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• Compression in Android taking long time

  24 avril 2017, par NSR

  I am new to Video related operations. I am using [FFMPEG][1] to compress a video in my Android application.

  I am trying to compress a video of 50MB to 10MB by executing following command

  ffmpeg -y -i /videos/in.mp4 -strict experimental -s 640x480 -r 25 -vcodec mpeg4 -b 150k -ab 48000 -ac 2 -ar 22050 /videos/out.mp4

  Video compressing successfully, but it taking more than 150 seconds. I am unable find out how to reduce that time.

  I want to change this command to complete this process in less time.

• Using Python script to cut long videos into chunks in FFMPEG

  23 février 2016, par Michael Hamilton

  Starting off by saying I’m not a programmer, but I really need the application this Python script I found says it can do.

  Auto-Splitting Script by Antarctic Nest of Icephoenix

  Basically I have a directory of long .MP4s that need to be cut into equal parts based on a total running time of 3 hours 15 minutes. For example, I would have an 8 hour video that needs to be cut into smaller parts each under 3:15:00.

  We’ve been manually crating FFMPEG codes to do this, but I found the Python script above that seems like it will do what we are needing. The issue is that I have no Python experience. I don’t know where in the script to enter in the folder path with the videos, or where to specify my codecs, or where to tell the program that the max time for each video chunk is 3:15:00.

  I’m on a 64-bit windows system working in command prompt

  Here’s what I have done :

  • Installed python 3
  • downloaded the script
  • I can click on the script to see the cmd window flash to indicate it’s running
  • I enter "C :\Python34\python.exe V :\ffmpeg\ffmpeg-split.py" into cmd

  • output is

    File "V :\ffmpeg\ffmpeg-split.py", line 16
    print "Split length can’t be 0"

      SyntaxError: Missing parentheses in call to 'print'

  I have no idea where to go from here. It seems like the script is loading properly, but I haven’t entered my variables. Any help with where to put the information would be appreciated.

  Here is the FFMPEG code we usually use :

  ffmpeg -i V :\ffmpeg\88518_63c392af.mp4 -vcodec libx264 -acodec copy -vf fps=fps=30000/1001 -ss 00:05:01.000 -t 02:43:49.000 V :\events\88518.mp4

  The ffmpeg codes we use :

  -i is a .mp4

  -vcodec h.264 codec

  -acodec should be “copy” or can be “libvo_aacenc”

  -vf fps=30000/1000 a forced fps of 29.97

  -ss is start time (we would use this to manually cut into parts along with -t)

  -t is duration (we would calculate the duration for each part as the total run time divided by the equal time under 3:15:00 be it two, three, or four parts)

  Thank you a million dollars

• How to improve the performance of Audio Queue Services when playing audio ?

  11 décembre 2014, par 谢小进

  I want to play RTMP’s H.264/AAC using FFmpeg for decoding and playing video, Audio Queue Services for playing audio. I have successfully done them all, but still some tough issues, for example high memory allocation when playing audio. I have debugged and found that Audio Queue Services lead to high memory allocation, and then crash ! Does anybody know how to improve the memory performance ? Here is my code for Audio Queue Services playing audio.

  //
  
  //  RTMPAudioPlayer.h
  
  //
  
  
  
  #import <foundation></foundation>Foundation.h>
  
  #import <audiotoolbox></audiotoolbox>AudioToolbox.h>
  
  
  
  @interface AQBuffer : NSObject
  
  
  
  @property (nonatomic) AudioQueueBufferRef buffer;
  
  
  
  @end
  
  
  
  
  
  @interface RTMPAudioPlayer : NSObject {
  
      AudioQueueRef queue;
  
      AudioStreamBasicDescription dataFormat;
  
      NSMutableArray *buffers;
  
      NSMutableArray *reusableBuffers;
  
  }
  
  
  
  - (id)initWithSampleRate:(int)sampleRate channels:(int)channels bitsPerChannel:(int)bitsPerChannel;
  
  - (void)start;
  
  - (void)stop;
  
  - (void)putData:(NSData *)data;
  
  
  
  @end
  
  
  
