On 01/22/2015 10:23 AM, Moritz Barsnick wrote:
On Thu, Jan 22, 2015 at 10:08:35 -0700, jd1008 wrote:
it does the conversion, but does not honour the bitrate param.
How do I force the bitrate param for the ourput?
You didn't show us the output of your ffmpeg command.
Anyway, your approach is wrong. The bitrate of a WAV file is defined by
its sample format, sample rate, and number of channels (except for
non-PCM WAV, which is not selected by default).
The default is probably pcm_s16le, which means 16 bits per sample per
channel. Therefore you can mathematically influence this with "-ac M"
and "-ar N", or by actually selecting the desired sample format.
Moritz
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Sorry!! I did not know that info was needed. Here it is for track1.
I tried with the params: -ac 2 -ar 44.1k -ab 1600k but to no avail.
----------------------------------
ffmpeg version N-51556-ge278500 Copyright (c) 2000-2013 the FFmpeg
developers
built on Apr 4 2013 05:11:43 with gcc 4.6 (Debian 4.6.3-1)
configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32
--extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static'
--extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static'
--extra-libs='-lxml2 -lexpat -lfreetype' --enable-static
--disable-shared --disable-ffserver --disable-doc --enable-bzlib
--enable-zlib --enable-postproc --enable-runtime-cpudetect
--enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis
--enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype
--enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-version3 --enable-libvpx
libavutil 52. 24.100 / 52. 24.100
libavcodec 55. 2.100 / 55. 2.100
libavformat 55. 1.100 / 55. 1.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 49.100 / 3. 49.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[mp3 @ 0x98b4700] max_analyze_duration 5000000 reached at 5015510
microseconds
Input #0, mp3, from 'trak1.mp3':
Metadata:
album : none
title : track1
genre : instructional
artist : me
track : 01
date : 2014
Duration: 00:08:54.57, start: 0.000000, bitrate: 321 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Stream #0:1: Video: mjpeg, yuvj444p, 600x600 [SAR 100:100 DAR 1:1],
90k tbr, 90k tbn, 90k tbc
Metadata:
title :
comment : Cover (front)
Output #0, wav, to 'trak1.wav':
Metadata:
IPRD : trak1
INAM : trak1
IGNR : Instructional
IART : me
IPRT : 01
ICRD : 2014
ISFT : Lavf55.1.100
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mp3 -> pcm_s16le)
Press [q] to stop, [?] for help
size= 15075kB time=00:01:27.53 bitrate=1410.8kbits/s ^Msize=
30114kB time=00:02:54.83 bitrate=1411.0kbits/s ^Msize= 45162kB
time=00:04:22.19 bitrate=1411.1kbits/s ^Msize= 60201kB
time=00:05:49.49 bitrate=1411.1kbits/s ^Msize= 75245kB
time=00:07:16.81 bitrate=1411.1kbits/s ^Msize= 90257kB
time=00:08:43.96 bitrate=1411.1kbits/s ^Msize= 92084kB
time=00:08:54.56 bitrate=1411.1kbits/s ^M
video:0kB audio:92084kB subtitle:0 global headers:0kB muxing overhead
0.000320%
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