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• Using FFMPEG to reliably convert videos to mp4 for iphone/ipod and flash players

  23 avril 2016, par Jake Stevenson

  I need to convert videos for use in both a flash player and the iphone/ipod touch. I’m using the following batch script with ffmpeg :

  @echo off
  
  ffmpeg.exe -i %1 -s qvga -acodec libfaac -ar 22050 -ab 128k -vcodec libx264 -threads 0 -f ipod %2

  This always outputs an mp4 file, and I can always play it on my PC. The videos also seem to play fine on my iphone 3GS. But with some input files it won’t work for older iphone versions (3G and iPod touch).

  Here’s the ffmpeg output from one such file :

  D:\ffmpeg>encode.bat d:\temp\recording.flv d:\temp\out.m4v
  
  FFmpeg version SVN-r18709, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --enable-memalign-hack --prefix=/mingw --cross-prefix=i686-ming
  
  w32- --cc=ccache-i686-mingw32-gcc --target-os=mingw32 --arch=i686 --cpu=i686 --e
  
  nable-avisynth --enable-gpl --enable-zlib --enable-bzlib --enable-libgsm --enabl
  
  e-libfaac --enable-libfaad --enable-pthreads --enable-libvorbis --enable-libtheo
  
  ra --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libxvid -
  
  -enable-libschroedinger --enable-libx264
  
    libavutil     50. 3. 0 / 50. 3. 0
  
    libavcodec    52.27. 0 / 52.27. 0
  
    libavformat   52.32. 0 / 52.32. 0
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    built on Apr 28 2009 04:04:42, gcc: 4.2.4
  
  [flv @ 0x187d650]skipping flv packet: type 18, size 164, flags 0
  
  Input #0, flv, from 'd:\temp\recording.flv':
  
    Duration: 00:00:07.17, start: 0.001000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  [libx264 @ 0x13518b0]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE
  
  4.2
  
  [libx264 @ 0x13518b0]profile Baseline, level 4.2
  
  Output #0, ipod, to 'd:\temp\out.m4v':
  
      Stream #0.0: Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 1k tbn, 1k
  
  tbc
  
      Stream #0.1: Audio: libfaac, 22050 Hz, mono, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop encoding
  
  frame=   90 fps=  0 q=-1.0 Lsize=     128kB time=6.87 bitrate= 152.4kbits/s
  
  video:92kB audio:32kB global headers:1kB muxing overhead 2.620892%
  
  [libx264 @ 0x13518b0]slice I:8     Avg QP:29.62  size:  7047
  
  [libx264 @ 0x13518b0]slice P:82    Avg QP:30.83  size:   467
  
  [libx264 @ 0x13518b0]mb I  I16..4: 17.9%  0.0% 82.1%
  
  [libx264 @ 0x13518b0]mb P  I16..4:  0.6%  0.0%  0.0%  P16..4: 23.1%  0.0%  0.0%
  
   0.0%  0.0%    skip:76.3%
  
  [libx264 @ 0x13518b0]final ratefactor: 57.50
  
  [libx264 @ 0x13518b0]SSIM Mean Y:0.9544735
  
  [libx264 @ 0x13518b0]kb/s:8412.6

  My suspicion is that it has something to do with the audio encoding. If so, does anyone know how to force it to reencode the audio to the proper format ?

  Any other ideas ?

• FFmpeg video encoding from iPhone to URL

  20 septembre 2016, par Nicolai Harbo

  I ran into a problem - I’m building an app, which I would like to be able to livestream. I have found a supplier, that I want to use - "all" he needs me to do, is to encode the video from the camera, to ffmpeg, and call his API. The thing is, I have no clue how to encode the video to ffmpeg. I have tried several google searches, and lots of different SDK’s for videostreaming, but it doesnt seem to help in my case.

  I know about Wowza and other livestream providers, but they cant deliver what I want, so I think this is my last option.
  So if any of you guys out there, can help me with encoding video from the camera into ffmpeg and send it to a API, please let me know how :-)
  It could be, that there’s a pod out there that i’ve overseen..

  Thanks in advance,
  /Nicolai

• Trying to compile x264 and ffmpeg for iPhone - "missing required architecture arm in file"

  4 août 2012, par jtrim

  I'm trying to compile x264 for use in an iPhone application. I see there are instructions on how to compile ffmpeg for use on the platform here : http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html , but I can't seem to find anything this complete for compiling x264 on the iPhone. I've found this source tree : http://gitorious.org/x264-arm that seems to have support for the ARM platform.

  Here is my config line :

  ./configure —cross-prefix=/usr/bin/ —host=arm-apple-darwin10 —extra-cflags="-B /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.2.sdk/usr/lib/ -I /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.2.sdk/usr/lib/"
  

  ...and inside configure I'm using the gas-preprocessor script (first link above) as my assembler :

  gas-preprocessor.pl gcc
  

  When I start compiling, it chunks away for a little while, then it spits out these warnings and a huge list of undefined symbols :

  ld : warning : option -s is obsolete and being ignored
  ld : warning : -force_cpusubtype_ALL will become unsupported for ARM architectures
  ld : warning : in /usr/lib/crt1.o, missing required architecture arm in file
  ld : warning : in /usr/X11R6/lib/libX11.dylib, missing required architecture arm in file
  ld : warning : in /usr/lib/libm.dylib, missing required architecture arm in file
  ld : warning : in /usr/lib/libpthread.dylib, missing required architecture arm in file
  ld : warning : in /usr/lib/libgcc_s.1.dylib, missing required architecture arm in file
  ld : warning : in /usr/lib/libSystem.dylib, missing required architecture arm in file
  Undefined symbols :
  

  My guess would be that the problem has to do with the "missing required architecture arm in file" warning...any ideas ?