Newest 'ffmpeg' Questions - Stack Overflow

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  • How to resize video using ffmpeg on centos

    31 octobre 2013, par dungnguyen

    Please help me resize my video on centos with ffmpeg. Im trying using command

    ffmpeg -i input.avi -filter:v scale=720:-1 -acodec copy output.mkv

    but it failed. it is not display the image, only audio :(.

  • Trying to use FFMPEG in C using Codeblocks IDE under Windows 8.1

    31 octobre 2013, par obelix

    I have been trying to use FFMPEG in C using Codeblocks IDE under Windows 8.1. I've done the linking stuff required in order to make my code compile but i get the following error:

    C:\Users\user\Desktop\MScProject\FFmpegTest2\main.c|82|error: 'CODEC_TYPE_VIDEO' undeclared (first use in this function)|

    The source i use is the one from the following tutorial http://dranger.com/ffmpeg/tutorial01.c

    (original link: http://dranger.com/ffmpeg/tutorial01.html)

    Any ideas ?? Thanks in advance !! (btw the same thing happens when i am trying to compile the program in ubuntu)

  • How can I convert a text file to audio (mp3) using ffmpeg on Ubuntu 11.04 ?

    31 octobre 2013, par nwaomachux

    I would like to output .mp3 file from a text file on Ubuntu 11.04, using ffmpeg. Please, how do I do this? The best I could output is a .wav file. I intend to be able to use it in a Python file.

    My output method for .wav is espeak -s 155 -a 200 -f details.txt -w details.wav

  • In Android, how can I display mp4 files captured by Android itself without having "sorry this video cannot be played" trouble ?

    31 octobre 2013, par fercis

    I am new in Android and have an application as follows:

    1) I record videos by my phone (Samsung Galaxy Note 2). 2) I send video files (mp4) to a cloud (Dropbox in my example) without any change in encoding. And store the URL of the sent video on the cloud.

    And when the application is in view video mode, 3) I want to view the videos with the URL (which may be captured by other client Applications) in videoview.

    I cannot view the videos that are captured by the phone itself. There are many discussions in SO about the encoding compatibility (H 263, H 264 etc.).

    Video recoding with ffmpeg

    However, I could not manage to find a way to CHANGE the encoding of the video to be recorded by the application. Camera.Parameters class has the encoding information only for pictures. The quality is not important, I only want to capture videos which can be directly played in the same Android application without any change.

  • Decoding audio via Android using FFMpeg

    31 octobre 2013, par Rob Haupt

    I can play Wav files using the below code without issues. When trying to play the exact same media in Mp3 format I only get garbled junk. I believe I am fundamentally misunderstanding how the avcodec_decode_audio3 function works.

    Since the Wav file contains PCM data when it is decoded it can go straight to the AudioTrack.write function. There must be some additional step to get Mp3s to work like this. I don't know what I'm missing, but I've been pulling my hair out for a week now.

    Java Code

    package com.rohaupt.RRD2;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.SystemClock;

public class player extends Activity
{
    private AudioTrack track;
    private FileOutputStream os;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        createEngine();

        MediaPlayer mp = new MediaPlayer();
        mp.start();

        int bufSize = AudioTrack.getMinBufferSize(32000,
                                                  AudioFormat.CHANNEL_CONFIGURATION_STEREO, 
                                                  AudioFormat.ENCODING_PCM_16BIT);


        track = new AudioTrack(AudioManager.STREAM_MUSIC, 
                               32000, 
                               AudioFormat.CHANNEL_CONFIGURATION_STEREO, 
                               AudioFormat.ENCODING_PCM_16BIT, 
                               bufSize,
                               AudioTrack.MODE_STREAM);

        byte[] bytes = new byte[bufSize];

        try {
            os = new FileOutputStream("/sdcard/a.out",false);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String result = loadFile("/sdcard/a.mp3",bytes);

        try {
            os.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    void playSound(byte[] buf, int size) {  
        //android.util.Log.v("ROHAUPT", "RAH Playing");
        if(track.getPlayState()!=AudioTrack.PLAYSTATE_PLAYING)
            track.play();
        track.write(buf, 0, size);

        try {
            os.write(buf,0,size);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


    private native void createEngine();
    private native String loadFile(String file, byte[] array);