  
  
  
  
  
  
  //
  
  //  RTMPAudioPlayer.m
  
  //
  
  
  
  #import "RTMPAudioPlayer.h"
  
  
  
  static const int kNumberBuffers = 3;
  
  static const int kBufferSize    = 0xA000;
  
  
  
  @implementation AQBuffer
  
  
  
  @end
  
  
  
  
  
  @implementation RTMPAudioPlayer
  
  
  
  void AQOutputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inCompleteAQBuffer) {
  
      RTMPAudioPlayer *THIS = (__bridge RTMPAudioPlayer *)inUserData;
  
      [THIS handleAQOutputCallback:inAQ buffer:inCompleteAQBuffer];
  
  }
  
  
  
  - (void)handleAQOutputCallback:(AudioQueueRef)audioQueue buffer:(AudioQueueBufferRef)buffer {
  
      for (int i = 0; i &lt; [buffers count]; ++i) {
  
          if (buffer == [buffers[i] buffer]) {
  
              [reusableBuffers addObject:buffers[i]];
  
              break;
  
          }
  
      }
  
  }
  
  
  
  - (id)initWithSampleRate:(int)sampleRate channels:(int)channels bitsPerChannel:(int)bitsPerChannel {
  
      self = [super init];
  
      if (self) {
  
          memset(&amp;dataFormat, 0, sizeof(dataFormat));
  
          dataFormat.mSampleRate = sampleRate;
  
          dataFormat.mFormatID = kAudioFormatLinearPCM;
  
          dataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
  
          dataFormat.mBitsPerChannel = bitsPerChannel;
  
          dataFormat.mChannelsPerFrame = channels;
  
          dataFormat.mFramesPerPacket = 1;
  
          dataFormat.mBytesPerFrame = (dataFormat.mBitsPerChannel / 8) * dataFormat.mChannelsPerFrame;
  
          dataFormat.mBytesPerPacket = dataFormat.mBytesPerFrame * dataFormat.mFramesPerPacket;
  
      }
  
      return self;
  
  }
  
  
  
  - (void)start {
  
      OSStatus status = AudioQueueNewOutput(&amp;dataFormat, AQOutputCallback, (__bridge void *)self, NULL, NULL, 0, &amp;queue);
  
      if (status == noErr) {
  
          buffers = [NSMutableArray array];
  
          reusableBuffers = [NSMutableArray array];
  
          for (int i = 0; i &lt; kNumberBuffers; i++) {
  
              AudioQueueBufferRef buffer;
  
              status = AudioQueueAllocateBuffer(queue, kBufferSize, &amp;buffer);
  
              if (status == noErr) {
  
                  AQBuffer *bufferObj = [[AQBuffer alloc] init];
  
                  bufferObj.buffer = buffer;
  
                  [buffers addObject:bufferObj];
  
                  [reusableBuffers addObject:bufferObj];
  
              } else {
  
                  AudioQueueDispose(queue, true);
  
                  queue = NULL;
  
                  break;
  
              }
  
          }
  
  
  
          AudioQueueStart(queue, NULL);
  
      } else {
  
          queue = NULL;
  
      }
  
  }
  
  
  
  - (void)stop {
  
      if (queue) {
  
          AudioQueueStop(queue, true);
  
      }
  
  }
  
  
  
  - (void)putData:(NSData *)data {
  
      AQBuffer *bufferObj = [reusableBuffers firstObject];
  
      [reusableBuffers removeObject:bufferObj];
  
      AudioQueueBufferRef buffer;
  
      OSStatus status = AudioQueueAllocateBuffer(queue, kBufferSize, &amp;buffer);
  
      if (status == noErr) {
  
          bufferObj = [[AQBuffer alloc] init];
  
          bufferObj.buffer = buffer;
  
  
  
          memcpy(bufferObj.buffer->mAudioData, [data bytes], [data length]);
  
          bufferObj.buffer->mAudioDataByteSize = [data length];
  
  
  
          AudioQueueEnqueueBuffer(queue, bufferObj.buffer, 0, NULL);
  
      }
  
  }
  
  
  
  @end