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• Did not able to pipe output of the ffmpeg using nodejs stdout

  4 mars 2014, par rughimire

  I am not being able to pipe the output of the ffmpeg over a stdout.

  Following are the block of code what I coded so far.

      var http = require('http')
  
      , fs = require('fs') 
  
      var child_process = require("child_process")
  
  
  
      http.createServer(function (req, res) {
  
      console.log("Request:", dump_req(req) , "\n")
  
  
  
      // path of the 
  
      var path = 'test-mp4.mp4'  //test-mp4-long.mp4
  
      , stat = fs.statSync(path)
  
      , total = stat.size
  
  
  
  
  
      var range = req.headers.range
  
      , parts = range.replace(/bytes=/, "").split("-")
  
      , partialstart = parts[0]
  
      , partialend = parts[1]
  
      , start = parseInt(partialstart, 10)
  
      , end = partialend ? parseInt(partialend, 10) : total-1
  
      , chunksize = (end-start)+1
  
  
  
  
  
      console.log('RANGE: ' + start + ' - ' + end + ' = ' + chunksize +  "\n")
  
  
  
  
  
      var ffmpeg = child_process.spawn("ffmpeg",[
  
              "-i", path,             // path
  
              "-b:v" , "64k",         // bitrate to 64k
  
              "-bufsize", "64k", 
  
              "-"                     // Output to STDOUT
  
          ]);
  
  
  
  
  
      //set header
  
      res.writeHead(206
  
      , { 'Content-Range': 'bytes ' + start + '-' + end + '/' + total
  
      , 'Accept-Ranges': 'bytes', 'Content-Length': chunksize
  
      , 'Content-Type': 'video/mp4'
  
      })
  
  
  
      stdout[ params[1] ] = ffmpeg.stdout
  
  
  
      // Pipe the video output to the client response
  
      ffmpeg.stdout.pipe(res);
  
  
  
      console.log("Response", dump_res(res), "\n")
  
      }).listen(1337)

  When i replaced the ffmpeg stuffs from above code, all works fine. Following is the part of the code when i replace the ffmpeg stuffs.

   var file = fs.createReadStream(path, {start: start, end: end})

  And piping like :

  file.pipe(res)

  What wrong I am running ?

  Edit :
  The ffmpeg command works fine. I have tested this through the command line and generating proper output.

• Batch script for creating QCTools reports

  26 décembre 2019, par avfool

  I’m new here and new to bash scripting and have been having trouble with a script to do batch QCTools reports using ffprobe. Hoping someone can tell me what I’m getting wrong.

  I’ve been using ffmpovisr for help with creating scripts for transcoding folders full of video files. I’ve been successful with this and now would really like to generate QCTools reports for all the video files in a folder as well.

  I’m starting with this command line, which I use to run transcodes :

  for file in *.mov ; do ffmpeg -i "$file" -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 -slices 16 -c:a copy "$file%.mov.mkv" ; done

  I’m trying to modify it to include the QCTools report command line which is :

  ffprobe -f lavfi -i "movie=input_file:s=v+a[in0][in1], [in0]signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b] ;[a]field=top[a1] ;[b]field=bottom, split[b1][b2] ;[a1][b1]psnr[c1] ;[c1][b2]ssim[out0] ;[in1]ebur128=metadata=1, astats=metadata=1:reset=1:length=0.4[out1]" -show_frames -show_versions -of xml=x=1:q=1 -noprivate | gzip > input_file.qctools.xml.gz

  What I’ve ended up with looks like this :

  for file in *.mov ; do ffprobe -f lavfi -i "movie="$file":s=v+a[in0][in1], [in0]signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b] ;[a]field=top[a1] ;[b]field=bottom, split[b1][b2] ;[a1][b1]psnr[c1] ;[c1][b2]ssim[out0] ;[in1]ebur128=metadata=1, astats=metadata=1:reset=1:length=0.4[out1]" -show_frames -show_versions -of xml=x=1:q=1 -noprivate | gzip > “$file%.mov.qctools.xml.gz” ; done

  I’ve messed around with various parts of this to try to get it to work and I just can’t figure out where the problem is. Any suggestions would be greatly appreciated !

• avutil/utils : check that size_t is unsigned

  26 octobre 2013, par Michael Niedermayer

  avutil/utils : check that size_t is unsigned
  ANSI/ISO C guarantee this, yet there is evidence that there exist
  
  platforms where its not so.
  
  See : http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/library_30.html
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavutil/utils.c