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  • Absolute timestamp as MP4 start time

    14 juin 2016, par galbarm

    I'd like to store the exact start time a video was recorded on, inside its mp4 container. I need a millisecond accuracy (i.e. year,month,day,hour,sec,milli). Such an accuracy requires 8 bytes.

    The only standard way I found to store a video creation time is to use the mvhd/tkhd/mdhd boxes creation_time field. But according to the base media file format spec, the field only gives a granularity of seconds:

    creation_time is an integer that declares the creation time of this track (in seconds since midnight, Jan. 1, 1904, in UTC time)

    In version 0 the field size was 4 bytes, while in version 1 it was increased to 8 bytes. But the description remained unchanged so it can still only reflect a timestamp in up to second granularity. (for maintaining backward compatibility maybe?)

    So finally, is there a standard way to store a single absolute timestamp with millisecond accuracy in a mp4 container? If the only way to do it, is to store it as a custom metadata, is there an agreed common way to do it according to?

  • Vagrant provision fails to execute the next script without an obvious reason why

    14 juin 2016, par JakeTheSnake

    I've created/co-opted several bash scripts to provision my guest Ubuntu 14.04 OS; the one giving me trouble right now is installing ffmpeg. When the script finishes, vagrant simply does nothing save for sending SSH keep-alives.

    Host OS: Windows 7 x64

    The last output before the infinitely repeating keep-alives is:

    INSTALL libavutil/sha.h
INSTALL libavutil/sha512.h
INSTALL libavutil/stereo3d.h
INSTALL libavutil/threadmessage.h
INSTALL libavutil/time.h
INSTALL libavutil/timecode.h
INSTALL libavutil/timestamp.h
INSTALL libavutil/tree.h
INSTALL libavutil/twofish.h
INSTALL libavutil/version.h
INSTALL libavutil/xtea.h
INSTALL libavutil/tea.h
INSTALL libavutil/lzo.h
INSTALL libavutil/avconfig.h
INSTALL libavutil/ffversion.h

DEBUG ssh: stdout: INSTALL      libavutil/libavutil.pc

DEBUG ssh: stdout: Done

DEBUG ssh: Sending SSH keep-alive...
DEBUG ssh: Sending SSH keep-alive...
DEBUG ssh: Sending SSH keep-alive...

    Here are the relevant scripts:

    Vagrantfile

    # -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure(2) do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at
  # https://docs.vagrantup.com.

  # Every Vagrant development environment requires a box. You can search for
  # boxes at https://atlas.hashicorp.com/search.
  config.vm.box = 'ubuntu/trusty64'
  config.vm.hostname = 'dev'

  config.ssh.forward_agent = true
  config.ssh.pty = true

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  config.vm.network :private_network, type: :dhcp, auto_config: false

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  config.vm.network :public_network,
                    ip: '192.168.11.14',
                    bridge: 'Realtek PCIe GBE Family Controller'

  # Share an additional folder to the guest VM. The first argument is
  # the path on the host to the actual folder. The second argument is
  # the path on the guest to mount the folder. And the optional third
  # argument is a set of non-required options.
  #
  # Do not share root directory of vagrant
  # config.vm.synced_folder '.', '/vagrant', disabled: true
  # Share ruby repository directories
  config.vm.synced_folder '.',
                          '/home/vagrant/apps',
                          nfs: true,
                          mount_options: [
                            'nfsvers=3',
                            'vers=3',
                            'actimeo=1',
                            'rsize=8192',
                            'wsize=8192',
                            'timeo=14',
                            :nolock,
                            :udp,
                            :intr,
                            :user,
                            :auto,
                            :exec,
                            :rw
                          ]

  # Provider-specific configuration so you can fine-tune various
  # backing providers for Vagrant. These expose provider-specific options.
  # Example for VirtualBox:
  #
  config.vm.provider :virtualbox do |vb|
    # Display the VirtualBox GUI when booting the machine
    vb.gui = true

    # Use VBoxManage to customize the VM.
    vb.name = 'Ubuntu'
    vb.cpus = 4
    vb.memory = 2048
    vb.customize ['modifyvm', :id, '--vram', 64]
    vb.customize ['modifyvm', :id, '--audio', :dsound]
    vb.customize ['modifyvm', :id, '--audiocontroller', :ac97]
    vb.customize ['modifyvm', :id, '--clipboard', :bidirectional]
  end

