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  • How to begin with FFMpeg - iPhone SDK

    21 décembre 2012, par max_

    I would really appreciate it if someone could point me towards beginning with FFMpeg. What I mean by this is could you point me towards a tutorial firstly on how to download and compile it, and secondly how to install it into my xcode project and use the library.

  • Problem in FFMPEG encoding decoding with IPhone os 4.3 SDK

    11 janvier 2012, par IPhoneUprise

    I want to convert my mov file (audio + video) in to mp4 to reduce file size in IPhone. I successfully compile FFMPEG libraries for armv7 for IPhone OS 4.3 sdk and i was able to decode and encode video frames in IPhone. Now my compressed file size reduced from 48 mb mov file to 2 mb mp4 file.But the audio is missing in compressed mp4 file, so now i am trying to decode and encode audio as well but i am getting issues to integrate this audio encode decode code with my existing code. If any one has any sample which shows how to encode decode audio with video that would be great.

  • 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 ?

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