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• Need a workaround for error in xuggler todo with vorbis

  25 septembre 2012, par Chris

  I have been at this for days, I am using xuggler, the only version i can use is 3.4 because upto 4.4 writing to outputstream directly causes jvm crash.

  I need to encode audio using vorbis, however, when i run code which works with any other audio codec I get

  2012-09-25 13:54:16,578 [Thread-4] ERROR org.ffmpeg - [libvorbis @ 0308a010] libvorbis : buffer overflow.
  2012-09-25 13:54:16,578 [Thread-4] WARN com.xuggle.xuggler - error : avcodec_encode_audio failed (../../../../../../../csrc/com/xuggle/xuggler/StreamCoder.cpp:1586)

  I think a workaround for found for this is in later versions of StreamCoder.cpp

  if (mCodecContext->codec->id == CODEC_ID_FLAC
  
            || mCodecContext->codec->id == CODEC_ID_VORBIS)
  
    {
  
      // FLAC & VORBIS audio for some reason gives an error if your output buffer isn't
  
      // over double the frame size, so we fake it here.  This could be further optimized
  
      // to only require an exact number, but this math is simpler and will always
  
      // be large enough.
  
      bufferSize = (64 + getAudioFrameSize() * (bytesPerSample + 1)) * 2;
  
    }

  But if I use the following code to make the IBuffer,

      int bufferSize = aCoder.getAudioFrameSize() * (aCoder.getBitRate());
  
      final byte[] audioBuf = new byte[bufferSize];
  
      //read audio bytes into audiobuf....
  
  
  
      buf = IBuffer.make(null, audioBuf, 0, (64 + aCoder.getAudioFrameSize() *    (aCoder.getBitRate() + 1)) * 2);
  
      System.out.println("afterbufmake");
  
      smp = IAudioSamples.make(buf,1,IAudioSamples.Format.FMT_S16);
  
              if (smp == null) {
  
                    System.out.println("smp == null");
  
                 // return;
  
              }

  smp always ends up null.

  Can anyone think of what might be happening with buffer overflow for just Vorbis and a workaround as I have only 3.4 version of Xuggler that works for what I need which is writing to outputstream.

  Thank you.

• unable to create flv file from 3gp using ffmpeg php

  25 septembre 2012, par Naeem

  i am using the following code but it is not generating the flv file, other code is working fine if i convert mp4 to flv, following is my code.

   define('FFMPEG','/usr/local/bin/ffmpeg');
  
   $src='/home/zimmapp/public_html/images/video/video_3465733831.3gp';
  
   $destination='/home/zimmapp/public_html/images/video/naeem.flv';
  
  
  
  //i  user this code
  
  exec(FFMPEG . " -i $src  -sameq -ar 22050 -ab 96000 -deinterlace -nr 500 -s 320x240 -aspect 4:3 -r 20 -g 500 -me_range 20 -b 270k -deinterlace -f flv -y $destination");
  
  //OR this 
  
  exec( FFMPEG ." -i $src -ar 22050 -ab 32 -f flv -s 320×240 $destination") or print "Convert Error";

  BUT Nothing working
  my website support gave me this error report :

  server I found this error:Seems stream 0 codec frame rate differs from container frame rate : 180000.00
  (180000/1) -> 90000.00 (180000/2) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
  '/home/zimmapp/public_html/images/video/1347616191-2.3gp' : Metadata :
  major_brand : isom minor_version : 0 compatible_brands : isom3gp4 creation_time
   : 2012-09-06 07:02:00 Duration : 00:00:02.32, start : 0.000000, bitrate : 9769 kb/s Stream #0.0(eng) : Video : h264, yuv420p, 1280x720, 11834 kb/s, 29.58 fps, 90k tbr, 90k tbn, 180k tbc Metadata : creation_time : 2012-09-06 07:02:00 Stream #0.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 126 kb/s Metadata :
  creation_time : 2012-09-06 07:02:00 Unable to find a suitable output format for ' -sameq'

• Need help correcting Access Violation with FFmpeg DLL

  26 septembre 2012, par James

  I'm trying to use the FFmpeg dll's using Visual Studio 2012 and I'm getting a run time access violation when I call avcodec_find_encoder. Here is the code :

  // TestFFmpeg.cpp : Defines the entry point for the console application.
  
  //
  
  
  
  #include "stdafx.h"
  
  
  
  extern "C" {
  
  #include "libavcodec\avcodec.h"
  
  #include "libavformat\avformat.h"
  
  }
  
  
  
  #define INBUF_SIZE 4096
  
  
  
  int _tmain(int argc, _TCHAR* argv[])
  
  {
  
      AVCodec *codec;
  
  
  
      const char *videoFilename = "C:\\Users\\Public\\Videos\\Sample Videos\\Wildlife.wmv";
  
  
  
      av_register_all(); // This works; however, no parameters or return values.
  
  
  
      codec = avcodec_find_encoder(CODEC_ID_WMV3);  // Run time Access Violation HERE
  
      if (!codec) {
  
      fprintf(stderr, "Codec not found\n");
  
          exit(1);
  
      }
  
  
  
      return 0;
  
  }

  Here is the error message :

  Unhandled exception at 0x75C18B60 (msvcrt.dll) in TestFFmpeg.exe : 0xC0000005 : Access violation reading location 0x00000049.

  The stack trace is :

      msvcrt.dll!_strcmp()    Unknown
  
      avcodec-54.dll!6a56caac()   Unknown
  
      [Frames below may be incorrect and/or missing, no symbols loaded for avcodec-54.dll]    
  
  >   TestFFmpeg.exe!wmain(int argc, wchar_t * * argv) Line 23    C++
  
      TestFFmpeg.exe!__tmainCRTStartup() Line 533 C
  
      TestFFmpeg.exe!wmainCRTStartup() Line 377   C
  
      kernel32.dll!@BaseThreadInitThunk@12()  Unknown
  
      ntdll.dll!___RtlUserThreadStart@8() Unknown
  
      ntdll.dll!__RtlUserThreadStart@8()  Unknown

  I'm guessing there's a problem with returning the codec pointer, but I'm new to C++ and have no idea how to correct it. I tried the cdecl, stdcall, and fastcall calling conventions — none corrected the issue. I'm using the latest 32-bit DLL from Zeranoe. Any suggestions ?

  EDIT :
  I've called other functions in the DLL and they work. For example, avformat_open_input works properly. I can pass parameters and the function returns a successful return value (0) and populates the format context structure. av_find_stream_info works as well. I still can't figure out why avcodec_find_decoder creates an access violation.