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• compiling ffmpeg for iPhone SDK 4.3 [error : is unable to create an executable file.]

  12 février 2012, par user509020

  Like many others.. I'm compiling ffmpeg using gas preprocessor

  http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/077701.html

  This is my command

  ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk --enable-cross-compile --target-os=darwin --arch=arm7 --cpu=cortex-a8 --enable-pic

  the error :

  /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 is unable to create an executable file.
  
  C compiler test failed.

  I looked up the /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ folder using Finder..
  arm-apple-darwin10-gcc-4.2.1 was there..

  Thanks,
  Suhas

• How to change stream metadata with ffmpeg ?

  13 juillet 2012, par Igor Grinfeld

  I have many video files and part of it have wrong size, or at least ffmpeg reports wrong size.
  For example, ffmpeg prints :

   Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isom
  
      creation_time   : 2009-10-11 15:04:33
  
      encoder         : HandBrake 0.9.3 2008112300
  
   Duration: 01:47:42.18, start: 0.000000, bitrate: 663 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x464 [
  
  SAR 43:36 DAR 215:116], 499 kb/s, 25 fps, 25 tbr, 48k tbn, 50 tbc
  
   Metadata:
  
      creation_time   : 2009-10-11 15:04:33
  
      handler_name    :
  
   Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 159
  
  kb/s
  
   Metadata:
  
       creation_time   : 2009-10-11 15:04:33
  
       handler_name    :

  However, when I configure media player to play the file without resizing it has 860x464 size.

  I want to write scripts that will fix the files, but I don't know how to do that. I've updated to last ffmpeg version and tried to use -metadata:s:v:0 Video="...860x464...", as I read in ffmpegh doc, but it doesn't work.
  What is my mistake ?

• ffmpeg usage to encode a video to H264 codec format

  20 août 2015, par goldenmean

  I have a *.mp4 video file(MPEG4 video codec) and I am trying to convert this to a H264 video codec format(raw h.264 format) using ffmpeg on Linux(Version - FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard,) using command line as shown below,

  ffmpeg -i input .mp4 output.h264 

  but I get an error saying -

  Unsupported codec for output stream #0.0

  Then when i try this option :

  ffmpeg -i input .mp4 -formats h264 output.h264 

  it still does not work, and gives -

  Seems stream 0 codec frame rate differs from container frame rate: 59.94 (5994/100) -> 29.97 (30000/1001)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Rapture.mp4':
  
    Duration: 00:02:06.44, start: 0.000000, bitrate: 26574 kb/s
  
      Stream #0.0(eng): Video: h264, yuv420p, 1920x1080, 29.97 tbr, 29.97 tbn, 59.94 tbc
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16

  And then it prints out help on the formats which we get when we do ffmpeg -formats

  When I checked the help, ffmpeg -formats, I see below information related to H264 file format and codec :

  File format : 
  
  
  
  DE h264            raw H.264 video format
  
  
  
  Codecs:
  
  
  
  D V D  h264         H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

  My questions :

  1. How can I convert the video to a H264 encoded video (raw H264 video format)

  2. When I do ffmpeg -formats, I see many acronyms for the codecs supported, I see many acronyms before the codec name/type such as - D V D S E A, what do they stand for ?

  3. How to use the ffmpeg options -vcodec and -formats ?