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• How to transcode MP3 files in django by using FFMPEG, Celery and RabbitMQ ?

  12 janvier 2017, par Srinivas 25

  I am trying to transcode user uploaded MP3 audio files into ogg, ac3 wav or other formats by using django, celery, rabbitMQ and FFMPEG. But i am getting the error with [WinError 10042] An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call

  OS-Window 10-64bit
  Python 3.0
  Django - 1.10

  here is the code I followed :

  models.py
  
  import uuid
  
  from django.db import models
  
  
  
     # Create your models here.
  
  
  
      def unique_file_path(instance, filename):
  
      new_file_name = uuid.uuid4()
  
      return str(new_file_name)
  
  
  
      class AudioFile(models.Model):
  
      name = models.CharField(max_length=100, blank=True)
  
      mp3_file = models.FileField(upload_to=unique_file_path)
  
      ogg_file = models.FileField(blank=True, upload_to=unique_file_path)
  
      wav_file = models.FileField(blank=True, upload_to=unique_file_path)
  
      ac3_file = models.FileField(blank=True, upload_to=unique_file_path)
  
  
  
      def __str__(self):
  
          return self.name
  
  
  
      views.py
  
      from django.shortcuts import render
  
  
  
      # Create your views here.
  
  
  
      from django.views.generic.edit import FormView
  
      from django.http import HttpResponseRedirect
  
      from django.core.urlresolvers import reverse
  
  
  
      from django.views.generic import FormView
  
      from audio_transcoder.taskapp.tasks import transcode_mp3
  
  
  
      from .forms import AudioFileFrom
  
      from .models import AudioFile
  
  
  
      class UploadAudioFileView(FormView):
  
      template_name = 'upload/upload.html'
  
      form_class = AudioFileFrom
  
  
  
  
  
      def form_valid(self, form):
  
          audio_file = AudioFile(
  
              name=self.get_form_kwargs().get('data')['name'],
  
              mp3_file=self.get_form_kwargs().get('files')['mp3_file']
  
          )
  
          audio_file.save()
  
          transcode_mp3.delay(audio_file.id)
  
  
  
          return HttpResponseRedirect(self.get_success_url())
  
  
  
      def get_success_url(self):
  
          return reverse('/')
  
  
  
  
  
      tasks.py
  
      import os
  
      import os.path
  
      import subprocess
  
  
  
      from audio_transcoder.taskapp.celery import app
  
  
  
  
  
  
  
  
  
      from celery import Celery
  
  
  
      app = Celery('fftest',
  
               broker='amqp://guest@localhost//',
  
               include=['taskapp.tasks'])
  
  
  
      if __name__ == '__main__':
  
      app.start()
  
  
  
      from audio_transcoder.models import AudioFile
  
      import fftest.settings as settings
  
  
  
      @app.task
  
      def transcode_mp3(mp3_id):
  
      audio_file = AudioFile.objects.get(id=mp3_id)
  
      input_file_path = audio_file.mp3_file.path
  
      filename = os.path.basename(input_file_path)
  
  
  
      ogg_output_file_name = os.path.join('transcoded', '{}.ogg'.format(filename))
  
      ogg_output_file_path = os.path.join(settings.MEDIA_ROOT, ogg_`enter code     
  
      here`output_file_name)
  
      enter code here
  
      ac3_output_file_name = os.path.join('transcoded', '{}.ac3'.format(filename))
  
      ac3_output_file_path = os.path.join(settings.MEDIA_ROOT,  
  
      ac3_output_file_name)
  
  
  
      wav_output_file_name = os.path.join('transcoded', '{}.wav'.format(filename))
  
      wav_output_file_path = os.path.join(settings.MEDIA_ROOT, 
  
      wav_output_file_name)
  
  
  
      if not os.path.isdir(os.path.dirname(ogg_output_file_path)):
  
          os.makedirs(os.path.dirname(ogg_output_file_path))
  
  
  
      subprocess.call([
  
              settings.FFMPEG_PATH,
  
              '-i',
  
              input_file_path,
  
              ogg_output_file_path,
  
              ac3_output_file_path,
  
              wav_output_file_path
  
          ]
  
      )
  
  
  
      audio_file.ogg_file = ogg_output_file_name
  
      audio_file.ac3_file = ac3_output_file_name
  
      audio_file.wav_file = wav_output_file_name
  
      audio_file.save()

  Not sure where the mistake is happening. While uploading video it is showing below :

  OperationalError at /new/
  
  [WinError 10042] An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call
  
  Request Method: POST
  
  Request URL:  http://127.0.0.1:8000/new/
  
  Django Version: 1.10.4
  
  Exception Type: OperationalError`enter code here`
  
  Exception Value:  
  
  [WinError 10042] An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call
  
  Exception Location: C:\Users\RAMa2r3e4s5h6\fftest\lib\site-packages\amqp\transport.py in _set_socket_options, line 204

• Approaches To Modifying Game Resource Files

  16 août 2016, par Multimedia Mike — Game Hacking

  I have been assisting The Translator in the translation of another mid-1990s adventure game. This one isn’t quite as multimedia-heavy as the last title, and the challenges are a bit different. I wanted to compose this post in order to describe my thought process and mental model in approaching this problem. Hopefully, this will help some others understand my approach since what I’m doing here often appears as magic to some of my correspondents.

