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• ffmpeg converts .flv video to .gif with awful quality [migrated]

  22 février 2013, par Kamil Hismatullin

  I'm converting .flv movie to .gif file with ffmpeg.

  ffmpeg -i input.flv -ss 00:00:00.000 -pix_fmt rgb24 -r 10 -s 320x240 -t 00:00:10.000  output.gif

  It works great, but output gif file has a very law quality.

  Any ideas how can I improve quality of converted gif ?

  Output of command :

  $ ffmpeg -i input.flv -ss 00:00:00.000 -pix_fmt rgb24 -r 10 -s 320x240 -t 00:00:10.000  output.gif 
  
  
  
  ffmpeg version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jan 24 2013 14:52:53 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.flv':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2013-02-14 04:00:07
  
    Duration: 00:00:18.85, start: 0.000000, bitrate: 3098 kb/s
  
      Stream #0.0(und): Video: h264 (High), yuv420p, 1280x720, 2905 kb/s, 25 fps, 25 tbr, 50 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 192 kb/s
  
      Metadata:
  
        creation_time   : 2013-02-14 04:00:07
  
  [buffer @ 0x92a8ea0] w:1280 h:720 pixfmt:yuv420p
  
  [scale @ 0x9215100] w:1280 h:720 fmt:yuv420p -> w:320 h:240 fmt:rgb24 flags:0x4
  
  Output #0, gif, to 'output.gif':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2013-02-14 04:00:07
  
      encoder         : Lavf53.21.1
  
      Stream #0.0(und): Video: rawvideo, rgb24, 320x240, q=2-31, 200 kb/s, 90k tbn, 10 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=  101 fps= 32 q=0.0 Lsize=    8686kB time=10.10 bitrate=7045.0kbits/s dup=0 drop=149    
  
  video:22725kB audio:0kB global headers:0kB muxing overhead -61.778676%

  Thanks.

• Kill a process started by exec() after some duration and store frames in an array

  19 février 2013, par asprin

  Let me start off by saying that I'm completely new to Java. I'm from PHP background, but it so happens that one of my PHP tasks need to be converted into Java.

  The task is splitting a video into frames using ffmpeg and then working with those frames. I've completed this process in PHP. And now I can to convert it into Java.

  I went over some tutorials and have got the bases covered (Using IDE, Running a java program etc). I'm using Eclipse for this purpose.

  I've so far managed to start ffmpeg from withing a java program by using

  public static void main(String[] args) throws IOException {
  
  
  
      String livestream = "D:/video.mpg";
  
      String folderpth = "D:/frames";
  
      String cmd="D:/ffmpeg/bin/ffmpeg.exe -i "+ livestream +" -r 10 "+folderpth+"/image%d.jpg";
  
  
  
      //System.out.println(cmd);
  
      Runtime r = Runtime.getRuntime();
  
      Process p = r.exec(cmd); // this starts creating frames
  
     // and stores them on local disk
  
     // any way to store that frame name in array?
  
     // something like String[] frames = {"image%d.jpg"}
  
     // so that frames array contains image1.jpg, image2.jpg..and so on?
  
  
  
  }

  This is working fine, I'm getting the frames in the folder. Now what I want to do is kill the process after some, say 5 minutes, as the video is over 2 hours long and I don't want to have to go to the taskbar and kill the process manually. I also would like to know if there is a way to store the frame names created by ffmpeg into an array for future use.

  I tried using p.destroy() but that didn't stop the process at all. How would I go about using something similar like setTimeout() which is used in jQuery ?

  Some Metadata

  OS : Windows 7

  IDE : Eclipse

• How to grab voice and video in ffmpeg/mplayer/mencoder ? [closed]

  4 février 2013, par Kill Kill

  My target is to grab voice and video via webcamera.
  There are three ways to do :

  1.ffmpeg

  ffmpeg -f oss -i /dev/dsp -f video4linux2 -r 25 -b 500000 -s 320x240 -i /dev/video0 out.mpg  
  
  WARNING: gnome-keyring:: couldn't connect to: /home/debian/.cache/keyring-4Hzs4r/pkcs11: No such file or directory  
  
  ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav developers  
  
  built on Jan 13 2013 16:02:15 with gcc 4.7.2  
  
  *** THIS PROGRAM IS DEPRECATED ***  
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.  
  
  [oss @ 0x9d63c60] /dev/dsp: No such file or directory  
  
  /dev/dsp: Input/output error

  in my computer how to revise it ?

  2.mplayer :

  mplayer tv:// -tv driver=v4l2:input=0:width=640:height=480:fps=25 -vo x11  

  I can see the video when the command run, how can I save the output into a file and grab the voice ?

  3.mencoder :

  mencoder tv:// -tv driver=v4l2:width=800:height=600:device=/dev/video0:fps=30:outfmt=yuy2:forceaudio:alsa:adevice=hw.2,0 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800 -ffourcc xvid -oac mp3lame -lameopts cbr=128 -o output.avi  
  
  
  
  MEncoder svn r34540 (Debian), built with gcc-4.7 (C) 2000-2012 MPlayer Team  
  
  success: format: 9 data: 0x0 - 0x0  
  
  TV file format detected.  
  
  Selected driver: v4l2  
  
  name: Video 4 Linux 2 input  
  
  author: Martin Olschewski   
  
  comment: first try, more to come   
  
  v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.  
  
  Selected device: PC Camera  
  
  Capabilities: video capture read/write streaming  
  
  supported norms:  
  
  inputs: 0 = zc3xx;  
  
  Current input: 0  
  
  Current format: unknown (0x4745504a)  
  
  tv.c: norm_from_string(pal): Bogus norm parameter, setting default.  
  
  v4l2: ioctl enum norm failed: Inappropriate ioctl for device  
  
  Error: Cannot set norm!  
  
  Selected input hasn't got a tuner!  
  
  ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card  
  
  Error opening audio: No such file or directory  
  
  ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card  
  
  Error opening audio: No such file or directory  
  
  ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card  
  
  Error opening audio: No such file or directory  
  
  v4l2: ioctl set mute failed: Invalid argument  
  
  v4l2: 0 frames successfully processed, 0 frames dropped.  
  
  ============ Sorry, this file format is not recognized/supported =============  
  
  === If this file is an AVI, ASF or MPEG stream, please contact the author! ===  
  
  Cannot open demuxer.  
  
  
  
  Exiting...