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• Build Opencv3.1 with ffmpeg

  10 mai 2018, par batuman

  I tried to build Opencv3.1 at Ubuntu16.04 with ffmpeg.
  I follow the instructions how to install ffmpeg at here.

  According to this discussion ,I checked.

  >> mediainfo ~/Desktop/grb_2.mp4 
  
  General
  
  Complete name                            : /home/nyan/Desktop/grb_2.mp4
  
  Format                                   : MPEG-4
  
  Format profile                           : Base Media
  
  Codec ID                                 : isom (isom/iso2/avc1/mp41)
  
  File size                                : 445 KiB
  
  Duration                                 : 27s 862ms
  
  Overall bit rate                         : 131 Kbps
  
  Encoded date                             : UTC 1904-01-01 00:00:00
  
  Tagged date                              : UTC 1904-01-01 00:00:00
  
  Writing application                      : Lavf57.66.105
  
  
  
  Video
  
  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : High@L3
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 4 frames
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 27s 862ms
  
  Bit rate                                 : 128 Kbps
  
  Width                                    : 720 pixels
  
  Height                                   : 480 pixels
  
  Display aspect ratio                     : 4:3
  
  Original display aspect ratio            : 4:3
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 29.970 (30000/1001) fps
  
  Standard                                 : NTSC
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.012
  
  Stream size                              : 435 KiB (98%)
  
  Writing library                          : x264 core 148
  
  Encoding settings                        : 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=-2 / 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
  
  Encoded date                             : UTC 1904-01-01 00:00:00
  
  Tagged date                              : UTC 1904-01-01 00:00:00 
  
  
  
  
  
  
  
  
  
  
  
  ffmpeg -codecs | grep -i avc
  
  ffmpeg version N-90982-gb995ec0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
    configuration: --prefix=/home/nyan/ffmpeg_build --enable-shared --extra-cflags=-I/home/nyan/ffmpeg_build/include --extra-ldflags=-L/home/nyan/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/nyan/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      56. 18.100 / 56. 18.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.101 / 58. 13.101
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 21.100 /  7. 21.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m ) (encoders: libx264 libx264rgb h264_v4l2m2m h264_vaapi )
  
   D.A.L. avc                  On2 Audio for Video Codec (decoders: on2avc )

  So my ffmpeg installation is ok.

  When I cmake to my Opencv, I have set up to ffmpeg as

  

  But when I make to compile, I have error as

  make[2]: *** No rule to make target '/home/nyan/ffmpeg_build/lib/libavresample.a', needed by 'lib/libopencv_videoio.so.3.1.0'.  Stop.
  
  CMakeFiles/Makefile2:8709: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
  
  make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
  
  Makefile:160: recipe for target 'all' failed
  
  make: *** [all] Error 2

  How can I fix the problem ?

  I install libavresample manually and

  sudo apt-get install libavresample-dev
  
  [sudo] password for nyan: 
  
  Reading package lists... Done
  
  Building dependency tree       
  
  Reading state information... Done
  
  libavresample-dev is already the newest version (7:2.8.14-0ubuntu0.16.04.1).

  It is newest version.

  EDIT:

  Actually libavresample at ffmpeg is deprecated already.
  So I tried to install Opencv3.4.1 higher version.
  Compile, build and installation are fine.
  But VideoCapture cap(0); does not read from the device.
  So I checked ffmpeg at Opencv3.4.1 installation as

  python -c "import cv2; print(cv2.getBuildInformation())" | grep -i ffmpeg

  FFMMPEG IS NO. So build with ffmpeg is not successful even though there was no error at build for Opencv3.4.1.

• FFMPEG- Streaming Stops after few seconds

  25 mars 2019, par Manjot Singh Kalsi

  Hi there dear community

  This is the thing that I am dealing with, since last few days. After thorough search in the ffmpeg community, I was unable to find the solution. I am unable to Stream local flv, to facebook rtmp server.

  I am running the following command to stream my local flv video to the rtmp server of Facebook for Live-Streaming of my local File.

  ```ffmpeg -re -i SampleM.flv -acodec libmp3lame  -ar 44100 -b:a 128k -pix_fmt yuv420p -profile:v baseline -s 426x240 -bufsize 6000k -vb 400k -maxrate 1500k -deinterlace -vcodec libx264 -preset veryfast -g 30 -r 30 -f flv "rtmp://live-api.facebook.com:80/rtmp/my_key"```

  It has been a misfortune-situation that even after reading ffmpeg documentation, I have been unable to find the issue that is leading me to this situation as follows.

  I am still missing something that i need to know.

  Following is the log to the execution of the above command.

