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

    13 janvier 2023, 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 ?

    


  • 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

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