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• compile the examples of ffmpeg in C99 get wrong info

  29 janvier 2016, par Daniel

  I can run "make examples" using the ffmpeg build environment to get the .o files.
  But I cannot compile using C99. The operating system I use is Ubuntu 14.04 and I configure ffmpeg following Installation of FFmpeg-2.8.5 in linux, installing it without error.

  Here is the detail(demuxing_decoding demuxing_decoding.c is in the ffmpeg_souce_folder/doc/examples) :

   c99 -o demuxing_decoding demuxing_decoding.c -lavdevice -lavformat -lavcodec -lavfilter 
  
  -lavutil -lswresample -lswscale -lz -lbz2

  demuxing_decoding.c: In function ‘main’:
  
  demuxing_decoding.c:326:9: warning: ‘avcodec_alloc_frame’ is deprecated (declared at /usr/include/libavcodec/avcodec.h:3927) [-Wdeprecated-declarations]
  
           frame = avcodec_alloc_frame();
  
           ^
  
  demuxing_decoding.c:406:9: warning: ‘avcodec_free_frame’ is deprecated (declared at /usr/include/libavcodec/avcodec.h:3952) [-Wdeprecated-declarations]
  
           avcodec_free_frame(&frame);
  
           ^
  
  /tmp/ccgEq0Zc.o: In function `decode_packet':
  
  demuxing_decoding.c:(.text+0x561): undefined reference to `av_frame_unref'
  
  /tmp/ccgEq0Zc.o: In function `open_codec_context':
  
  demuxing_decoding.c:(.text+0x5f4): undefined reference to `av_get_media_type_string'
  
  demuxing_decoding.c:(.text+0x66c): undefined reference to `av_get_media_type_string'
  
  demuxing_decoding.c:(.text+0x6df): undefined reference to `av_get_media_type_string'
  
  /tmp/ccgEq0Zc.o: In function `main':
  
  demuxing_decoding.c:(.text+0xcc1): undefined reference to `av_frame_alloc'
  
  demuxing_decoding.c:(.text+0x1082): undefined reference to `av_frame_free'
  
  collect2: error: ld returned 1 exit status

  I don’t where is wrong...I’ve got stuck for two days...Needing your help. Thanks a lot !

• How do you use Node.js to stream an MP4 file with ffmpeg ?

  2 novembre 2016, par LaserJesus

  I’ve been trying to solve this problem for several days now and would really appreciate any help on the subject.

  I’m able to successfully stream an mp4 audio file stored on a Node.js server using fluent-ffmpeg by passing the location of the file as a string and transcoding it to mp3. If I create a file stream from the same file and pass that to fluent-ffmpeg instead it works for an mp3 input file, but not a mp4 file. In the case of the mp4 file no error is thrown and it claims the stream completed successfully, but nothing is playing in the browser. I’m guessing this has to do with the meta data being stored at the end of an mp4 file, but I don’t know how to code around this. This is the exact same file that works correctly when it’s location is passed to ffmpeg, rather than the stream. When I try and pass a stream to the mp4 file on s3, again no error is thrown, but nothing streams to the browser. This isn’t surprising as ffmpeg won’t work with the file locally as stream, so expecting it to handle the stream from s3 is wishful thinking.

  How can I stream the mp4 file from s3, without storing it locally as a file first ? How do I get ffmpeg to do this without transcoding the file too ? The following is the code I have at the moment which isn’t working. Note that it attempts to pass the s3 file as a stream to ffmpeg and it’s also transcoding it into an mp3, which I’d prefer not to do.

  .get(function(req,res) {
  
      aws.s3(s3Bucket).getFile(s3Path, function (err, result) {
  
          if (err) {
  
              return next(err);
  
          }
  
          var proc = new ffmpeg(result)
  
              .withAudioCodec('libmp3lame')
  
              .format('mp3')
  
              .on('error', function (err, stdout, stderr) {
  
                  console.log('an error happened: ' + err.message);
  
                  console.log('ffmpeg stdout: ' + stdout);
  
                  console.log('ffmpeg stderr: ' + stderr);
  
              })
  
              .on('end', function () {
  
                  console.log('Processing finished !');
  
              })
  
              .on('progress', function (progress) {
  
                  console.log('Processing: ' + progress.percent + '% done');
  
              })
  
              .pipe(res, {end: true});
  
      });
  
  });

  This is using the knox library when it calls aws.s3... I’ve also tried writing it using the standard aws sdk for Node.js, as shown below, but I get the same outcome as above.

  var AWS = require('aws-sdk');
  
  
  
  var s3 = new AWS.S3({
  
      accessKeyId: process.env.AWS_ACCESS_KEY_ID,
  
      secretAccessKey: process.env.AWS_SECRET_KEY,
  
      region: process.env.AWS_REGION_ID
  
  });
  
  var fileStream = s3.getObject({
  
          Bucket: s3Bucket,
  
          Key: s3Key
  
      }).createReadStream();
  
  var proc = new ffmpeg(fileStream)
  
