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• Recording MP3 file from iphone using FFMPEG

  16 octobre 2014, par harit shah

  I am trying to record an mp3 file from iphone. It seems it is not possible so next option I am trying is recording it with aac encoding and convert it with ffmpeg exe to mp3.

  I am recording the m4a file with following code :

  // Set the audio file
  
  NSArray *pathComponents = [NSArray arrayWithObjects:
  
                             [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
  
                             @"MyAudioMemo.aac",
  
                             nil];
  
  NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];
  
  
  
  // Setup audio session
  
  AVAudioSession *session = [AVAudioSession sharedInstance];
  
  [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
  
  UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
  
  AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);
  
  
  
  NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:10];
  
  NSNumber *formatObject;
  
  formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC];
  
  
  
  [recordSettings setObject:formatObject forKey: AVFormatIDKey];
  
  [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];
  
  [recordSettings setObject:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
  
  // [recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey];
  
  // [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
  
  [recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey];

  so when I try to convert it using ffmpeg -i 1.m4a 1.mp3 it says invalid input found while reading 1.m4a. I tried different encoding but everytime I get the same error. Any help on this would be life saving.

  Thanks.

• Is there anyway to tell if an openCV cap.read() call will fail before it begins to parse a video ?

  18 novembre 2022, par aris-t

  Problem : I am per frame parsing very long videos with a complex algorithm for AI applications in python. This is a slow and long process even using multiprocessing and threading tricks. Therefore it is very annoying when it dies half way through its process due to an open CV issue with the video.

  


  Request : Does anyone know a good way in python for open cv to raise an error before it begins to parse a video if the video would later throw a fatal error or None from cap.read() ? An added bonus would for the solution to at least give me a frame number and a reason so that I may edit or reconvert the video to fix this.

  


  Latest Issue :

  


  [h264 @ 0x41cad80] Invalid NAL unit size (-66445153 > 10189).
[h264 @ 0x41cad80] Error splitting the input into NAL units.


  


  Thanks in advance.

  


• FFMPEG 1.0 ANDROID NDK R8B

  6 février 2013, par user1613977

  I have tried to compile the last version of ffmpeg with the android ndk r8b, but i always have errors and i dont know how to solve them. I am reading this tutorial http://www.roman10.net/how-to-build-ffmpeg-for-android/ but the script doesnt work with my environment, i am using this :
   Ubuntu 12.04 LTS.
   Intel Core i7.
   Android ndk r8b
   Last version ffmeg (1.0)

  Basically i want to encode films from one format to other.

  And that is the script that i am using :

  NDK=../android-ndk-r8b
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  function build_r8b
  
  {
  
  bash configure \
  
  --disable-shared \
  
  --enable-static \
  
  --enable-gpl \
  
  --enable-version3 \
  
  --enable-nonfree \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-avfilter \
  
  --disable-postproc \
  
  --enable-small \
  
  --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
  --enable-cross-compile \
  
  --target-os=linux \
  
  --extra-cflags="-I$PLATFORM/usr/include" \
  
  --extra-ldflags="-L$PLATFORM/usr/lib -nostdlib" \
  
  --arch=arm \
  
  --disable-symver \
  
  --disable-debug \
  
  --disable-stripping \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  sed -i 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.h
  
  sed -i 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.h
  
  sed -i 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.h
  
  sed -i 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.h
  
  sed -i 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.h
  
  sed -i 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.h
  
  make clean
  
  make  -j4 install
  
  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib   -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
  
  }
  
  #arm v7vfpv3
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one
  
  build_r8b

  And that is the terminal result

  jllarraz@ubuntu:~/Descargas/ffmpeg$ bash build_android.sh
  
  /android-ndk-r8b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  make: execvp: ./version.sh: Permiso denegado
  
  make: execvp: ./version.sh: Permiso denegado
  
  HOSTCC  doc/print_options.o
  
  CC  cmdutils.o
  
  CC  libavdevice/alldevices.o
  
  CC  libavdevice/avdevice.o
  
  In file included from doc/print_options.c:104:0:
  
  ./libavcodec/options_table.h: En la función ‘show_codec_opts’:
  
  ./libavcodec/options_table.h:85:1: aviso: ‘sub_id’ es obsoleto (declarado en  ./libavcodec/avcodec.h:1505) [-Wdeprecated-declarations]
  
  ./libavcodec/options_table.h:149:1: aviso: ‘luma_elim_threshold’ es obsoleto (declarado en ./libavcodec/avcodec.h:1740) [-Wdeprecated-declarations]
  
  ./libavcodec/options_table.h:150:1: aviso: ‘chroma_elim_threshold’ es obsoleto (declarado en ./libavcodec/avcodec.h:1747) [-Wdeprecated-declarations]
  
  ./libavcodec/options_table.h:284:1: aviso: ‘color_table_id’ es obsoleto (declarado en ./libavcodec/avcodec.h:1986) [-Wdeprecated-declarations]
  
  ./libavcodec/options_table.h:307:1: aviso: ‘inter_threshold’ es obsoleto (declarado en ./libavcodec/avcodec.h:2049) [-Wdeprecated-declarations]
  
  ./libavcodec/options_table.h:312:1: aviso: ‘quantizer_noise_shaping’ es obsoleto (declarado en ./libavcodec/avcodec.h:2056) [-Wdeprecated-declarations]
  
  cmdutils.c:52:21: error fatal: version.h: No existe el archivo o el directorio
  
  compilación terminada.
  
  make: *** [cmdutils.o] Error 1
  
  make: *** Se espera a que terminen otras tareas....
  
  build_android.sh: línea 59: ../android-ndk-r8b/toolchains/arm-linux-androideabi- 4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-ar: Permiso denegado
  
  build_android.sh: línea 60: ../android-ndk-r8b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-ld: Permiso denegado