Newest 'ffmpeg' Questions - Stack Overflow

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• How to convert a 5MB video to 2MB using ffmpeg [migrated]

  15 novembre 2013, par wilsonrufus

  Is it possible to convert a video of any file size x to a specific file size y ??

  I have a video test.mp4 which is 5mb i would like to set the size to 2mb

  Is it possible to get exact 2mb using ffmpeg

• Can't install FFMPEG on OS X Mavericks

  15 novembre 2013, par CristianOrellanaBak

  I have an error when install FFMPEG through homebrew on OS X Mavericks running this command brew install ffmpeg :

  Error: ffmpeg dependency x264 was built with the following
  C++ standard library: libstdc++ (from clang)
  
  This is incompatible with the standard library being used
  to build ffmpeg: libc++ (from clang)
  
  Please reinstall x264 using a compatible compiler.
  hint: Check https://github.com/mxcl/homebrew/wiki/C++-Standard-Libraries
  

  The complete history is : I has installed FFMPEG on Mountain Lion (that worked fine), but when upgrade it to Mavericks, FFMPEG fails to create an video in my Ruby on Rails app : Ruby on Rails : FFMPEG fails after upgrade Mountain Lion to Mavericks

  Some idea or recommendation??

  Thank you very much!

• RTSP to HTTP Live Streaming (iOS)

  15 novembre 2013, par user2964075

  I have RTSP feed coming from my IP Camera as my source input and need to publish it to HTTP Live Streaming (HLS) for playback on iOS devices. I have already tried RTSP-to-RTSP on iOS and it worked; this time I want to try RTSP-to-HLS. I already have Wowza and ffmpeg installed but I just don't know what commands I should run to produce HLS. I've googled for the right commands but I just couldn't find them. What should I run?

  Safari supports HLS. Does it also mean that UIWebView supports HLS as well?

• FFMPEG : from jpg to avi it's ok, but with bad size and quality

  14 novembre 2013, par user523129

  I have six .jpg images with a size 350x400 (WxH). I want to turn them into an avi file of a good quality (but not too heavy) and with same dimensions

  I'm doing:

  /var/www/html/folder/ffmpeg/ffmpeg -y -r 0.5 -i myfolder/434420image%05d.jpg -vcodec mpeg4 -s qcif -r 0.5 myfolder/434420img_tmp.avi
  

  And I'm having the avi file, but with a size of 127x142 and with a terrible resolution.

  What am I doing wrong?

  Thanks a lot

• How can I acheive the best overall FLV quality with FFMPEG ?

  14 novembre 2013, par dcolumbus

  First of all, FFMPEG has the worst documentation of all time, and secondly, the syntax is so trivial that it's often hard to understand what some lines are doing.

  What I'm looking to accomplish would be the best quality FLV with the lowest file size. After all, isn't that everyone's goal? These videos will be streamed if that makes any difference.

  Do any of you have some command lines that could do this?

  For now, my video(s) are no wider than 320px, and some are widescreen, so their heights are a little smaller than 240px. As it stands, the quality of the converted FLVs is quite poor.

  Current command:

  > ffmpeg -i video.mov -ar 22050 -ab 32 -f flv -s 320x240 -aspect 4:3 video.flv