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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.

• youtube-dl sometime hangs with "[ffmpeg] Correcting container"

  20 mai 2018, par user292344

  Ubuntu 16.04

  /usr/local/bin/youtube-dl --version
  
  2018.05.09

  I have a bash script that attemts to download a youtube video. The output is below. The problem is that sometimes it works perfectly (completes quickly).
  But most of the time it hangs on "Correcting container....". Does anyone know why ?

  + /usr/local/bin/youtube-dl --verbose -x 'https://www.youtube.com/watch?v=8HVWitAW-Qg'
  
  
  
  [debug] System config: []
  
  
  
  [debug] User config: []
  
  
  
  [debug] Custom config: []
  
  
  
  [debug] Command-line args: [u'--verbose', u'-x', u'https://www.youtube.com/watch?v=8HVWitAW-Qg']
  
  
  
  [debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
  
  
  
  [debug] youtube-dl version 2018.05.09
  
  
  
  [debug] Python version 2.7.12 (CPython) - Linux-4.4.0-124-generic-x86_64-with-Ubuntu-16.04-xenial
  
  
  
  [debug] exe versions: avconv 2.8.14-0ubuntu0.16.04.1, avprobe 2.8.14-0ubuntu0.16.04.1, ffmpeg 2.8.14-0ubuntu0.16.04.1, ffprobe 2.8.14-0ubuntu0.16.04.1, rtmpdump 2.4
  
  
  
  [debug] Proxy map: {}
  
  
  
  [youtube] 8HVWitAW-Qg: Downloading webpage
  
  
  
  [youtube] 8HVWitAW-Qg: Downloading video info webpage
  
  
  
  [youtube] 8HVWitAW-Qg: Extracting video information
  
  
  
  [debug] Invoking downloader on u'https://r5---sn-5uaeznkl.googlevideo.com/videoplayback?expire=1526159728&source=youtube&key=yt6&mime=audio%2Fmp4&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&keepalive=yes&lmt=1518142590597815&dur=231.131&mv=m&mt=1526137933&ms=au%2Conr&signature=18BB34F3716B412AC5757872DD2AF402B6EE20D2.43D2E68B5A5ED2E2D3076DF9264B9BB723484821&ip=71.81.217.251&c=WEB&initcwndbps=1583750&mn=sn-5uaeznkl%2Csn-p5qs7n7l&clen=3671757&gir=yes&id=o-AOxj8Rg2IuZek8KwvgPy-N7_FSGzxQ0Zl2HX1T4gepLf&ipbits=0&fvip=5&ei=EAX3WqbOH8fg4QSlkrGoAg&pl=20&mm=31%2C26&itag=140&usequic=no&requiressl=yes&ratebypass=yes'
  
  
  
  [download] Destination: Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a
  
  
  
  [download] 100% of 3.50MiB in 00:00
  
  
  
  [ffmpeg] Correcting container in "Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a"
  
  
  
  [debug] ffmpeg command line: avconv -y -i 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a' -c copy -f mp4 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.temp.m4a'
  
  
  
  ^C
  
  ERROR: Interrupted by user

• Bewildering issue - FFmpeg segment filter desyncs video

  14 mai 2018, par r_jei

  I need to segment a large (72GB) Prores video file and merge the segments to get a file identical to the original.

  ./ffmpeg -i video.mov -codec copy -f segment -segment_time 300 -segment_list list.ffcat -reset_timestamps 1 -v error chunk_%d.mov

  Unfortunately the segments that come from running this command get out of sync after a few seconds of playback with Quicktime Player. Interestingly, seeking, rewinding or fast forwarding appears to resync the video correctly for at least a few seconds.

  The following warning appears whenever a new segment is written :

  [segment @ 0x7f87ae001200] Opening 'chunk_0.mov' for writing
  
  [mov @ 0x7f87ad807200] Valid timecode frame rate must be specified. Minimum value is 1

  Yet, setting the framerate with -r 24 doesn’t help.

  Some potentially relevant metadata :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A004_04121423_C001.mov':
  
    Duration: 00:13:31.25, start: 0.000000, bitrate: 710117 kb/s
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160, 707415 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
  
  
  Output #0, segment, to 'chunk_%d.mov':
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 707415 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)

  I’m on OS X.

  Thanks so much for your time and help on this issue ! I certainly hope I’m not missing something obvious :)

  ---

  UPDATE (May 10) : Comparing the original video file with the segments, I’ve found some interesting differences. Adobe Premiere reports that the original video has the following properties :

  QuickTime Details:
  
  Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 1 timecode track(s).**
  
  
  
  Video:
  
  There are 19470 frames with a **duration of 1/24th.**
  
  
  
  Video track 1:
  
  Duration is **0:13:31:06**
  
  
  
  Video data block #1:
  
  Frame Size = 3840 x 2160
  
  Compressor = 
  
  **Quality = Most (-2623.00)
  
  Temporal = Most (1.00)**
  
  
  
  Timecode data block #1:
  
  Start Time = 14:23:16:02
  
  Reel name = 

  On the other hand, when examining the video resulting from stitching together the segments, we find the following :

  QuickTime Details:
  
  Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 0 timecode track(s).**
  
  
  
  Video:
  
  There are 19470 frames with a **duration of 41/1000ths.**
  
  
  
  Video track 1:
  
  Duration is **0:01:06:00**
  
  
  
  Video data block #1:
  
  Frame Size = 3840 x 2160
  
  Compressor = 
  
  **Quality = Normal (3.00)
  
  Temporal = Normal (3.00)**