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• const command is not defined using ffmpeg and child_process

  19 avril 2021, par davidf214

  I'm doing a project and I have a problem. Im trying to generate a .mpd file for a VOD web. The problem is that when i upload a video, it gets me into the function but it says "const command is not defined".

  


  exports.encodeDash = (videoFile) => {
    return new Promise((resolve, reject) => {
      const parsedFile = path.parse(videoFile);
      const outputFile = `${parsedFile.name}.mpd`
      const outputFilePath = `/videos/dash/${outputFile}`;
      const outputFilemp4 = `${parsedFile.name}.mp4`;
      const outputFilePathmp4 = `/videos/${outputFilemp4}`

      if (parsedFile.ext == '.mp4'){
        let command=`ffmpeg -i ${videoFile} -c:v libx264 -r 24 -g 24 -b:v 1000k -maxrate 1000k -bufsize 2000k /videos/dash/${parsedFile.name}-1000k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-1000k.mp4 /videos/dash/fragmentado/${parsedFile.name}_1000k-frag.mp4 &&
                     ffmpeg -i ${videoFile} -c:v libx264 -r 24 -g 24 -b:v 500k -maxrate 500k -bufsize 1000k /videos/dash/${parsedFile.name}-500k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-500k.mp4 /videos/dash/fragmentado/${parsedFile.name}_500k-frag.mp4 &&
                     ffmpeg -i  ${videoFile} -c:v libx264 -r 24 -g 24 -b:v 250k -maxrate 250k -bufsize 500k /videos/dash/${parsedFile.name}-250k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-250k.mp4 /videos/dash/fragmentado/${parsedFile.name}_250k-frag.mp4 &&
                    python bento4/utils/mp4-dash.py --use-segment-timeline -o ${outputFilePath} /videos/dash/fragmentado/${parsedFile.name}_1000k-frag.mp4 /videos/dash/fragmentado/${parsedFile.name}_500k-frag.mp4 /videos/dash/fragmentado/${parsedFile.name}_250k-frag.mp4`;
      } else {
        let command=`ffmpeg -y -i ${videoFile} ${outputFilePathmp4} && ffmpeg -i ${outputFilePathmp4} -c:v libx264 -r 24 -g 24 -b:v 1000k -maxrate 1000k -bufsize 2000k /videos/dash/${parsedFile.name}-1000k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-1000k.mp4 /videos/dash/fragmentado/${parsedFile.name}_1000k-frag.mp4 &&
                     ffmpeg -i ${outputFilePathmp4} -c:v libx264 -r 24 -g 24 -b:v 500k -maxrate 500k -bufsize 1000k /videos/dash/${parsedFile.name}-500k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-500k.mp4 /videos/dash/fragmentado/${parsedFile.name}_500k-frag.mp4 &&
                     ffmpeg -i  ${outputFilePathmp4} -c:v libx264 -r 24 -g 24 -b:v 250k -maxrate 250k -bufsize 500k /videos/dash/${parsedFile.name}-250k.mp4 && bento4/bin/mp4fragment --fragment-duration 2000 /videos/dash/${parsedFile.name}-250k.mp4 /videos/dash/fragmentado/${parsedFile.name}_250k-frag.mp4 &&
                    python bento4/utils/mp4-dash.py --use-segment-timeline -o ${outputFilePath} /videos/dash/fragmentado/${parsedFile.name}_1000k-frag.mp4 /videos/dash/fragmentado/${parsedFile.name}_500k-frag.mp4 /videos/dash/fragmentado/${parsedFile.name}_250k-frag.mp4`;
      }    

                    
      // Encode
 
      
      child_process.exec(command, (err, stdout, stderr) => {
        if (err) {
          return reject(new Error(`Encoding error. ${stderr}`));
        }
        resolve(outputFilePath)
       
      });

   
    });
    
}


  


  Just in case, it gives me problems in line child_process.exec(command, (err, stdout, stderr). Thanks !

  


• How do I generate a file M3U8 compatible with fmp4 ?

  18 janvier 2019, par Dop

  I have a streaming solution that use MPEG-Dash protocol, and I would like to expose the same files on hls for IOS devices.

  I read that fmp4 is now compatible with hls, so I thought that this could be done

  When I generate may mpd file with this command :

  MP4Box -dash 33000 -frag 33000 -out video.mpd -profile dashavc264:onDemand original.mp4#audio original.mp4#video

  what I want is to not duplicate files, and use my generated Dash files with a HLS manifest file.

• Compiling ffmpeg for iOS and gas-preprocessor.pl

  16 mai 2017, par user500

  I want to compile ffmpeg for iOS. I did it a few times before. But now I’m on clean new Mavericks and on configure I’m always getting

  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  
  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  
  GNU assembler not found, install gas-preprocessor
  
  
  
  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.

  I have current Xcode installed. Also brews. And current gas-preprocessor.pl (https://github.com/yuvi/gas-preprocessor) in usr/bin and also in usr/local/bin.

  ---

  On perl /usr/bin/gas-preprocessor.pl gcc I’m getting Unrecognized input filetype at /usr/bin/gas-preprocessor.pl line 33.

  ---

  This config works :

  ./configure \
  
  --extra-cflags='-arch arm64 -mios-version-min=7.0 -mthumb' \
  
  --extra-ldflags='-arch arm64 -mios-version-min=7.0' \
  
  --enable-cross-compile \
  
  --arch=arm64 \
  
  --target-os=darwin \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk \
  
  --prefix=arm64 \
  
  --disable-doc \
  
  --disable-shared \
  
  --disable-everything \
  
  --enable-static \
  
  --enable-pic \
  
  --disable-muxers \
  
  --enable-muxer=flv \
  
  --disable-demuxers \
  
  --enable-demuxer=h264 \
  
  --enable-demuxer=pcm_s16le \
  
  --disable-devices \
  
  --disable-parsers \
  
  --enable-parser=h264 \
  
  --disable-encoders \
  
  --enable-encoder=aac \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=pcm_s16le \
  
  --disable-protocols \
  
  --enable-protocol=rtmp \
  
  --disable-filters \
  
  --disable-bsfs

  ---

  This config throws error above (GNU assembler not found, install gas-preprocessor) :

  ./configure \
  
  --cpu=cortex-a8 \
  
  --extra-cflags='-arch armv7 -mios-version-min=7.0 -mthumb' \
  
  --extra-ldflags='-arch armv7 -mios-version-min=7.0' \
  
  --enable-cross-compile \
  
  --arch=armv7 \
  
  --target-os=darwin \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk \
  
  --prefix=armv7 \
  
  --disable-doc \
  
  --disable-shared \
  
  --disable-everything \
  
  --enable-static \
  
  --enable-pic \
  
  --disable-muxers \
  
  --enable-muxer=flv \
  
  --disable-demuxers \
  
  --enable-demuxer=h264 \
  
  --enable-demuxer=pcm_s16le \
  
  --disable-devices \
  
  --disable-parsers \
  
  --enable-parser=h264 \
  
  --disable-encoders \
  
  --enable-encoder=aac \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=pcm_s16le \
  
  --disable-protocols \
  
  --enable-protocol=rtmp \
  
  --disable-filters \
  
  --disable-bsfs