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• How can I tell if a file is a valid video stream using RVideo ?

  8 février 2012, par fenec

  I am trying to see if a file has a valid video stream using the RVideo library :

  read_file.rb :

  require 'rubygems'
  
  require 'rvideo'
  
  
  
  file_path="/mnt/glusterfs/video/2012/02/04/2012-02-04 1000 CSPAN United Nations Security Council Meeting (337711).mp4"
  
  puts file_path
  
  file = RVideo::Inspector.new(:file => file_path)

  I get this error :

  rbennacer@services:~$ ruby read_file.rb 
  
  /mnt/glusterfs/video/2012/02/04/2012-02-04 1000 CSPAN United Nations Security Council Meeting (337711).mp4 
  
  sh: Syntax error: "(" unexpected

  Even when I put a backslash before each space character and parenthesis character, I am getting that error.

• FFMPEG wmv conversion to flv

  25 novembre 2012, par Brandon Grossutti

  anyone using ffmpeg

  I have a fairly simple wmv exported by a user from movie maker with standard output and want to convert to .flv using

  C :>ffmpeg -i "E :\Jab Core 4 Recounters.wmv" -vcodec flv "C :\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\MediaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv" -ar 44100

  the output / error i receive is

  FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilt
  
  er --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac -
  
  -enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enabl
  
  e-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 0 / 52.20. 0
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
  
  /1) -> 30.00 (30/1)
  
  Input #0, asf, from 'E:\Jab Core 4 Recounters.wmv':
  
    Duration: 00:01:55.99, start: 5.000000, bitrate: 813 kb/s
  
      Stream #0.0: Audio: wmav2, 48000 Hz, stereo, s16, 192 kb/s
  
      Stream #0.1: Video: wmv3, yuv420p, 640x480, 586 kb/s, 30 tbr, 1k tbn, 1k tbc
  
  
  
  Output #0, flv, to 'C:\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\Me
  
  diaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv':
  
      Stream #0.0: Video: flv, yuv420p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  
  
      Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  [libmp3lame @ 0x1c0d8d0]flv does not support that sample rate, choose from (4410
  
  0, 22050, 11025).
  
  Could not write header for output file #0 (incorrect codec parameters ?)

  i added th -ar switch when i got the error the first time

  the codec info i have on the file is as follows

  General
  
  Complete name                    : E:\Jab Core 4 Recounters.wmv
  
  Format                           : Windows Media
  
  File size                        : 11.3 MiB
  
  Duration                         : 2mn 0s
  
  Overall bit rate mode            : Variable
  
  Overall bit rate                 : 780 Kbps
  
  Maximum Overall bit rate         : 949 Kbps
  
  Encoded date                     : UTC 2009-03-07 07:02:41.121
  
  Writing application              :  6.0.6000.16386 / Windows Movie Maker
  
  Application                      : Windows Movie Maker 6.0.6000.16386
  
  
  
  Video
  
  ID                               : 2
  
  Format                           : VC-1
  
  Format profile                   : MP@ML
  
  Codec ID                         : WMV3
  
  Codec ID/Info                    : Windows Media Video 9
  
  Codec ID/Hint                    : WMV3
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 587 Kbps
  
  Width                            : 640 pixels
  
  Height                           : 480 pixels
  
  Display aspect ratio             : 4/3
  
  Frame rate                       : 30.000 fps
  
  Resolution                       : 24 bits
  
  Scan type                        : Progressive
  
  Bits/(Pixel*Frame)               : 0.064
  
  Stream size                      : 8.46 MiB (75%)
  
  Language                         : en-us
  
  
  
  Audio
  
  ID                               : 1
  
  Format                           : WMA2
  
  Format profile                   : L3
  
  Codec ID                         : 161
  
  Codec ID/Info                    : Windows Media Audio 2
  
  Description of the codec         : Windows Media Audio 9.2 - VBR Quality 90, 48 kHz, stereo 1-pass VBR
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 186 Kbps
  
  Channel(s)                       : 2 channels
  
  Sampling rate                    : 48.0 KHz
  
  Resolution                       : 16 bits
  
  Stream size                      : 2.68 MiB (24%)
  
  Language                         : en-us

  i see alot of people with this issue with so solution or cause

  any ideas would be helpful
  thanks in advance

• Make video out of pictures (no compression)

  17 avril 2014, par Hermilton

  I have 1000 png files as output from a simulation (total size of all png-files 44.2 MB), and I want to make a video where each frame is simply one png file.
  So it should be something like just concatenating the png files to one movie file.

  I already tried doing this with "ffmpeg"/"avconv" but I'm a novice in this programms, and my output videos turned out to be either way to large (700MB !) or just blurry compared to the pngs.