      .withAudioCodec('libmp3lame')
  
      .format('mp3')
  
      .on('error', function (err, stdout, stderr) {
  
          console.log('an error happened: ' + err.message);
  
          console.log('ffmpeg stdout: ' + stdout);
  
          console.log('ffmpeg stderr: ' + stderr);
  
      })
  
      .on('end', function () {
  
          console.log('Processing finished !');
  
      })
  
      .on('progress', function (progress) {
  
          console.log('Processing: ' + progress.percent + '% done');
  
      })
  
      .pipe(res, {end: true});

  =====================================

  Updated

  I placed an mp3 file in the same s3 bucket and the code I have here worked and was able to stream the file through to the browser without storing a local copy. So the streaming issues I face have something to do with the mp4/aac container/encoder format.

  I’m still interested in a way to bring the m4a file down from s3 to the Node.js server in it’s entirety, then pass it to ffmpeg for streaming without actually storing the file in the local file system.

  =====================================

  Updated Again

  I’ve managed to get the server streaming the file, as mp4, straight to the browser. This half answers my original question. My only issue now is that I have to download the file to a local store first, before I can stream it. I’d still like to find a way to stream from s3 without needing the temporary file.

  aws.s3(s3Bucket).getFile(s3Path, function(err, result){
  
      result.pipe(fs.createWriteStream(file_location));
  
      result.on('end', function() {
  
          console.log('File Downloaded!');
  
          var proc = new ffmpeg(file_location)
  
              .outputOptions(['-movflags isml+frag_keyframe'])
  
              .toFormat('mp4')
  
              .withAudioCodec('copy')
  
              .seekInput(offset)
  
              .on('error', function(err,stdout,stderr) {
  
                  console.log('an error happened: ' + err.message);
  
                  console.log('ffmpeg stdout: ' + stdout);
  
                  console.log('ffmpeg stderr: ' + stderr);
  
              })
  
              .on('end', function() {
  
                  console.log('Processing finished !');
  
              })
  
              .on('progress', function(progress) {
  
                  console.log('Processing: ' + progress.percent + '% done');
  
              })
  
              .pipe(res, {end: true});
  
      });
  
  });

  On the receiving side I just have the following javascript in an empty html page :

  window.AudioContext = window.AudioContext || window.webkitAudioContext;
  
  context = new AudioContext();
  
  
  
  function process(Data) {
  
      source = context.createBufferSource(); // Create Sound Source
  
      context.decodeAudioData(Data, function(buffer){
  
          source.buffer = buffer;
  
          source.connect(context.destination);
  
          source.start(context.currentTime);
  
      });
  
  };
  
  
  
  function loadSound() {
  
      var request = new XMLHttpRequest();
  
      request.open("GET", "/stream/", true);
  
      request.responseType = "arraybuffer";
  
  
  
      request.onload = function() {
  
          var Data = request.response;
  
          process(Data);
  
      };
  
  
  
      request.send();
  
  };
  
  
  
  loadSound()

  =====================================

  The Answer

  The code above under the title ’updated again’ will stream an mp4 file, from s3, via a Node.js server to a browser without using flash. It does require that the file be stored temporarily on the Node.js server so that the meta data in the file is moved from the end of the file to the front. In order to stream without storing the temporary file, you need to actual modify the file on S3 first and make this meta data change. If you have changed the file in this way on S3 then you can modify the code under the title ’updated again’ so that the result from S3 is piped straight into the ffmpeg constructor, rather than into a file stream on the Node.js server, then providing that file location to ffmepg, as the code does now. You can change the final ’pipe’ command to ’save(location)’ to get a version of the mp4 file locally with the meta data moved to the front. You can then upload that new version of the file to S3 and try out the end to end streaming. Personally I’m now going to create a task that modifies the files in this way as they are uploaded to s3 in the first place. This allows me to record and stream in mp4 without transcoding or storing a temp file on the Node.js server.

• ffmpeg -acodec not found but installed

  16 décembre 2015, par nadermx

  I am trying to change a video url from youtube to a mp3 via ffmpeg so I can stream the response in Ubuntu 14.04

   ffmpeg -i https://r7---sn-ab5l6ne7.googlevideo.com/videoplayback?mime=video%2Fmp4&requiressl=yes&signature=99EFD8B801C44EA1221B5D653B2EB30C4CE962C6.6CD123737E54A11B0E5B16BC7AA2572688B091D9&source=youtube&mn=sn-ab5l6ne7&upn=2c_sPjXh1FE&itag=22&pl=16&mt=1450291179&ms=au&expire=1450312883&mm=31&id=o-ABMSf6BaCXTeSmFM41vs85JJ2rmcdeD6CVriiGKVMDlG&sver=3&ratebypass=yes&ip=68.9.161.152&sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&key=yt6&lmt=1429526600478294&dur=6.385&fexp=9416126%2C9420452%2C9422596%2C9423459%2C9423662&mv=m&ipbits=0&initcwndbps=2147500 -acodec liblamemp3 -f mp3 shave.mp3

