranking positions for your important keywords have changed daily (or even weekly, monthly or yearly however you prefer.)

    >> Learn more about Row Evolution

    4. What results are you getting from the lesser known search engines ?

    "In 2019 (to date), Google accounted for just over 75% of all global desktop search traffic, followed by Bing at 9.97%, Baidu at 9.34%, and Yahoo at 2.77%."

    For most of us, we want to be ranking in the top three spots in Google Search because that’s where the majority of search users are. However, don’t shy away from opportunities you could be missing with lesser known search engines.

    If you sell a product aimed at 55-65 year olds who use a PC computer, chances are they are using Bing. If you have customers in China the majority will be using Baidu, or in our case at Matomo, many of our loyal users use a privacy-friendly search engine like DuckDuckGo or Qwant.

    Some of your ideal customers might be finding you through these alternative search engines, so be sure to measure the impact that these referrals may have on your conversions.

    Strategically including important keywords that impact your business

    While search is an important acquisition channel for most businesses, it’s also one of the most competitive.

    We recommend analysing your keyword and content performance regularly and alter content that isn’t performing as well as you’d like. You need to continually learn from the content that is successful, and focus on creating more content like this. 

    The final thing to remember with search keyword performance is to be patient. If you have had little success in the past with attracting customers through search, it can take time to build this reputation with search engines.

  • How to install dense trajectory without sudoers permission

    7 février 2019, par Albe

    I’m stuck for a week trying to install iDT(https://github.com/chuckcho/iDT) in a server hosted by university in which I don’t have root permissions. (VERSION=12.04.5 LTS)

    I tried to install the 2 main libraries (opencv and ffmpeg) following part(different versions) of this tutorial : http://dridini.blogspot.com/

    I managed (I think) to install the libraries in local :

    ffmpeg -version
    
ffmpeg version N-93084-g835ab35 Copyright (c) 2000-2019 the FFmpeg developers
    
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
configuration: --prefix=/home/XXXXX/ffmpeg_build --extra-cflags=-I/home/XXXXX/ffmpeg_build/include --extra-ldflags=-L/home/XXXXX/ffmpeg_build/lib --bindir=/home/XXXXX/bin --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-pic --enable-shared
    
libavutil      56. 26.100 / 56. 26.100
    
libavcodec     58. 46.100 / 58. 46.100
    
libavformat    58. 26.100 / 58. 26.100
    
libavdevice    58.  6.101 / 58.  6.101
    
libavfilter     7. 48.100 /  7. 48.100
    
libswscale      5.  4.100 /  5.  4.100
    
libswresample   3.  4.100 /  3.  4.100
    
libpostproc    55.  4.100 / 55.  4.100 
    

    
pkg-config --modversion opencv
    
2.4.13.5

    I exported the LD_LIBRARY_PATH where all .so are.(I cannot perform ldconfig after)
    But when I try to make this is the result :

    g++ -L/home/chuck/opencv-2.4.11-cuda7.5/lib -L/opt/lib -pipe -Wall -O3 -ggdb -o release/DenseTrackStab  -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc -lopencv_calib3d -lopencv_features2d -lopencv_nonfree -lopencv_ocl -lavformat -lavdevice -lavutil -lavcodec -lswscale
    
/usr/bin/ld: cannot find -lopencv_core
    
/usr/bin/ld: cannot find -lopencv_highgui
    
/usr/bin/ld: cannot find -lopencv_video
    
/usr/bin/ld: cannot find -lopencv_imgproc
    
/usr/bin/ld: cannot find -lopencv_calib3d
    
/usr/bin/ld: cannot find -lopencv_features2d
    
/usr/bin/ld: cannot find -lopencv_nonfree
    
/usr/bin/ld: cannot find -lopencv_ocl
    
/usr/bin/ld: cannot find -lavformat
    
/usr/bin/ld: cannot find -lavdevice
    
/usr/bin/ld: cannot find -lavutil
    
/usr/bin/ld: cannot find -lavcodec
    
/usr/bin/ld: cannot find -lswscale
    
collect2: ld returned 1 exit status
    
make: *** [release/DenseTrackStab] Error 1

    I tried to modify the makeFile in order to add there the path or typing make with ldflag ( make "LDFLAGS=-L/$HOME/lib/opencv-2.4.13.5/lib/ -L/$HOME/ffmpeg_build/lib") giving me the same result :

    g++ -L/home/XXXXX/opencv-2.4.13.5/release/lib -L/opt/lib -pipe -Wall -O3 -ggdb -o release/DenseTrackStab  -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc -lopencv_calib3d -lopencv_features2d -lopencv_nonfree -lopencv_ocl -lavformat -lavdevice -lavutil -lavcodec -lswscale
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 10
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 1 has invalid symbol index 11
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 2 has invalid symbol index 2
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 3 has invalid symbol index 2
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 4 has invalid symbol index 10
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 5 has invalid symbol index 12
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 6 has invalid symbol index 12
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 7 has invalid symbol index 12
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 8 has invalid symbol index 2
    
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 9 has invalid symbol index 2

    This is the original Makefile

    # custom opencv
    
OPENCV_INC := /home/chuck/opencv-2.4.11-cuda7.5/include
    
OPENCV_LIB := /home/chuck/opencv-2.4.11-cuda7.5/lib
    

    
# set the binaries that have to be built
    
TARGETS := DenseTrackStab Video
    

    
# set the build configuration set 
    
BUILD := release
    
#BUILD := debug
    

    
# set bin and build dirs
    
BUILDDIR := .build_$(BUILD)
    
BINDIR := $(BUILD)
    

    
# libraries 
    
LDLIBS = $(addprefix -l, $(LIBS) $(LIBS_$(notdir $*)))
    
LIBS := \
    
    opencv_core opencv_highgui opencv_video opencv_imgproc opencv_calib3d opencv_features2d opencv_nonfree \
    
    opencv_ocl \
    
    avformat avdevice avutil avcodec swscale
    

    
# set some flags and compiler/linker specific commands
    
CXXFLAGS = -pipe -D __STDC_CONSTANT_MACROS -D STD=std -Wall $(CXXFLAGS_$(BUILD)) -I. -I$(OPENCV_INC) -I/opt/include
    
CXXFLAGS_debug := -ggdb
    
CXXFLAGS_release := -O3 -DNDEBUG -ggdb
    
LDFLAGS = -L$(OPENCV_LIB) -L/opt/lib -pipe -Wall $(LDFLAGS_$(BUILD))
    
LDFLAGS_debug := -ggdb
    
LDFLAGS_release := -O3 -ggdb
    

    
include make/generic.mk

    Is it possible what I’m trying to do or I must give up ? Any better solution for using this software ?
    thank you

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