  ```ffmpeg version N-91024-g293a6e8332 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 18.100 / 56. 18.100
  
    libavcodec     58. 19.101 / 58. 19.101
  
    libavformat    58. 13.102 / 58. 13.102
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 21.100 /  7. 21.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, flv, from '.\video.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : 1
  
      creationdate    : Fri Feb 03 11:52:46 2006
  
                      :
  
    Duration: 00:00:16.92, start: 0.000000, bitrate: 316 kb/s
  
      Stream #0:0: Audio: mp3, 22050 Hz, stereo, fltp, 40 kb/s
  
      Stream #0:1: Video: vp6f, 1 reference frame, yuv420p, 360x288 (368x288), 266 kb/s, 25 fps, 25 tbr, 1k tbn
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (vp6f (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (mp3 (mp3float) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  [graph_1_in_0_0 @ 0000020c0bcc4200] tb:1/22050 samplefmt:fltp samplerate:22050 chlayout:0x3
  
  [format_out_0_1 @ 0000020c0bca2cc0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
  
  [auto_resampler_0 @ 0000020c0bca5140] ch:2 chl:stereo fmt:fltp r:22050Hz -> ch:2 chl:stereo fmt:fltp r:44100Hz
  
  [graph 0 input from stream 0:1 @ 0000020c0c4f4600] w:360 h:288 pixfmt:yuv420p tb:1/1000 fr:25/1 sar:0/1 sws_param:flags=2
  
  [scaler_out_0_0 @ 0000020c0c4f73c0] w:426 h:240 flags:'bicubic' interl:0
  
  [scaler_out_0_0 @ 0000020c0c4f73c0] w:360 h:288 fmt:yuv420p sar:0/1 -> w:426 h:240 fmt:yuv420p sar:0/1 flags:0x4
  
  [libx264 @ 0000020c0bc80600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0000020c0bc80600] profile Constrained Baseline, level 3.0
  
  [libx264 @ 0000020c0bc80600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=7 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=30 keyint_min=3 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1500 vbv_bufsize=6000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, flv, to 'rtmp://live-api.facebook.com:80/rtmp/my key:
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : 1
  
      creationdate    : Fri Feb 03 11:52:46 2006
  
                      :
  
      encoder         : Lavf58.13.102
  
      Stream #0:0: Video: h264 (libx264), 1 reference frame ([7][0][0][0] / 0x0007), yuv420p, 426x240, q=-1--1, 400 kb/s, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc58.19.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 1500000/0/400000 buffer size: 6000000 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp, delay 1105, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc58.19.101 libmp3lame
  
  No more output streams to write to, finishing.e=00:00:16.51 bitrate= 533.3kbits/s speed=0.992x
  
  [flv @ 0000020c0bc97fc0] Failed to update header with correct duration.
  
  [flv @ 0000020c0bc97fc0] Failed to update header with correct filesize.
  
  frame=  424 fps= 25 q=-1.0 Lsize=    1153kB time=00:00:16.95 bitrate= 557.1kbits/s speed=0.997x
  
  video:869kB audio:265kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.666647%
  
  Input file #0 (.\video.flv):
  
    Input stream #0:0 (audio): 649 packets read (84767 bytes); 649 frames decoded (373824 samples);
  
    Input stream #0:1 (video): 424 packets read (566376 bytes); 424 frames decoded;
  
    Total: 1073 packets (651143 bytes) demuxed
  
  Output file #0 (rtmp://live-api.facebook.com:80/rtmp/my key):
  
    Output stream #0:0 (video): 424 frames encoded; 424 packets muxed (889641 bytes);
  
    Output stream #0:1 (audio): 649 frames encoded (747648 samples); 650 packets muxed (271673 bytes);
  
    Total: 1074 packets (1161314 bytes) muxed
  
  [libx264 @ 0000020c0bc80600] frame I:18    Avg QP:27.75  size:  7001
  
  [libx264 @ 0000020c0bc80600] frame P:406   Avg QP:32.67  size:  1879
  
  [libx264 @ 0000020c0bc80600] mb I  I16..4: 39.3%  0.0% 60.7%
  
  [libx264 @ 0000020c0bc80600] mb P  I16..4:  8.3%  0.0%  2.3%  P16..4: 42.2% 16.2%  4.4%  0.0%  0.0%    skip:26.6%
  
  [libx264 @ 0000020c0bc80600] final ratefactor: 28.61
  
  [libx264 @ 0000020c0bc80600] coded y,uvDC,uvAC intra: 40.2% 33.7% 9.2% inter: 23.8% 7.5% 0.2%
  