  But when I run this command, I end up with this issue

  ffmpeg -i https://r7---sn-ab5l6ne7.googlevideo.com/videoplayback?mime=video%2Fmp4&requiressl=yes&signature=99EFD8B801C44EA1221B5D653B2EB30C4CE962C6.6CD123737E54A11B0E5B16BC7AA2572688B091D9&source=youtube&mn=sn-ab5l6ne7&upn=2c_sPjXh1FE&itag=22&pl=16&mt=1450291179&ms=au&expire=1450312883&mm=31&id=o-ABMSf6BaCXTeSmFM41vs85JJ2rmcdeD6CVriiGKVMDlG&sver=3&ratebypass=yes&ip=68.9.161.152&sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&key=yt6&lmt=1429526600478294&dur=6.385&fexp=9416126%2C9420452%2C9422596%2C9423459%2C9423662&mv=m&ipbits=0&initcwndbps=2147500 -acodec liblamemp3 -f mp3 shave.mp3[19] 8925
  
  [20] 8926
  
  [21] 8927
  
  [22] 8928
  
  [23] 8929
  
  [24] 8930
  
  [25] 8931
  
  [26] 8932
  
  [27] 8933
  
  [28] 8934
  
  [29] 8935
  
  [30] 8936
  
  [31] 8937
  
  [32] 8938
  
  [33] 8939
  
  [34] 8940
  
  [35] 8941
  
  [36] 8942
  
  [37] 8943
  
  [38] 8944
  
  [39] 8945
  
  [40] 8946
  
  [41] 8947
  
  ffmpeg version git-2015-12-10-3652dd5 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-openssl --enable-nonfree --enable-version3 --enable-gnutls
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 19.100 / 57. 19.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 20.100 /  6. 20.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  -acodec: command not found
  
  [20]   Done                    requiressl=yes
  
  [21]   Done                    signature=99EFD8B801C44EA1221B5D653B2EB30C4CE962C6.6CD123737E54A11B0E5B16BC7AA2572688B091D9
  
  [22]   Done                    source=youtube
  
  [23]   Done                    mn=sn-ab5l6ne7
  
  [24]   Done                    upn=2c_sPjXh1FE
  
  [25]   Done                    itag=22
  
  [26]   Done                    pl=16
  
  [27]   Done                    mt=1450291179
  
  [28]   Done                    ms=au
  
  [29]   Done                    expire=1450312883
  
  [30]   Done                    mm=31
  
  [31]   Done                    id=o-ABMSf6BaCXTeSmFM41vs85JJ2rmcdeD6CVriiGKVMDlG
  
  [32]   Done                    sver=3
  
  [33]   Done                    ratebypass=yes
  
  [34]   Done                    ip=68.9.161.152
  
  [35]   Done                    sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire
  
  
  
  [19]+  Stopped                 ffmpeg -i https://r7---sn-ab5l6ne7.googlevideo.com/videoplayback?mime=video%2Fmp4
  
  [20]   Done                    requiressl=yes
  
  [21]   Done                    signature=99EFD8B801C44EA1221B5D653B2EB30C4CE962C6.6CD123737E54A11B0E5B16BC7AA2572688B091D9
  
  [22]   Done                    source=youtube
  
  [23]   Done                    mn=sn-ab5l6ne7
  
  [24]   Done                    upn=2c_sPjXh1FE
  
  [25]   Done                    itag=22
  
  [26]   Done                    pl=16
  
  [27]   Done                    mt=1450291179
  
  [28]   Done                    ms=au
  
  [29]   Done                    expire=1450312883
  
  [30]   Done                    mm=31
  
  [31]   Done                    id=o-ABMSf6BaCXTeSmFM41vs85JJ2rmcdeD6CVriiGKVMDlG
  
  [32]   Done                    sver=3
  
  [33]   Done                    ratebypass=yes
  
  [34]   Done                    ip=68.9.161.152
  
  [35]   Done                    sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire
  
  [36]   Done                    key=yt6
  
  [37]   Done                    lmt=1429526600478294
  
  [38]   Done                    dur=6.385
  
  [39]   Done                    fexp=9416126%2C9420452%2C9422596%2C9423459%2C9423662
  
  [40]   Done                    mv=m
  
  [41]   Done                    ipbits=0

  Now I am not sure why it keeps spitting this out. I have tried to do a streaming output with ’-’ variable as well and still no avail.

  I have installed ffmpeg, and all the dependencies. I used this bash script to compile ffmpeg. I have been trying for days to get this working and still cannot seem to figure it out.