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• How to decode audio sound from Mp4 video

  30 avril 2016, par Sagar
  • I want to decode audio and video from mp4 video and also want to endode them in mp4 file.
  • I am able to decode frames and created video, but i don’t understood how to decode audio and encode it again to same mp4 file.
  • i am using ffmpeg lib in c++.

• Add mp3 file sound in the middle of the mp4/avi/mpeg [on hold]

  17 novembre 2014, par user1018697

  I tryed to do something, and i meet some diffulties to do :

  1- i have a little movie file of 1 minutes ( movie.mp4)

  2- i have an mp3 file of 10 seconds (voice.mp3)

  I whish to add this mp3 file in the middle of my film (at 30 seconds).
  My question is :
  Is it possible create simply a new video (movie2.mp4) with my mp3 added in the middle of the film (at 30 s) ?
  Or maybe is exist a c# library or c++ to do this ?

  Thanks

• There is no sound with iFrameExtractor player

  22 octobre 2012, par why

  I has built ffmpeg and iFrameExtractor with ios5.1 successful, But when I play the video, There is no sound

  // Register all formats and codecs
  
  avcodec_register_all();
  
  av_register_all();
  
  avformat_network_init();
  
  
  
  
  
  if(avformat_open_input(&pFormatCtx, [@"http://somesite.com/test.mp4" cStringUsingEncoding:NSASCIIStringEncoding], NULL, NULL) != 0) {
  
      av_log(NULL, AV_LOG_ERROR, "Couldn't open file\n");
  
      goto initError;
  
  }

  The log is

  [swscaler @ 0xdd3000] No accelerated colorspace conversion found from
  
   yuv420p to rgb24. 2012-10-22 20:42:47.344 iFrameExtractor[356:707]
  
   video duration: 5102.840000 2012-10-22 20:42:47.412
  
   iFrameExtractor[356:707] video size: 720 x 576 2012-10-22 20:42:47.454
  
   iFrameExtractor[356:707] Application windows are expected to have a
  
   root view

  This is my configure file for ffmpeg 0.11.1 :

  #!/bin/tcsh -f
  
  
  
  rm -rf compiled/*
  
  
  
  ./configure \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
  
  --as='/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk \
  
  --target-os=darwin \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --extra-cflags='-arch armv7' \
  
  --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' \
  
  --prefix=compiled/armv7 \
  
  --enable-cross-compile \
  
  --enable-nonfree \
  
  --disable-armv5te \
  
  --disable-swscale-alpha \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --enable-decoder=h264 \
  
  --enable-decoder=svq3 \
  
  --disable-asm \
  
  --disable-bzlib \
  
  --disable-gpl \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-mmx \
  
  --disable-neon \
  
  --disable-decoders \
  
  --disable-muxers \
  
  --disable-demuxers \
  
  --disable-devices \
  
  --disable-parsers \
  
  --disable-encoders \
  
  --enable-protocols \
  
  --disable-filters \
  
  --disable-bsfs \
  
  --disable-postproc \
  
  --disable-debug