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• How to pass bytesArray as input and output in command array for FFmpeg execute ?

  11 avril 2023, par Rohit gupta

  I was working with FFmpeg library where I was developing microphone-based reading and writeing the audioData, where i got the challenge to process some audioData. but i dont want to store the files as outputstream or something as it will add additional delays.

  


  This was my code that i used

  


  implementation 'com.arthenica:mobile-ffmpeg-full:4.2.2.LTS'


  


  private fun processAudioAsChipmunk(audioData: ShortArray, record: AudioRecord): ShortArray {
        val sampleRate = record.sampleRate
        val channels = record.channelCount
        val filter = "asetrate=2*${sampleRate},aresample=48000,atempo=2"
        val outputData = audioData
        val cmd = arrayOf(
            "-y",
            "-i",
            fileName1,  // here input filepath is passed, i want it to be ByteArray(audioData)
            "-af",
            "asetrate=22100,atempo=1/2",
            fileName2 //here output filepath is passed, i want it to be ByteArray(outputData)
        )//Chipmunk

        FFmpeg.execute(cmd)
        return outputData
    }



  


  Now i wanted to read and write the audioData without storing and using it as filenames.

  


  the below code shows the code i'm using to read and write audio Data

  


  read = record!!.read(audioData, 0, minBuffer) //AudioRecord
val processedAudioData = processAudioAsChipmunk(audioData, record!!) // Here! 
write = player!!.write(processedAudioData, 0, read) //AudioTrack


  


  Post thought ->

  


  I tried below code but again failed to pass input and output stream instead of filename inside executeAsync

  


  https://github.com/arthenica/ffmpeg-kit


  


  fun executeFfmpegCommand(audioData: ShortArray, rubberbandPitch: Float = 1.0f): ShortArray {
        // Convert short array to byte array
        val byteBuffer = ByteBuffer.allocate(audioData.size * 2)
        byteBuffer.order(ByteOrder.nativeOrder())
        for (i in audioData.indices) {
            byteBuffer.putShort(audioData[i])
        }
        val inputData = byteBuffer.array()

        // Set input data as input stream
        val inputStream = ByteArrayInputStream(inputData)

        // Create output stream to store output data
        val outputStream = ByteArrayOutputStream()

        // Add rubberband filter to command to make audio sound like chipmunk
        val rubberbandFilter = "rubberband=pitch=${rubberbandPitch}"
        val commandWithFilter = arrayOf("-f", "s16le", "-ar", "44100", "-ac", "2", "-i", "-", "-af", rubberbandFilter, "-f", "s16le", "-")

        // Create ffmpeg session
        val session = FFmpegKit.executeAsync() // @!! HOW TO PASS CommandFilter, inputStream, outPutStream here !!@

        // Wait for session to complete
        session.wait()

        // Check if session was successful
        if (ReturnCode.isSuccess(session.returnCode)) {
            Log.e("FFmpeg", "FFmpeg execution failed with return code: ${session.returnCode}")
            return ShortArray(0)
        }

        // Convert output stream to short array
        val outputData = outputStream.toByteArray()
        val shortBuffer = ByteBuffer.wrap(outputData)
            .order(ByteOrder.nativeOrder())
            .asShortBuffer()
        val outputShortArray = ShortArray(shortBuffer.remaining())
        shortBuffer.get(outputShortArray)

        // Return output short array
        return outputShortArray
    }



  


• How to use ffmpeg to record audio from a video for first 10 seconds in Python

  13 novembre 2022, par S Andrew

  I have RTSP stream coming from a camera which also has audio. My goal is to save the audio. To do this, I have below code :

  


  import ffmpeg&#xA;ffmpeg.input("rtsp://john:<pwd>@192.168.10.111:5545/Streaming/Channels/291/").output("test.wav", map="0:a:0").run&#xA;</pwd>

  


  When I terminate the Python script, it saves the test.wav file which has just the audio from the rtsp stream. Now I am trying to save the first 10 sec from the stream into 1 file and then the next 10sec in another file and then it keeps on going until terminated.

  


  To do this, I have thought of putting the ffmpeg stream in a separate thread and to schedule that thread to run every 10 sec. This way a new stream will create which will save the audio for 10sec and will exit, and then this keeps on going. But to achieve this, I need to know how can we just save the initial 10 sec from the stream.

  


• How to use ffmpeg to record audio from a video for first 10seconds in Python

  2 novembre 2022, par S Andrew

  I have rtsp stream coming from a camera which also has audio. My goal is to save the audio. To do this, I have below code :

  


  import ffmpeg&#xA;ffmpeg.input("rtsp://john:<pwd>@192.168.10.111:5545/Streaming/Channels/291/").output("test.wav", map="0:a:0").run&#xA;</pwd>

  


  When I terminate the python script, it saves the test.wav file which has just the audio from the rtsp stream. Now I am trying to save the first 10sec from the stream into 1 file and then the next 10sec in another file and then it keeps on goining untill terminated.

  


  To do this, I have thought of putting the ffmpeg stream in a seprate thread and to schedule that thread to run every 10 sec. This way a new stream will create which will save the audio for 10sec and will exit, and then this keeps on going. But to achieve this, I need to know how can we just save the intial 10 sec from the stream. Please help thanks.