  # Provisioning
  config.vm.provision :shell, path: './provisioning/user/install-apps.sh',
                              privileged: false, name: 'Applications'
  config.vm.provision :shell, path: './provisioning/user/install-rvm.sh',
                              args: 'stable', privileged: false, name: 'RVM'
  config.vm.provision :shell, path: './provisioning/user/install-ruby.sh',
                              args: '2.3.1', privileged: false, name: 'Ruby'
  config.vm.provision :shell, path: './provisioning/user/install-ruby-gems.sh',
                              privileged: false, name: 'Ruby Gems'
  config.vm.provision :shell, path: './provisioning/root/install-nginx.sh',
                              args: '1.9.9', name: 'Nginx'

  config.vm.provision :chef_solo do |chef|
    # chef.version = '12.10.40'

    # Paths to your cookbooks (on the host)
    chef.cookbooks_path = ['cookbooks']
    # Add chef recipes
    chef.add_recipe 'apt'
    chef.add_recipe 'git' # Is required for NPM
    chef.add_recipe 'sqlite'
    chef.add_recipe 'mysql'
    chef.add_recipe 'nodejs'
    chef.add_recipe 'memcached'
    chef.add_recipe 'imagemagick'
    chef.add_recipe 'optipng'
    chef.add_recipe 'sublime-text'
    chef.add_recipe 'tomcat'
  end
end

    install-apps.sh

    #!/usr/bin/env bash

echo Turning off console beeps...
grep '^set bell-style none' /etc/inputrc || echo 'set bell-style none' >> /etc/inputrc

echo Installing languages
sudo apt-get -y update
sudo locale-gen en_US en_US.UTF-8
sudo dpkg-reconfigure locales

echo Installing essential apps
sudo apt-get -y install build-essential curl yasm

echo Installing desktop apps
sudo apt-get -y install ubuntu-desktop

hash ffmpeg 2>/dev/null || {
  # Build ffmpeg
  echo Installing ffmpeg

  sudo apt-get -y install autoconf automake libass-dev libfreetype6-dev \
    libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev \
    libxcb-xfixes0-dev pkg-config texinfo zlib1g-dev libx264-dev libmp3lame-dev libopus-dev

  mkdir ~/ffmpeg_sources
  cd ~/ffmpeg_sources
  wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  tar xjvf ffmpeg-snapshot.tar.bz2
  cd ffmpeg
  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
    --prefix="$HOME/ffmpeg_build" \
    --pkg-config-flags="--static" \
    --extra-cflags="-I$HOME/ffmpeg_build/include" \
    --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
    --bindir="$HOME/bin" \
    --enable-gpl \
    --enable-libass \
    --enable-libfreetype \
    --enable-libmp3lame \
    --enable-libopus \
    --enable-libtheora \
    --enable-libvorbis \
    --enable-libx264 \
    --enable-nonfree

  PATH="$HOME/bin:$PATH" make
  make install
  make distclean
  hash -r

  source ~/.profile
}

echo Done
exit 0

    install-rvm.sh

    #!/usr/bin/env bash

echo Installing RVM gpg key
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 --trust-model always

echo Installing RVM
\curl -sSL https://get.rvm.io | bash -s $1

exit 0

    I won't include the other scripts for the sake of brevity. When logging into vagrant with the gui nothing seems out of the ordinary, and ffmpeg is available...but nothing else is provisioned. No RVM, no Nginx, nothing.

  • ffmpeg concat avi files loosing the audio

    14 juin 2016, par Nir Diamant

    Hey i have 2 AVI files that i want to concatenate them to one output.

    the files path is written in text file (mylist.txt):

    file1.avi - contain video only. file2.avi - contain video and audio.

    i execute the next command:

    ffmpeg -f concat -i C:\ffmpeg\mylist.txt -c copy C:\ffmpeg\output.avi

    mylist.txt=

    file 'C:\motionbee\ffmpeg\bin\file1.avi'

    file 'C:\motionbee\ffmpeg\bin\file2.avi'

    the output file is concatenate of the 2 files. but the sound from file2.avi is not there.

    so how can i contact them without delete the sound???

    console log:

    C:\motionbee\ffmpeg\bin>ffmpeg -f concat -i C:\motionbee\ffmpeg\bin\mylist.txt -
c copy C:\motionbee\ffmpeg\bin\output.avi
ffmpeg version N-78949-g6f5048f Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
-lzma --enable-decklink --enable-zlib
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 27.101 / 57. 27.101
  libavformat    57. 28.100 / 57. 28.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 39.100 /  6. 39.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, concat, from 'C:\motionbee\ffmpeg\bin\mylist.txt':
  Duration: N/A, start: 0.000000, bitrate: 523 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 720
x480 [SAR 32:27 DAR 16:9], 523 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
File 'C:\motionbee\ffmpeg\bin\output.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'C:\motionbee\ffmpeg\bin\output.avi':
  Metadata:
    ISFT            : Lavf57.28.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480 [SAR 32:27 D
AR 16:9], q=2-31, 523 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[concat @ 0000000000452620] New audio stream 0:1 at pos:10038 and DTS:100.104s
frame= 6000 fps=0.0 q=-1.0 Lsize=   13020kB time=00:03:20.23 bitrate= 532.7kbits
/s speed=1.39e+003x
video:12870kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
 overhead: 1.159987%

    thanks.

  • Output FFMPEG progress via Node

    14 juin 2016, par ErraticFox

    I am building a desktop app with Node.js and Electron. This app is only client side, there is no servers and uses FFMPEG. I've seen there's a way to display the progress via PHP, but I was wondering if I was able to do this via Node.

    I found this, but I can't seem to get it to output progress. The code below is what I am using for that Node Module and the console only logs [] after conversion is complete.

    var inputDir = uploadFile.files[0].path
        var spawn = require('child_process').spawn
        var ffmpegBin = require('ffmpeg-static'),
            progressStream = require('ffmpeg-progress-stream')
        var params = [
            '-y',
            '-i',
            inputDir,
            "C:\\Users\\ErraticFox\\Desktop\\output.mp3"
        ]

        ffmpeg = spawn(ffmpegBin.path, params);
        ffmpeg.stderr
            .pipe(progressStream(120))
            .pipe(concat(function(data) {
                results = data;
                console.log(data)
            }))

  • Reading images from AXIS ip camera using OpenCV

    14 juin 2016, par batuman

    I am trying to access AXIS IP camera from my program using OpenCV. My OpenCV version is 3.1. I follow this tutorial link.

    I have all libraries installed. My following program can load mp4 video successfully. That means ffmpeg and necessary libraries are working fine.

    #include 
#include opencv.hpp>

using namespace std;
int main() {
    cv::VideoCapture vcap("test.mp4");
    cv::Mat image;
//    const string address = "rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1";
//    if(!vcap.open(address)){
//      std::cout << "Error opening video stream or file " << std::endl;
//      return -1;
//    }
    for(;;){
        if(!vcap.read(image)){
            std::cout << "No frame" << std::endl;
            cv::waitKey(0);
        }
        cv::imshow("Display", image);
        cv::waitKey(1);
    }
    return 0;
}

    When I tried to access the IP Camera as follow

    cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");

    I have the following error

    GStreamer Plugin: Embedded video playback halted; module source reported: Could 
not open resource for reading and writing.
OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
) in cvCaptureFromCAM_GStreamer, file /home/Softwares/opencv/opencv/modules
/videoio/src/cap_gstreamer.cpp, line 818
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/Softwares/opencv/opencv/modules/videoio/src/cap_gstreamer.
cpp:818: error: (-2) GStreamer: unable to start pipeline
 in function cvCaptureFromCAM_GStreamer

    User is root and password is pass and ip 192.168.0.90 are all defaults.

    My if config gave me

    ifconfig
eth0      Link encap:Ethernet  HWaddr b8:2a:72:c6:b8:13  
          inet6 addr: fe80::ba2a:72ff:fec6:b813/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:723959 errors:0 dropped:0 overruns:0 frame:0
          TX packets:116637 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:199422245 (199.4 MB)  TX bytes:13701699 (13.7 MB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:24829 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24829 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2502903 (2.5 MB)  TX bytes:2502903 (2.5 MB)

wlan0     Link encap:Ethernet  HWaddr a0:a8:cd:99:92:60  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

    What could be the problem for this access to the camera?

    Thanks

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