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
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
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '100APPLE\IMG_0075.MOV':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2016-11-14T04:40:23.000000Z
com.apple.quicktime.location.ISO6709: +31.7344-106.3326+1142.097/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 6s Plus
com.apple.quicktime.software: 10.1.1
com.apple.quicktime.creationdate: 2016-11-13T21:40:23-0700
Duration: 00:00:03.84, start: -0.000023, bitrate: 11797 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709), 1920x1080, 11689 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc
(default)
Metadata:
rotate : 90
creation_time : 2016-11-14T04:40:23.000000Z
handler_name : Core Media Data Handler
encoder : H.264
Side data:
displaymatrix: rotation of -90.00 degrees
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 85 kb/s (default)
Metadata:
creation_time : 2016-11-14T04:40:23.000000Z
handler_name : Core Media Data Handler
Stream #0:2(und): Data: none (mebx / 0x7862656D), 5 kb/s (default)
Metadata:
creation_time : 2016-11-14T04:40:23.000000Z
handler_name : Core Media Data Handler
Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2016-11-14T04:40:23.000000Z
handler_name : Core Media Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'C:..\iPhone\DCIM\IMG_0075.MP4':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.quicktime.creationdate: 2016-11-13T21:40:23-0700
com.apple.quicktime.location.ISO6709: +31.7344-106.3326+1142.097/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 6s Plus
com.apple.quicktime.software: 10.1.1
encoder : Lavf57.66.103
Stream #0:0(und): Video: h264 (High) ([33][0][0][0] / 0x0021),
yuv420p(tv, bt709), 1920x1080, q=2-31, 11689 kb/s, 29.97 fps, 29.97 tbr,
19200 tbn, 600 tbc (default)
Metadata:
rotate : 90
creation_time : 2016-11-14T04:40:23.000000Z
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 : 2016-11-14T04:40:23.000000Z
handler_name : Core Media Data Handler
encoder : Lavc57.82.100 aac
frame= 115 fps=0.0 q=-1.0 Lsize= 5512kB time=00:00:03.85
bitrate=11715.4kbits/s speed=55.1x
video:5475kB audio:33kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.084008%
[aac @ 00000000004ab940] Qavg: 1297.159
On Wed, Mar 8, 2017 at 9:41 AM, Richard Duran <ricd...@gmail.com> wrote:
> I would've thought that this was a FAQ, but I have been unable to find it.
> I'm emailing this list because many solutions I find online still reference
> "-strict experimental" for AAC output.
>
> I would like to convert iPhone videos to MP4, and would like to retain the
> input audio bitrate and sampling rate. I had the impression that this would
> be the default behavior if the values weren't specified on the command
> line, but I've seen that this isn't the case.
>
> I will follow up this email with sample output.
>
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