    /** Load jni .so on initialization*/ 
    static {
         System.loadLibrary("avutil"); 
         System.loadLibrary("avcore"); 
         System.loadLibrary("avcodec");
         System.loadLibrary("avformat");
         System.loadLibrary("avdevice");
         System.loadLibrary("swscale");
         System.loadLibrary("avfilter");
         System.loadLibrary("ffmpeg");
    }
}

    C Code

    #include 
#include 
#include 
#include log.h>

#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"

#define DEBUG_TAG "ROHAUPT"  

void Java_com_rohaupt_RRD2_player_createEngine(JNIEnv* env, jclass clazz)
    {
        avcodec_init();

        av_register_all();


    }

    jstring Java_com_rohaupt_RRD2_player_loadFile(JNIEnv* env, jobject obj,jstring file,jbyteArray array)
    {   
        jboolean            isCopy;  
        int                 i;
        int                 audioStream=-1;
        int                 res;
        int                 decoded = 0;
        int                 out_size;
        AVFormatContext     *pFormatCtx;
        AVCodecContext      *aCodecCtx;
        AVCodecContext      *c= NULL;
        AVCodec             *aCodec;
        AVPacket            packet;
        jclass              cls = (*env)->GetObjectClass(env, obj);
        jmethodID           play = (*env)->GetMethodID(env, cls, "playSound", "([BI)V");//At the begining of your main function
        const char *        szfile = (*env)->GetStringUTFChars(env, file, &isCopy);
        int16_t *           pAudioBuffer = (int16_t *) av_malloc (AVCODEC_MAX_AUDIO_FRAME_SIZE*2+FF_INPUT_BUFFER_PADDING_SIZE);
        int16_t *           outBuffer = (int16_t *) av_malloc (AVCODEC_MAX_AUDIO_FRAME_SIZE*2+FF_INPUT_BUFFER_PADDING_SIZE);


        __android_log_print(ANDROID_LOG_INFO, DEBUG_TAG, "RAH28 Starting");
        res = av_open_input_file(&pFormatCtx, szfile, NULL, 0, NULL);
        if(res!=0)
        {
            __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH opening input failed with result: [%d]", res);
            return file;
        }

        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH getting stream info");
        res = av_find_stream_info(pFormatCtx);
        if(res<0)
        {
            __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH getting stream info failed with result: [%d]", res);
            return file;
        }

        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH getting audio stream");
        for(i=0; i < pFormatCtx->nb_streams; i++) {
          if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO &&
             audioStream < 0) {
            audioStream=i;
          }
        }


        if(audioStream==-1)
        {
            __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH couldn't find audio stream");
            return file;
        }
        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio stream found with result: [%d]", res);


        aCodecCtx=pFormatCtx->streams[audioStream]->codec;
        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio codec info loaded");

        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio codec info [%d]", aCodecCtx->codec_id);

        aCodec = avcodec_find_decoder(aCodecCtx->codec_id);
        if(!aCodec) {
           __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio codec unsupported");
           return file;
        }
        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio codec info found");


        res = avcodec_open(aCodecCtx, aCodec);
        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio codec loaded [%d] [%d]",aCodecCtx->sample_fmt,res);

        //c=avcodec_alloc_context();
        av_init_packet(&packet);


        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH channels [%d] sample rate [%d] sample format [%d]",aCodecCtx->channels,aCodecCtx->sample_rate,aCodecCtx->sample_fmt);


        int x,y;
        x=0;y=0;
        while (av_read_frame(pFormatCtx, &packet)>= 0) {
            __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH frame read: [%d] [%d]",x++,y);

            if (aCodecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
                        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH audio ready");
                        int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE*2+FF_INPUT_BUFFER_PADDING_SIZE;
                        int size=packet.size;
                        y=0;
                        decoded = 0;
                        __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH packet size: [%d]", size);
                        while(size > 0) {

                                __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH decoding: [%d] [%d]",x,y++);
                                int len = avcodec_decode_audio3(aCodecCtx, pAudioBuffer, &data_size, &packet);



                                __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH 1 size [%d] len [%d] data_size [%d] out_size [%d]",size,len,data_size,out_size);
                                jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);

                                memcpy(bytes + decoded, pAudioBuffer, len); //


                                __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH 2");

                                (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
                                __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH 3");

                                (*env)->CallVoidMethod(env, obj, play, array, len);

                                __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH 4");


                                size -= len;
                                decoded += len;

                       }
                       av_free_packet(&packet);
            }

     }

          // Close the video file
        av_close_input_file(pFormatCtx);

