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• Cannot suppress ffmpeg output from ruby

  3 avril 2014, par Danny

  I have ruby on rails app that allows users to upload videos. When a video is added, I have a before_save filter that uses ffmpeg to generate a series of thumbnails. The problem is that ffmpeg is producing tons of console output when I'm saving a video item in the rails console, and when I run my tests.

  My environment :

  • Host Machine : OS X 10.9.2
  • Vagrant Box : Ubuntu 10.04.4
  • ffmpeg version : SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.3
  • ruby version : 1.9.3-p194

  Command I'm running :

  `ffmpeg -v 0 -ss #{timestamp} -i #{video_file.path} -y -f image2 -vcodec mjpeg -vframes 1 -s 640*360 #{thumbnail_path}/thumbnail#{i}.jpg`

  This version of ffmpeg on my VM doesn't seem to care about the "-v 0" option. I've also tried "-loglevel quiet" which causes ffmpeg to error, indicating that the option isn't recognized (both loglevel and v work on my host machine's ffmpeg).

  Tried using both exec() and system(), which both caused execution to hang. Tried to redirecting output to a file by doing :

  `ffmpeg -v 0 -ss #{timestamp} -i #{video_file.path} -y -f image2 -vcodec mjpeg -vframes 1 -s 640*360 #{thumbnail_path}/thumbnail#{i}.jpg > #{thumbnail_path}/output.txt`

  Still see output. Next I tried :

  `ffmpeg -v 0 -ss #{timestamp} -i #{video_file.path} -y -f image2 -vcodec mjpeg -vframes 1 -s 640*360 #{thumbnail_path}/thumbnail#{i}.jpg &> dev/null`

  Still seeing output ! Finally I tried :

  $stdout.reopen("#{thumbnail_path}/output.txt", "w")
  
  $stderr.reopen("#{thumbnail_path}/error.txt", "w")
  
  `ffmpeg -v 0 -ss #{timestamp} -i #{video_file.path} -y -f image2 -vcodec mjpeg -vframes 1 -s 640*360 #{thumbnail_path}/thumbnail#{i}.jpg`
  
  $stdout = STDOUT
  
  $stderr = STDERR

  Holy cow, that worked ! Well, sort of. No more verbose output when running tests, BUT somehow anytime this runs I get kicked out of the rails console.

  Does anyone have a more elegant solution ?

• streaming webcam using ffmpeg and H.264

  4 avril 2014, par John Qualis

  I am new to ffmpeg. I am trying to stream my webcam live over the WAN to a ffserver by using ffmpeg and libx264 on a windows 7 64 bit machine.I have described my problem below. Can someone show me how to stream a webcam live using x264 and ffmpeg/ffserver ? Is it possible to do so ?

  I am using the following command :

   ffmpeg.exe -f dshow -i video="Webcam C170":audio="Microphone (3- Webcam C170)" 
  
   -an -vcodec libx264 -b:v 64k -threads 0 -r 25 -maxrate 2048k -bufsize 6000k   
  
    http://AA.BB.CC.DD:8090/feed1.ffm

  I get the followoing errors -

  [mpeg1video @ 049ec4e0] too many threads/slices (9), reducing to 8
  
  [libx264 @ 026999e0] broken ffmpeg default settings detected
  
  [libx264 @ 026999e0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 026999e0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 026999e0] speed presets are listed in x264 --help
  
  [libx264 @ 026999e0] profile is optional; x264 defaults to high
  
  
  
    Metadata:
  
      creation_time   : now
  
      Stream #0:0: Video: mpeg1video, yuv420p, 160x128, q=2-31, 64 kb/s, 1000k tbn, 30
  
  tbc
  
      Stream #0:1: Audio: pcm_mulaw, 22050 Hz, mono, s16, 176 kb/s
  
      Stream #0:2: Video: h264, yuv422p, 160x128, q=2-31, 64 kb/s, 1000k tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg1video)
  
    Stream #0:1 -> #0:1 (pcm_s16le -> pcm_mulaw)
  
    Stream #0:0 -> #0:2 (rawvideo -> libx264)
  
  **Error while opening encoder for output stream #0:2 - maybe incorrect parameters such
  
  as bit_rate, rate, width or height**
  
  [dshow @ 0269f640] real-time buffer 101% full! frame dropped!
  
  </profile></speed>

  Here is my ffserver.conf (relevant parts)

  <stream>
  
  
  
  # coming from live feed &#39;feed1&#39;
  
  Feed feed1.ffm
  
  Format mpeg
  
  
  
  # Bitrate for the audio stream. Codecs usually support only a few
  
  # different bitrates.
  
  AudioBitRate 32
  
  
  
  # Number of audio channels: 1 = mono, 2 = stereo
  
  AudioChannels 1
  
  AudioSampleRate 44100
  
  
  
  # Bitrate for the video stream
  
  VideoBitRate 64
  
  VideoBufferSize 40
  
  # Number of frames per second
  
  #VideoFrameRate 8
  
  #VideoFrameRate 40
  
  VideoFrameRate 3
  
  
  
  VideoSize 160x128
  
  VideoGopSize 12
  
  No Audio
  
  ACL: .....
  
  </stream>
  
  ...............
  
  ...............
  
   <stream>
  
   Format rtp
  
   Feed feed1.ffm
  
   VideoCodec libx264
  
   VideoFrameRate 15
  
   VideoBitRate 64
  
  #VideoSize 480x272
  
  # VideoSize 176x144
  
  #AVPresetVideo default
  
  #AVPresetVideo default
  
  #AVPresetVideo baseline
  
  #AVOptionVideo flags +global_header
  
  </stream>

• How to import FFMPEG Library in my maven project ?

  1er septembre 2021, par Georgi

  I have a Spring-boot project, where I am using the ffmpeg library, I am executing the ffmpeg commands through a ProcessBuilder(in the terminal/cmd) and everything works fine, because I have already installed the ffmpeg on my macOS. When I try to generate a jar and run it on an another machine, where ffmpeg is not installed, it is executed, everything works fine, except the ffmpeg comamnds. Is there any change to import the library to my maven project or somehow to use it ?
Is it a good idea to add an external jar of the library ?

  



  Thank you in advance !