General pipeline composition for decoding (almost) anyvideo containers and re-decode it into mp4 with h264 video and mp3 audio

[mapcol]

So far I have worked mostly by copying pieces of code from the internet and
try them and keep what worked but I need a more wider and general
understanding of video decoding and gstreamer.

*I need a pipeline to decode the most common video containers and re-encode
them into mp4*
As far as I have understood so far on media encoding theory, this pseudo
pipeline should work:

filesrc --> DEMUXER(matroskademux, qtdemux, ...) --> branch1 and branch2

branch1 (audio) --> PARSER (aacparse, mp3parse, ...) --> DECODER (faad,
maad, ...) --> ENCODER --> (lamemp3enc) --> MERGE_BRANCH


branch2 (video) --> PARSER(h264parse, ..., ...) --> DECODER(ffdec_h264) -->
ENCODER (x264enc) --> MERGE_BRANCH

MERGE_BRANCH (final branch) --> MUXER(mp4mux) --> filesink

----------------------------------------------------------------------------------------------------------------------
The point is: to correctly transform my audio and video I need 
- a parser
- a decoder
- an encoder
... right?

At the end I can just merge everything into a unique mp4 file.

This must work perfectly for any video container format. All metadata must
be preserved. The final files must be correctly readable and ready to be
played and streamed.


Can you please correct any mistake I might have made? Am I missing any
element, any piece of pipeline?





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