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I have a mipsel executable (DvdPlayer from a RTD1283 firmware). I know that IDA is able to identify many functions. Then, I would like to generate a .sig file with signatures of these functions for use with other executable DVDPlayer (from other firmwares).
Would it be possible to convert the executable in a library ?
You can try the IDB_2_SIG plugin that generates signature files from the IDB itself.
One thing to note is that with gcc-built MIPS ELF files, many non-library symbols/function names (basically anything in a .o file) get entries in the dynamic symbol table and thus survive strip/sstrip as long as the binary is dynamically linked. So you probably won't need to generate signatures against this ELF in order to identify those same functions in similar ELF files from other DVDPlayer firmwares - they'll just be there and IDA will do its thing.
Yes, either use IDA's FLAIR tools or use one of the tools mentioned here: Tools to work cooperatively on the same binary
IIRC, you cannot generate a FLIRT signature from a non relocatable ELF binary. You may have better luck using BinDiff to export the function names and comments. If this is all you need it should be enough, I use it a lot for this very same purpose.
