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• Adjust Opus Ogg page size using Go

  15 mars 2024, par matthew

  Using the code from Go's Pion WebRTC library play-from-disk example I'm able to create a WebRTC connection and send audio from a local Ogg file to peers.

  


  The play-from-disk example README.md details how to first convert the page size of the Ogg file to 20,000 using ffmpeg, like so :

  


  ffmpeg -i $INPUT_FILE -c:a libopus -page_duration 20000 -vn output.ogg


  


  I'd like to make this same adjustment to Ogg data natively in Go, without using ffmpeg. How can this be done ?

  


  I've tried using Pion's oggreader and oggwriter, but using these requires deep Opus file format and RTP protocol knowledge that neither I nor ChatGPT seem to have.

  


  For additional context, I'm using a Text-to-Speech (TTS) API to generate my Ogg data as follows :

  


  req, err := http.NewRequest("POST", "https://api.openai.com/v1/audio/speech", bytes.NewBuffer([]byte(fmt.Sprintf(`{
    "model": "tts-1",
    "voice": "alloy",
    "input": %q,
    "response_format": "opus",
}`, text))))

req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/json; charset=UTF-8")

client := &http.Client{}
resp, err := client.Do(req)



  


  As I'm trying to create a real-time audio app, ideally, I'd like to pipe the response to WebRTC performing the conversion on chunks as these are received so that peers can start to listen to the audio before it has been fully received on the server.

  


• Android ffmpeg with opus support

  6 décembre 2014, par ademar111190

  I’m following this tutorial, with some changes, i want add the opus support, I think adding the option --enable-libopus is all i need but no, when I try compile with the shell as follow I’m getting the error :

  configure.sh

  #!/bin/bash
  
  
  
  export ANDROID_NDK=/home/ademar/android-ndk-r9
  
  export TOOLCHAIN=$(pwd)/temp/ffmpeg
  
  export SYSROOT=$TOOLCHAIN/sysroot/
  
  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-9 --toolchain=arm-linux-androideabi-4.8 --install-dir=$TOOLCHAIN
  
  
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  export CC=arm-linux-androideabi-gcc
  
  export LD=arm-linux-androideabi-ld
  
  export AR=arm-linux-androideabi-ar
  
  
  
  CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -finline-limit=300 -ffast-math \
  
    -fstrict-aliasing -Werror=strict-aliasing \
  
    -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -Wno-psabi -Wa,--noexecstack \
  
    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ \
  
    -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
    -DANDROID -DNDEBUG"
  
  
  
  EXTRA_CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
  
  EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
  
  
  FFMPEG_FLAGS="--prefix=/tmp/ffmpeg/build \
  
    --target-os=linux \
  
    --arch=arm \
  
    --enable-cross-compile \
  
    --cross-prefix=arm-linux-androideabi- \
  
    --enable-shared \
  
    --disable-symver \
  
    --disable-doc \
  
    --disable-ffplay \
  
    --disable-ffmpeg \
  
    --disable-ffprobe \
  
    --disable-ffserver \
  
    --disable-avdevice \
  
    --disable-avfilter \
  
    --disable-encoders  \
  
    --disable-muxers \
  
    --disable-filters \
  
    --disable-devices \
  
    --disable-everything \
  
    --enable-protocols  \
  
    --enable-parsers \
  
    --enable-demuxers \
  
    --disable-demuxer=sbg \
  
    --enable-decoders \
  
    --enable-bsfs \
  
    --disable-network \
  
    --enable-swscale  \
  
    --enable-asm \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-nonfree \
  
    --enable-version3"
  
  
  
  cd ffmpeg
  
  ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS"

  the error :

  ERROR: opus not found
  
  
  
  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.

  if want i can post the config.log content, but it is big.

  on folder ffmpeg I have a git clone from source.ffmpeg.org on branch release/1.2

• lavf/cafenc : Allow muxing opus.

  17 octobre 2017, par Carl Eugen Hoyos

  lavf/cafenc : Allow muxing opus.
  QuickTime does not require the (unknown) kuki chunk for decoding.
  

  • [DH] libavformat/cafenc.c
  • [DH] libavformat/version.h