char *format, char *codec, char *bsfilter, char *bsargs);
int get_encoder(FILE *fp,
char *format, char *codec, char *bsfilter, char *bsargs);
char *format, char *codec, char *bsfilter, char *bsargs);
int get_encoder(FILE *fp,
char *format, char *codec, char *bsfilter, char *bsargs);