[FFmpeg-user] Convert iPhone MOV to Android MP4

Thu Mar 9 00:06:26 EET 2017

The output I provided just happened to be one of the very few that used
AAC, and what I was using to compare bitrates. Most of my videos use
pcm_s16le, which I am understanding is not supported in MP4, and thus the
reason I am converting everything to AAC by default.

Example #2, input with pcm_s16le, input bitrate of 705 kb/s. Output bitrate
defaults to 69 kb/s. I would have expected the output bitrate to match that
of the input. Does AAC support that high of a bitrate?

ffmpeg version N-83749-g035e932 Copyright (c) 2000-2017 the FFmpeg
developers
  built with gcc 6.3.0 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va
--enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth
--enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
--enable-iconv --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm
--enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg
--enable-lzma --enable-zlib
  libavutil      55. 47.101 / 55. 47.101
  libavcodec     57. 82.100 / 57. 82.100
  libavformat    57. 66.103 / 57. 66.103
  libavdevice    57.  3.100 / 57.  3.100
  libavfilter     6. 74.100 /  6. 74.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '100APPLE\IMG_0010.MOV':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2016-07-19T18:42:38.000000Z
    com.apple.quicktime.content.identifier:
3118A852-CBA8-488D-9868-F883D5A19A73
    com.apple.quicktime.location.ISO6709: +31.7345-106.3326+1141.214/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 6s Plus
    com.apple.quicktime.software: 9.3.1
    com.apple.quicktime.creationdate: 2016-07-19T12:42:38-0600
  Duration: 00:00:02.67, start: 0.000000, bitrate: 8695 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc,
smpte170m/bt709/bt709), 1440x1080, 7965 kb/s, 12.38 fps, 15 tbr, 600 tbn,
1200 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2016-07-19T18:42:38.000000Z
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: pcm_s16le (lpcm / 0x6D63706C), 44100 Hz, mono,
s16, 705 kb/s (default)
    Metadata:
      creation_time   : 2016-07-19T18:42:38.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:2(und): Data: none (mebx / 0x7862656D), 43 kb/s (default)
    Metadata:
      creation_time   : 2016-07-19T18:42:38.000000Z
      handler_name    : Core Media Data Handler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'C:..\iPhone\DCIM\IMG_0010.MP4':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    com.apple.quicktime.creationdate: 2016-07-19T12:42:38-0600
    com.apple.quicktime.content.identifier:
3118A852-CBA8-488D-9868-F883D5A19A73
    com.apple.quicktime.location.ISO6709: +31.7345-106.3326+1141.214/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 6s Plus
    com.apple.quicktime.software: 9.3.1
    encoder         : Lavf57.66.103
    Stream #0:0(und): Video: h264 (High) ([33][0][0][0] / 0x0021),
yuvj420p(pc, smpte170m/bt709/bt709), 1440x1080, q=2-31, 7965 kb/s, 12.38
fps, 15 tbr, 19200 tbn, 600 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2016-07-19T18:42:38.000000Z
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz,
mono, fltp, 69 kb/s (default)
    Metadata:
      creation_time   : 2016-07-19T18:42:38.000000Z
      handler_name    : Core Media Data Handler
      encoder         : Lavc57.82.100 aac
frame=   27 fps=0.0 q=-1.0 Lsize=    2334kB time=00:00:02.67
bitrate=7160.8kbits/s speed=18.8x
video:2309kB audio:23kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.095816%
[aac @ 000000000048dfc0] Qavg: 110.545

On Wed, Mar 8, 2017 at 11:21 AM, Cley Faye <cleyfaye at gmail.com> wrote:

> 2017-03-08 17:56 GMT+01:00 Richard Duran <ricdur2 at gmail.com>:
>
> > From what I can tell of the following output, the input audio bitrate is
> 85
> > kb/s, and the output is 69 kb/s.
> >
> > I would like to know if it's possible to retain the source audio
> bitrate. I
> > am doing this via a batch file that loops through iPhone videos that have
> > varying bitrates.
> >
> >
> >
> > E:\> ffmpeg.exe -i 100APPLE\IMG_0075.MOV -vcodec copy -acodec aac
> > C:..\iPhone\DCIM\IMG_0075.MP4
> >
>
> Since your input already have aac audio, and you're already copying the
> video stream as-is, why not just "-codec copy" and be done with it?
>
> If you specify "-acodec aac" it will do a transcode, taking time, and use
> default values, which is obviously not what you want.
> Also, if you do want to transcode from aac to aac, there's no much point in
> trying to keep the same bitrate; it'll be lossy anyway.
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