Any library to convert a stereo MP3 file to MONO in Android?

I need to convert a stereo MP3 file into Mono under ANDROID with the help of any library. Please do not suggest me the option MONO in settings.
I want a library like LAME and totally free to use.
Anyone have experience with Blade on Android, I found some libs on Github for Blade-Android ports but that did not work, any suggestion is welcome

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Using Darktable, how to batch convert RAW to another supported format

After some explorations, it's actually quite simple. The process can be adapted to your own conversion needs, but I wanted the 8-bit TIFF format – the reason why it is not relevant.

  1. Open "Storage Options" in the "Light Table" section of Darktable, set the required parameters. For me, TIFF, 8-bit, uncompressed. Set the desired path for file export to disk and conflict options.

Storage options settings

  1. Select all the images you want to export / convert. Use CTRL and LMB to select multiple RAW images. For this test, I used the same RAW image with different file names (1300875350_fuji-x100-dscf5613.RAF, 2300875350_fuji-x100-dscf5613.RAF, 3300875350_fuji-x100-dscf5613.RAF). Unfortunately, you do not see it very well on screen capture, but I hope the reader will understand the strategy.

Custom selection of images to export

  1. You can also use the SELECT ALL option in the upper right of the human-readable user interface.

Quick and dirty selection of all options for export

  1. Click the EXPORT button in "Storage Options". – see step 1 above. Darktable will then export the files in TIFF (or other) format.

The result on the disc

I hope this will help others, like me, who want to convert a lot of RAW files to another format. Bravo!

Convert encryption with libsodium from Swift code to Java

I'm trying to implement encryption with the help of libsodium and I have a quick code that accomplishes it. I need to convert the fast code to java (for Android). The algorithm and encryption mode used are AES / GCM / NoPadding. I have trouble understanding the Swift code.

The code is as follows:

Foundation of importation
import libsodium
import CryptoSwift
import SwiftyJSON

PullPaymentHelper class {

// MARK: - Constants

leave KEY_LENGTH: UInt64 = 32
let IV_LENGTH: Int = 16
leave OPS_LIMITS: UInt64 = 10
let MEM_LIMITS: Int = 4000000
leave STATUS_SUCCESS: Int = 0

let VALUE_AAD: String = "SomeData"

let KEY_CIPHERB = "cipherb"
let KEY_ATAG = "atag"
let KEY_IV = "iv"
let KEY_SALT = "salt"

// MARK: - Methods of assistance

/// Derive the key from the private key and salt chain provided.
/// - Settings:
/// - privateKey: string value of the password
/// - saltStringBase64: base64 string of the salt value
/// - Returns: Byte array for the derived key
private func deriveKey (privateKey: String, saltBytes: [UInt8]) -> [UInt8]? {
let salt = Data (bytes: saltBytes)
leave passwordPointer = strdup (privateKey)

let modifiedKeyPointer = UnsafeMutablePointer.allocate (Ability: Int (KEY_LENGTH))

let status = crypto_pwhash_argon2i (
UInt64 (privateKey.count),
salt.toPointer (),
crypto_pwhash_argon2i_alg_argon2i13 ()

returns status == STATUS_SUCCESS
? Array (UnsafeMutableBufferPointer (start: derivativeKeyPointer, account: Int (KEY_LENGTH)))
: no

/// Generate a new key for the key provided.
/// - privateKey parameter: string value of the private key
/// - Returns: Touple having the salt and the generated key
private function generateNewKey (privateKey: String) -> (salt: [UInt8], key: [UInt8])? {
guard let salt = Data (randomOfLength: Int (KEY_LENGTH)),
let key = deriveKey (privateKey: privateKey, saltBytes: salt.bytes) else {
print ("Can not generate salt")
returns zero

return (salt: salt.bytes, key: key)

func encryptDataWithPrivateKey (privateKey: String, data: [String: Any]) -> String? {
let dataStringToBeEcrypted = JSON (data)

guard let iv = Data (randomOfLength: IV_LENGTH) ?. bytes
let encInfo = generateNewKey (privateKey: privateKey),
leave plainTxt = try? dataStringToBeEcrypted.rawData (). bytes
else {return nil}

let sel = encInfo.salt
let key = encInfo.key

Let gcm = GCM (
iv: iv,
additionalAuthenticatedData: VALUE_AAD.bytes,
mode: .detached

keep aes = try? AES (key: key, blockMode: gcm, fill: .pkcs7),
leave encryptedMessage = try? aes.encrypt (plainTxt),
let atag = gcm.authenticationTag else {return nil}

// All values ​​are encoded in base64 strings
leave encyptedData = [
            KEY_CIPHERB: encryptedMessage.toBase64(),
            KEY_SALT: salt.toBase64(),
            KEY_IV: iv.toBase64(),
            KEY_ATAG: atag.toBase64()

        back to try? JSON (encyptedData) .rawData (). Base64EncodedString ()

Using Darktable to batch convert RAW to 8bit lossless TIFF (uncompressed)

I've noticed that in other answers, there are ways to use the history stack in Darktable to batch convert a bunch of RAW images. However, since I only want to use Darktable convert (export) a lot of RAW images as 8bit uncompressed / lossless TIFF files, I wondered if that was possible.

Please help to convert conditional expressions to linear

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google sheets – Convert number and text to number

I have a spreadsheet in Google Sheets with data such as:
In sheet 1 in column price list

$ 100 in text
102 in number
$ 103 in text
104 in number
105 in number

When I make the vlookup and try to multiply it by 1, it indicates an error. Unable to understand how to make the change

I used this formula to convert text to number, but if the cell has a numeric format, it removes an error.

Formula used to convert text to number.
roundup (REGEXREPLACE (index (Sheet1! A: A, match (E3, Sheet1! A: A, 0), "),", "[$,*]"))

to make a free video hosting website, supporting ts file to download and automatically convert to MP4?

make a free video hosting website, supporting ts file to download and automatically convert to mp4, with a large HD TV file size ~ ~! ?? thank you all …

Convert from .rpm to .deb with alien

I'm trying to convert .rpm at .deb using the alien command:

sudo alien .rpm

But just create a directory that has the same name, but never get .deb to install it

There is no error when converting

How could I get .deb?

python 3.x – ValueError: Can not convert string to float: file

I have a matrix.txt file with the following matrix:

—————– matrix.txt ————

[[ 2.94795074e+00  3.15288849e-02 -8.67170450e+02]
 [-2.21123258e-17  2.94877180e+00 -5.95651904e+02]
 [ 1.49601560e-04  1.52843706e-04  1.00000000e+00]]

this is string and trying to convert it to float32 to multiply it by another matrix shows me this error …

file = open (& # 39; matrix.txt & # 39; r & # 39; r)
matrix_file_l = list ()
matrix_file_l = ()
matrix_file = np.array (matrix_file_l, dtype = "float32")

def mult_matrix (matrix1, matrix2):
matrixx = np.empty ([len(matrix1), len(matrix2[0])])
for i in the range (len (matrix1)):
for j in the range (len (matrix2[0])):
for k in the range (len (matrix2)):
matrixx[i][j]    + = matrix1[i][k]    * matrix2[k][j]
    return matrixx

matrix = mult_matrix (matrix_file, p_homo)

how to reverse in this case the matrix so that it keeps a format dtype = float32 and tamanno 3×3 thanks in advance and greetings