        //__android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "RAH Finished Running result: [%d]", res);
        (*env)->ReleaseStringUTFChars(env, file, szfile);   
        return file;  
    }

    To add some detail. When Calling this function with a Wav File I get the following Log Data

    I/ROHAUPT (  227): RAH28 Starting
D/ROHAUPT (  227): RAH getting stream info
D/ROHAUPT (  227): RAH getting audio stream
D/ROHAUPT (  227): RAH audio stream found with result: [0]
D/ROHAUPT (  227): RAH audio codec info loaded
D/ROHAUPT (  227): RAH audio codec info [65536]
D/ROHAUPT (  227): RAH audio codec info found
D/ROHAUPT (  227): RAH audio codec loaded [1] [0]
D/ROHAUPT (  227): RAH channels [2] sample rate [32000] sample format [1]
D/ROHAUPT (  227): RAH frame read: [0] [0]
D/ROHAUPT (  227): RAH audio ready
D/ROHAUPT (  227): RAH packet size: [4096]
D/ROHAUPT (  227): RAH decoding: [1] [0]
D/ROHAUPT (  227): RAH 1 size [4096] len [4096] data_size [4096] out_size [0]
D/ROHAUPT (  227): RAH 2
D/ROHAUPT (  227): RAH 3
D/ROHAUPT (  227): RAH 4
D/ROHAUPT (  227): RAH frame read: [1] [1]
D/ROHAUPT (  227): RAH audio ready
...
D/ROHAUPT (  227): RAH frame read: [924] [1]
D/ROHAUPT (  227): RAH audio ready
D/ROHAUPT (  227): RAH packet size: [4096]
D/ROHAUPT (  227): RAH decoding: [925] [0]
D/ROHAUPT (  227): RAH 1 size [4096] len [4096] data_size [4096] out_size [0]
D/ROHAUPT (  227): RAH 2
D/ROHAUPT (  227): RAH 3
D/ROHAUPT (  227): RAH 4
D/ROHAUPT (  227): RAH frame read: [925] [1]
D/ROHAUPT (  227): RAH audio ready
D/ROHAUPT (  227): RAH packet size: [3584]
D/ROHAUPT (  227): RAH decoding: [926] [0]
D/ROHAUPT (  227): RAH 1 size [3584] len [3584] data_size [3584] out_size [0]
D/ROHAUPT (  227): RAH 2
D/ROHAUPT (  227): RAH 3
D/ROHAUPT (  227): RAH 4

    When calling with an Mp3 file I get the following

    I/ROHAUPT (  280): RAH28 Starting
D/ROHAUPT (  280): RAH getting stream info
D/ROHAUPT (  280): RAH getting audio stream
D/ROHAUPT (  280): RAH audio stream found with result: [0]
D/ROHAUPT (  280): RAH audio codec info loaded
D/ROHAUPT (  280): RAH audio codec info [86017]
D/ROHAUPT (  280): RAH audio codec info found
D/ROHAUPT (  280): RAH audio codec loaded [1] [0]
D/ROHAUPT (  280): RAH channels [2] sample rate [32000] sample format [1]
D/ROHAUPT (  280): RAH frame read: [0] [0]
D/ROHAUPT (  280): RAH audio ready
D/ROHAUPT (  280): RAH packet size: [432]
D/ROHAUPT (  280): RAH decoding: [1] [0]
D/ROHAUPT (  280): RAH 1 size [432] len [432] data_size [4608] out_size [0]
D/ROHAUPT (  280): RAH 2
...
D/ROHAUPT (  280): RAH frame read: [822] [1]
D/ROHAUPT (  280): RAH audio ready
D/ROHAUPT (  280): RAH packet size: [432]
D/ROHAUPT (  280): RAH decoding: [823] [0]
D/ROHAUPT (  280): RAH 1 size [432] len [432] data_size [4608] out_size [0]
D/ROHAUPT (  280): RAH 2
D/ROHAUPT (  280): RAH 3
D/ROHAUPT (  280): RAH 4
D/ROHAUPT (  280): RAH frame read: [823] [1]
D/ROHAUPT (  280): RAH audio ready
D/ROHAUPT (  280): RAH packet size: [432]
D/ROHAUPT (  280): RAH decoding: [824] [0]
D/ROHAUPT (  280): RAH 1 size [432] len [432] data_size [4608] out_size [0]
D/ROHAUPT (  280): RAH 2
D/ROHAUPT (  280): RAH 3
D/ROHAUPT (  280): RAH 4

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