On 03/26/2013 05:23 PM,
joe@actionline.com wrote:
> Alternatives for converting MP4 to MP3 and editing?
>
> #1. What is the best/easiest/most-efficient way to
> convert an mp4 video file to an mp3 audio file?
>
> #2. Is anyone using 'avconv'? What would a suitable
> syntax be to use that?
Using avconv to strip the audio of video, convert it to mp3 and put in a
file is easy. Just run:
avconv -i your_video.mp4 output_audio.mp3
avconv will then re-encode the file to mp3. The problem is that you
will get some loss of quality. A better way to do it is to figure out
what kind of audio the mp4 has in it to begin with using avprobe
avprobe your_video.mp4
you will get a bunch of output, but what you are looking for is the
lines that begin with "Stream" an in particular Stream, then Audio, like
this:
Stream #0.0(und): Video: h264 (Main), yuv420p, 1280x720 [PAR 1:1
DAR 16:9], 3111 kb/s, 29.48 fps, 90k tbr, 90k tbn, 180k tbc
Metadata:
creation_time : 2012-12-10 23:34:12
Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 159 kb/s
add -codec copy
Look at the Stream... Audio line and just after Audio: is the codec used
to compress the audio in your file. Mp4's usually have aac format audio.
To get a raw output of exactly what is encoded in the video file just
add "-codec copy" to the options of your avconv command and change the
output file name to the codec you got out of avprobe.
So for the video with the above stream I would run:
avconv -i your_video.mp4 -codec copy output_audio.aac
Not only will this give you an exact copy, but since it doesn't have to
re-encode, it will finish, much much faster.
> #3. What Linux tool offers the easiest/most-efficient
> way to edit (shorten) an audio file?
Just load the file into audacity, select what you don't want to be in
the file and press the delete key. When done, make sure you export your
file so that you can get it into the end format that you want. Just
doing a save in audacity, saves the file in audacitie's own format.
> Is there some significant advantage to the .ogg format?
Ogg is a free format, and you will usually get a slightly better audio
quality for a similar size as mp3. The biggest problem is that of
support. If you will be floating your files around, not everyone will
be able to play it. That being said, pretty much everyone has an ogg
player these days since just about every web browser supports ogg.
Brian Cluff
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