  [libx264 @ 0000020c0bc80600] i16 v,h,dc,p: 24% 50% 20%  6%
  
  [libx264 @ 0000020c0bc80600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 34% 18%  5%  5%  4%  8%  4%  8%
  
  [libx264 @ 0000020c0bc80600] i8c dc,h,v,p: 67% 24%  7%  2%
  
  [libx264 @ 0000020c0bc80600] kb/s:418.33```

  This Image shows that The stream was alive few Few Seconds on Facebook

  ```[flv @ 0000020c0bc97fc0] Failed to update header with correct duration.
  
  [flv @ 0000020c0bc97fc0] Failed to update header with correct filesize.```

  Please correct me, the above error listed in the log, seems to be the main cause that the video stops streaming after few seconds. I’ve checked for the latency issues, But they won’t help anyway.

  Please Help me to tackle this issue. I’ll be very much thankful. :’)

  Streaming ends even earlier, when I use Google compute engine, instead my own PC as streaming service.

• ffmpeg - duration usage in input text file

  12 mai 2018, par Voicu

  I am trying to use ffmpeg to concatenate video segments with some black screen. To do that I’ve first generated a blank 10-second video (no audio track) with :

  $ ffmpeg -f lavfi -i color=black:s=320x240:r=1 -f lavfi -i anullsrc -t 10 -vcodec libvpx -an blank.mkv

  I then created the simplest possible scenario within input.txt file (contents below) in order to have three seconds of black screen followed by some video (no audio track) :

  file 'blank.mkv'
  
  duration 3
  
  file 'video_example.mkv'

  And, finally, ran the following ffmpeg command to concat the contents of that input file :

  $ ffmpeg -f concat -i input.txt -codec:v copy -codec:a copy output.mkv

  The issue that I have is that the duration 3 is not considered, so the final video still has ten seconds of black frames (instead of three) followed by my video. And also "Non-monotonous DTS in output stream 0:0 ..." message is shown when using duration x in the file. If I remove duration the warnings are gone and getting the 10-second black screen first output as well.

  Full output of the ffmpeg concat command :

  $ ffmpeg -hide_banner -f concat -i input.txt -codec:v copy -codec:a copy output.mkv
  
  Input #0, concat, from 'input.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc
  
      Metadata:
  
        ENCODER         : Lavc57.107.100 libvpx
  
        DURATION        : 00:00:10.000000000
  
  File 'output.mkv' already exists. Overwrite ? [y/N] y
  
  Output #0, matroska, to 'output.mkv':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: vp8 (VP80 / 0x30385056), yuv420p(progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 1 fps, 1 tbr, 1k tbn, 1k tbc
  
      Metadata:
  
        ENCODER         : Lavc57.107.100 libvpx
  
        DURATION        : 00:00:10.000000000
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [concat @ 000000000031a440] DTS 3000 < 9000 out of order
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 3000; changing to 9000. This may result in incorrect timestamps in the output file.
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 4001; changing to 9000. This may result in incorrect timestamps in the output file.
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 4998; changing to 9000. This may result in incorrect timestamps in the output file.
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 6004; changing to 9000. This may result in incorrect timestamps in the output file.
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 7002; changing to 9000. This may result in incorrect timestamps in the output file.
  
  [matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 8005; changing to 9000. This may result in incorrect timestamps in the output file.
  
  frame= 5794 fps=0.0 q=-1.0 Lsize=    7109kB time=01:37:09.70 bitrate=  10.0kbits/s speed=5.16e+004x
  
  video:7043kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.926229%

  Any idea what am I doing wrong ? The warning seems to hint towards the issue here.

  Other possibly useful info :

  $ ffprobe -hide_banner blank.mkv
  
  Input #0, matroska,webm, from 'blank.mkv':
  
    Metadata:
  
      ENCODER         : Lavf57.83.100
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: 1 kb/s
  
      Stream #0:0: Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc57.107.100 libvpx
  
        DURATION        : 00:00:10.000000000
  
  
  
  $ ffprobe -hide_banner video_example.mkv
  
  Input #0, matroska,webm, from 'video_example.mkv':
  
    Metadata:
  
      encoder         : GStreamer matroskamux version 1.8.1.1
  
      creation_time   : 2018-05-04T17:57:04.000000Z
  
    Duration: 01:37:08.70, start: 15434.269000, bitrate: 9 kb/s
  
      Stream #0:0(eng): Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        title           : Video
  
  
  
  $ ffmpeg -v
  
  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)