[mythtv-users] mpeg2 to audio conversion

[Jon Larson]

M L Truscott wrote:
> On Thursday 20 September 2007 16:23:59 Jon Larson wrote:
>   
>> David Watkins wrote:
>>     
>>> On 20/09/2007, M L Truscott <mltruscott at btinternet.com> wrote:
>>>       
>>>> I have some mpeg2 files from dvb radio I'd like to strip the video
>>>> stream from and store as oggs/mp3s.
>>>>
>>>> Any one know of a way of doing it?
>>>>         
>>> I've used this in the past to strip audio to a wav.  Should be easy
>>> enough to get to mp3 or ogg from there.
>>>
>>> mplayer infile.mpg -vo null -ao pcm:file=outfile.wav
>>>       
>> The following ffmpeg command will capture audio from an mpeg2 source and
>> save it as low-bitrate mp3. It is optimized for voice, so if your radio
>> recordings are music you should raise the -ab and -ar values to 192 (in
>> kbits) and 44100 in Hz), and remove the '-ac 1' option.
>>
>> ffmpeg -v quiet -y -i infile -ab 32 -acodec mp3 -ar 22050 -ac 1 outfile.mp3
>>
>> Jon
>>     
>
> I tried the above and this was the result:
>
>  ffmpeg -v quiet -y -i /myth/1708_20070920175900.mpg -ab 193 -acodec mp3 -ar 
> 44100 /myth/content/Music/Doctor_Who.mp3
> FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2004 Fabrice Bellard
>   
> configuration:  --enable-gpl --enable-pp --enable-pthreads --enable-vorbis --enable-libogg --enable-a52 --enable-dts --enable-libgsm --enable-dc1394 --disable-debug --enable-mp3lame --enable-faadbin --enable-faad --enable-faac --enable-xvid --enable-x264 --enable-amr_nb --enable-amr_wb --enable-shared --prefix=/usr 
>   libavutil version: 0d.49.0.0
>   libavcodec version: 0d.51.11.0
>   libavformat version: 0d.50.5.0
>   built on Mar 21 2007 14:14:05, gcc: 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
> Stream mapping:
>   Stream #0.0 -> #0.0
> Error while opening codec for output stream #0.0 - maybe incorrect parameters 
> such as bit_rate, rate, width or height
>
> I've clearly missed something - any help please?
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>   

You set "-ab 193" --it should be "-ab 192"

Jon
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