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• avformat/avformat.h : Correct some comments

  9 août 2019, par Andreas Rheinhardt

  avformat/avformat.h : Correct some comments
  1. When set_parameters was removed from AVOutputFormat in 2fb75019, it
  
  was forgotten to remove the comment pertaining to it. Said comment now
  
  appeared to apply to interleave_packet() ; it is of course nonsense and
  
  has been replaced by an accurate description.
  
  2. The description of av_write_uncoded_frame() suggested
  
  av_interleaved_write_frame() as a replacement if the input is not
  
  already correctly interleaved ; it also referred to said function for
  
  details. Given that said function can't write AVFrames and that the
  
  specifics of writing uncoded frames are explained in the description
  
  of av_interleaved_write_uncoded_frame(), both references have been fixed.
  
  3. Removed an outdated comment about avformat_seek_file().
  Reviewed-by : Marton Balint <cus@passwd.hu>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/avformat.h

• NodeJS - piping multiple FFMPEG processes

  8 février 2017, par Alaska

  I am trying to programm an converter which can take any video source and convert it to mp3. The mp3 should be saved on my hard drive, or in an buffer to send it via telegram.

  It works good so far, the only problem I am facing is that it can only take one video at a time, and I don’t know why.

  // IMPORTS
  
  var fs = require('fs');
  
  var https = require('https');
  
  var child_process = require('child_process');
  
  
  
  // EVENTEMITER (Not used so far)
  
  var util = require('util');
  
  var EventEmitter = require('events').EventEmitter;
  
  
  
  
  
  // STREAMHANDLER
  
  var StreamHandler = function(url, name){
  
  
  
      // VARIABLES
  
      self = this;
  
      this.url = url;
  
      this.name = name;
  
  
  
      // CREATE FFMPEG PROCESS
  
      var spawn = child_process.spawn;
  
      var args = ['-i', 'pipe:0', '-f', 'mp3', '-ac', '2', '-ab', '128k', '-acodec', 'libmp3lame', 'pipe:1'];
  
      this.ffmpeg = spawn('ffmpeg', args);
  
  
  
      // GRAB STREAM
  
      https.get(url, function(res) {
  
          res.pipe(self.ffmpeg.stdin);
  
      });
  
  
  
      // WRITE TO FILE
  
      this.ffmpeg.stdout.pipe(fs.createWriteStream(name));
  
  
  
      //DEBUG
  
      this.ffmpeg.stdout.on("data", function (data) {
  
         console.error(self.name);
  
      });
  
  }
  
  
  
  util.inherits(StreamHandler, EventEmitter);
  
  
  
  
  
  // TESTING
  
  var test1 = new StreamHandler(vidUrl, "test1.mp3");
  
  test1.ffmpeg.on("exit", function (code, name, signal) {
  
      console.log("Finished: " + test1.name);
  
  });
  
  
  
  var test2 = new StreamHandler(vidUrl, "test2.mp3");
  
  test2.ffmpeg.on("exit", function (code, name, signal) {
  
      console.log("Finished: " + test2.name);
  
  });

  It skips test1.mp3 and only converts test2.mp3, but 2 ffmpeg processes were created :
  

  After test2.mp3 is converted the other ffmpeg thread stays open, but does nothing, and the node program gets stuck waiting (i guess so) for it to send something.

  I hope someone can help me :)

• ffmpeg errors in the daemon

  3 octobre 2020, par smoto_shei

  I created a shell script to compress a video using ffmpeg(4.3.1).

  


  ffmpeg -y -i \
 '/var/www/System/Backend/Outputs/TempSaveMovie/200703_4_short_5fr_p2(100_20)_r(50_20).mp4' \
 -vcodec h264 -an \
 '/var/www/System/Backend/Outputs/MovieOutputs/200703_4_short_5fr_p2(100_20)_r(50_20).mp4'



  


  If you run this code from the console, it will run without problems.
In fact, we're using the python subscript.call() to execute it. It works fine too.

  


  cmd = 'sh /var/www/System/Backend/cv2toffmpeg.sh'
subprocess.call(cmd, shell=True)


  


  Secondly, if I run it from a daemonized python program, I'll get an error. I get the following error.
You'll get an error like this

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Outputs/TempSaveMovie/200703_4_short_5fr_p2(100_20)_r(50_20).mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.35.100
  Duration: 00:00:06.15, start: 0.000000, bitrate: 10246 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 10244 kb/s, 13 fps, 13 tbr, 13312 tbn, 13 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
[mpeg4 @ 0x55cec17c5480] header damaged
[mpeg4 @ 0x55cec17c6840] header damaged
[mpeg4 @ 0x55cec1855f80] header damaged
[mpeg4 @ 0x55cec1866e00] header damaged
Output #0, mp4, to './Outputs/MovieOutputs/200703_4_short_5fr_p2(100_20)_r(50_20).mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 13 fps, 13312 tbn, 13 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.91.100 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: N/A
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg4 @ 0x55cec17c8780] header damaged
Error while decoding stream #0:0: Invalid data found when processing input
[mpeg4 @ 0x55cec17c5480] header damaged


  


  I think the problem is when you run it from a daemonized process. There seems to be a similar problem in the past.
Ffmpeg does not properly convert videos when run as daemon
I would like to ask for your help to solve this problem. Thank you for your help from Japan.