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• Building A livestreaming server like youtube from scratch

  9 décembre 2022, par Dipo Ahmed

  I am trying to build a live streaming server like youtube where I can watch the video live or if I want to I can play the video from any duration I want.

  


  What I have tried so far.
I have built a node js WebSocket server where I push the video blob that I receive from the browser via MediaRecorder API every 2 seconds. This blob is then getting converted to hls by a ffmpeg process which generates 2 seconds *.ts files and a .m3u8 file which I am playing with video.js in browser.

  


  This is my ffmpeg command

  


   spawn('ffmpeg', [
        '-i', '-',
        // '-re',
        '-fflags', '+igndts',

        '-vcodec', 'h264',
        '-acodec', 'aac',

        '-preset', 'slow',
        '-crf', '22',
        // You can also use QP value to adjust output stream quality, e.g.: 
        // '-qp', '0',
        // You can also specify output target bitrate directly, e.g.:
        '-b:v', '1500K',
        '-b:a', '128K', // Audio bitrate

        '-f', 'hls',
        '-hls_time', '1',
        // '-hls_playlist_type', 'vod',
        '-hls_list_size', '2',
        '-hls_flags', 'independent_segments',
        '-hls_segment_type', 'mpegts',
        '-hls_segment_filename', `${path}/stream%02d.ts`, `${path}/stream.m3u8`,
    ]);


  


  The problem is that the video js player duration is not updating like in youtube where the video duration increases every second.

  


  Any direction will be appreciated. Please tell me if my approach is wrong and what needs to be learned for me to build this system.

  


• doc : Fix building community.html from the new community.texi

  1er mars 2023, par Martin Storsjö

  doc : Fix building community.html from the new community.texi
  In texi source, @ characters need to be escaped.
  This fixes the following build errors :
  community.texi:59 : unknown command `ffmpeg'
  
  community.texi:143 : unknown command `ffmpeg'
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] doc/community.texi

• error building ffmpeg on mac high sierra 10.13 "workspace/bin/ffmpeg' : No such file or directory"

  14 mars 2023, par Martin

  Hello I am trying to create a shell script buildffmpeg.sh which when ran, will download and build ffmpeg, so you can automate the process of making a custom ffmpeg build where the end result is an ffmpeg and ffprobe executable.

  


  If you run the below script on mac or linux, it's worked perfectly, but when I test on my older macos 10.13 version, I first got an error about my ffmpeg snapshot url being too old :
FFMPEG_URL="https://git.ffmpeg.org/gitweb/ffmpeg.git/snapshot/74c4c539538e36d8df02de2484b045010d292f2c.tar.gz"
so I updated the var so it 'should' link to ffmpeg 6.0 (the most recent version, but im not sure if my link is correct)
FFMPEG_URL="https://git.ffmpeg.org/gitweb/ffmpeg.git/snapshot/adb4688bfb0652b2ffa5bc29e53761e27e1a3b3e.tar.gz"

  


  When I run my below script on my mac terminal with the command $ ./buildffmpeg.sh it prints out '11' and then fails with an error :

  


  ...
INSTALL libavutil/ffversion.h
INSTALL libavutil/libavutil.pc
~11~
/Library/Developer/CommandLineTools/usr/bin/objdump: '/Users/apple/Documents/projects/buildffmpeghighsierra/workspace/bin/ffmpeg': No such file or directory


  


  With the error being workspace/bin/ffmpeg': No such file or directory

  


  Is there something wrong with how my script builds ffmpeg ?

  


  #!/bin/bash

set -e

CWD=$(pwd)
PACKAGES="$CWD/packages"
WORKSPACE="$CWD/workspace"
ADDITIONAL_CONFIGURE_OPTIONS=""


mkdir -p "$PACKAGES"
mkdir -p "$WORKSPACE"
echo '~0~'
FFMPEG_TAG="$1"
FFMPEG_URL="https://git.ffmpeg.org/gitweb/ffmpeg.git/snapshot/adb4688bfb0652b2ffa5bc29e53761e27e1a3b3e.tar.gz"
echo '~1~'
FFMPEG_ARCHIVE="$PACKAGES/ffmpeg.tar.gz"
echo '~2~'
if [ ! -f "$FFMPEG_ARCHIVE" ]; then
    echo "Downloading tag ${FFMPEG_TAG}..."
    echo "~2.1~ FFMPEG_ARCHIVE=$FFMPEG_ARCHIVE"
    echo "~2.2~ FFMPEG_URL=$FFMPEG_URL"
    curl -L -k -o "$FFMPEG_ARCHIVE" "$FFMPEG_URL"
fi
echo '~3~'
EXTRACTED_DIR="$PACKAGES/extracted"
echo '~4~'
mkdir -p "$EXTRACTED_DIR"
echo '~5~'
echo "Extracting..."
tar -xf "$FFMPEG_ARCHIVE" --strip-components=1 -C "$EXTRACTED_DIR"
echo '~6~'
cd "$EXTRACTED_DIR"
echo '~7~'
echo "Building..."
echo '~8~'
# Min electron supported version
MACOS_MIN="10.10"
echo '~9~'
./configure $ADDITIONAL_CONFIGURE_OPTIONS \
    --pkgconfigdir="$WORKSPACE/lib/pkgconfig" \
    --pkg-config-flags="--static" \
    --extra-cflags="-I$WORKSPACE/include -mmacosx-version-min=${MACOS_MIN}" \
    --extra-ldflags="-L$WORKSPACE/lib -mmacosx-version-min=${MACOS_MIN}" \
    --extra-libs="-lpthread -lm" \
        --enable-static \
        --disable-securetransport \
        --disable-debug \
        --disable-shared \
        --disable-ffplay \
        --disable-lzma \
        --disable-doc \
        --enable-version3 \
        --enable-pthreads \
        --enable-runtime-cpudetect \
        --enable-avfilter \
        --enable-filters \
        --disable-libxcb \
        --enable-gpl \
        --disable-libass \
        --enable-libmp3lame \
        --enable-libx264 
echo '~10~'
make -j 4
echo '~11~'
make install
echo '~11~'
otool -L "$WORKSPACE/bin/ffmpeg"
echo '~12~'
otool -L "$WORKSPACE/bin/ffprobe"
echo '~13~'
echo "Building done. The binaries can be found here: $WORKSPACE/bin/ffmpeg $WORKSPACE/bin/ffprobe"
echo '~14~'
mkdir ffmpeg-mac/ 
echo '~15~'
cp -r "$WORKSPACE/bin/" "$CWD/ffmpeg-mac/"
echo '~16~'
rm -rf "$PACKAGES"
echo '~17~'
rm -rf "$WORKSPACE"
echo '~18~'
exit 0