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I'm looking for a way to simply concatenate podcasts episodes from a RSS feed into a single audio file.
I'm looking for cool features like adding 2 seconds of silence between each episode, or specify when to cut to skip credits, etc.
Do you know some editors that can do it, either on Windows or Linux, or should I handle this myself with some ffmpeg commands?
The simplest way is just to use the Unix cat command like
cat podcast1.mp3 podcast2.mp3 podcast3.mp3 > megacast.mp3
MP3 files are just audio and any headers or MP3 tags in the other files will just be a microsecond of static if you can hear it at all.
You could also record 2s of silence with Sound Recorder into silence.mp3 and use
cat podcast1.mp3 silence.mp3 podcast2.mp3 silence.mp3 podcast3.mp3 > megacast.mp3
If you want to get fancy, you could skip the beginning/end of a podcast with
tail -c +1000 podcast1.mp3 > trimmed.mp3
where -c means use bytes and +1000 is the number of bytes. You'd have to experiment with the number of bytes to find how long the intro is. To trim the end, use
head -c -1000 podcast1.mp3 > trimmed.mp3
and experiment with the number 1000. Run tail --help and head --help to see useful suffixes for the bytes like kb, mb, etc.
GStreamer would be the way to go but I doubt that it would fit your requirement of "simple". Whilst it will certainly do what you want it to do, the learning curve can be quite steep, although that said, there is a mountain of documentation out there for it.
you can use Audacity to concatenate multiple audio files, but as far as I know all the manipulations you described must be done manually.
