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• How to view the commands while making FFmpeg ?

  28 décembre 2011, par Saptarshi Biswas

  When I make ffmpeg, I can see following lines

  CC  ffmpeg.o
  LD  ffmpeg_g
  CP  ffmpeg
  STRIP   ffmpeg
  

  What is a quick way to find the commands for CC, LD etc. with as less modification to the Makefile?

• How to create a video from png images using ffmpeg

  28 décembre 2011, par Rajat

  I want to create a video from different png images. My code is:

  ffmpeg -r 20 -f image2 -i slideshow/%d.png -y -s 320x240 -aspect 4:3 out.mp4
  

  and i receive output:

  FFmpeg version SVN-r26400, Copyright (c) 2000-2011 the FFmpeg developers
    built on Sep 27 2011 00:47:07 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50)
    configuration: --enable-avfilter --enable-filter=fade
    libavutil     50.36. 0 / 50.36. 0
    libavcore      0.16. 1 /  0.16. 1
    libavcodec    52.108. 0 / 52.108. 0
    libavformat   52.93. 0 / 52.93. 0
    libavdevice   52. 2. 3 / 52. 2. 3
    libavfilter    1.74. 0 /  1.74. 0
    libswscale     0.12. 0 /  0.12. 0
  Input #0, image2, from 'slideshow/%d.png':
    Duration: 00:00:00.25, start: 0.000000, bitrate: N/A
      Stream #0.0: Video: png, rgb24, 720x471, 20 fps, 20 tbr, 20 tbn, 20 tbc
  [buffer @ 0x9687230] w:720 h:471 pixfmt:rgb24
  [scale @ 0x9687600] w:720 h:471 fmt:rgb24 -> w:320 h:240 fmt:yuv420p flags:0xa0000004
  Output #0, mp4, to 'out.mp4':
    Metadata:
      encoder         : Lavf52.93.0
      Stream #0.0: Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 20 tbn, 20 tbc
  Stream mapping:
    Stream #0.0 -> #0.0
  Press [q] to stop encoding
  Segmentation fault
  

  What might be the problem? Please help... Currently i am using centos 5 server.

• Maintain aspect ratio when converting video ? - ffmpeg

  27 décembre 2011, par RadiantHex

  I'm trying to convert movies from .avi to an iphone readable format wherever I look, people suggest the following options for ffmpeg

  ffmpeg -s 320x240 -aspect 320:240 [...]

  This does not bode well for videos with a different aspect ratio!

  ---

  How can I keep the aspect ratio from changing? Is there a way to set the size dynamically?

  e.g. have the height to be 240 and the width variable?

• onLowMemory caused in Android

  27 décembre 2011, par Satheesh

  Am developing a live wallpaper application in android. I face problem of onLowMemory. My application runs quite normally for 5 or odd minutes in the device after that causing the low memory error and its quit and restart again. How to resolve this error.

• Undefined reference to _aacplusEncOpen

  26 décembre 2011, par Tarun

  Following is the copy of my config.log file->

  http://pastebin.com/embed_js.php?i=UyTBTTZv

  Following is copy of configure file->

  http://pastebin.com/embed_js.php?i=2c15zppN

  One more thing..As of now I am trying to cross-compile ffmpeg on ubuntu,But If I just compile it for linux..The same command doesnt gives any error and executes smoothly and then I am able to get ffmpeg with aacplus support for my linux machine, But why the problem is coming when I am cross compiling it.

  Another thing as aacplus is not on by default, If in configuration I dont put any (off by default) library support like if I remove aacplus from it, Then also it goes smoothly.

  Help please ASAP