  High Level Model
  At the highest level, it is valuable to understand the code and the data at play. The code is the game’s engine and the data refers to the collection of resources that comprise the game’s graphics, sound, text, and other assets.

  
  
  Simplistic high-level game engine model
  

  Ideally, we want to change the data in such a way that the original game engine adopts it as its own because it has the same format as the original data. It is very undesirable to have to modify the binary engine executable in any way.

  Modifying The Game Data Directly
  How to modify the data ? If we modify the text strings for the sake of language translation, one approach might be to search for strings within the game data files and change them directly. This model assumes that the text strings are stored in a plain, uncompressed format. Some games might store these strings in a text format which can be easily edited with any text editor. Other games will store them as binary data.
  

  In the latter situation, a game hacker can scan through data files with utilities like Unix ‘strings’ to find the resources with the desired strings. Then, use a hex editor to edit the strings directly. For example, change “Original String”…

  0098F800   00 00 00 00  00 00 00 4F  72 69 67 69  6E 61 6C 20  .......Original 
  0098F810   53 74 72 69  6E 67 00 00  00 00 00 00  00 00 00 00  String..........
  

  …to “Short String” and pad the difference in string lengths using spaces (0x20) :

  0098F800   00 00 00 00  00 00 00 53  68 6F 72 74  20 53 74 72  .......Short Str
  0098F810   69 6E 67 20  20 20 00 00  00 00 00 00  00 00 00 00  ing   ..........
  

  This has some obvious problems. First, translated strings need to be of equal our smaller length compared to the original. What if we want to encode “Much Longer String” ?

  0098F800   00 00 00 00  00 00 00 4D  75 63 68 20  4C 6F 6E 67  .......Much Long
  0098F810   65 72 20 53  74 72 00 00  00 00 00 00  00 00 00 00  er Str..........
  

  It won’t fit. The second problem pertains to character set limitations. If the font in use was only designed for ASCII, it’s going to be inadequate for expressing nearly any other language.

  So a better approach is needed.

  Understanding The Data Structures
  An alternative to the approach outlined above is to understand the game’s resources so they can be modified at a deeper level. Here’s a model to motivate this investigation :

  
  
  Model of the game resource archive format
  

  This is a very common layout for such formats : there is a file header, a sequence of resource blocks, and a trailing index which describes the locations and types of the foregoing blocks.

  What use is understanding the data structures ? In doing so, it becomes possible to write new utilities that disassemble the data into individual pieces, modify the necessary pieces, and then reassemble them into a form that the original game engine likes.

  It’s important to take a careful, experimental approach to this since mistakes can be ruthlessly difficult to debug (unless you relish the thought of debugging the control flow through an opaque DOS executable). Thus, the very first goal in all of this is to create a program that can disassemble and reassemble the resource, thus creating an identical resource file. This diagram illustrates this complex initial process :

  
  
  Rewriting the game resource file
  

  So, yeah, this is one of the most complicated “copy file” operations that I can possibly code. But it forms an important basis, since the next step is to carefully replace one piece at a time.

  
  
  Modifying a specific game resource
  

  This diagram shows a simplistic model of a resource block that contains a series of message strings. The header contains pointers to each of the strings within the block. Instead of copying this particular resource block directly to the new file, a proposed modification utility will intercept it and rewrite the entire thing, writing new strings of arbitrary length and creating an adjusted header which will correctly point to the start of each new string. Thus, translated strings can be longer than the original strings.

  Further Work
  Exploiting this same approach, we can intercept and modify other game resources including fonts, images, and anything else that might need to be translated. I will explore specific examples in a later blog post.

  Followup

  • Translating Return to Ringworld, in which I apply the ideas expressed in this post.

  The post Approaches To Modifying Game Resource Files first appeared on Breaking Eggs And Making Omelettes.

• FFMPEG RTSP stream to MPEG4/H264 file using libx264

  4 décembre 2016, par Phi

  Heyo folks,

  I’m attempting to transcode/remux an RTSP stream in H264 format into a MPEG4 container, containing just the H264 video stream. Basically, webcam output into a MP4 container.

  I can get a poorly coded MP4 produced, using this code :

  // Variables here for demo
  
  AVFormatContext * video_file_output_format = nullptr;
  
  AVFormatContext * rtsp_format_context = nullptr;
  
  AVCodecContext * video_file_codec_context = nullptr;
  
  AVCodecContext * rtsp_vidstream_codec_context = nullptr;
  
  AVPacket packet = {0};
  
  AVStream * video_file_stream = nullptr;
  
  AVCodec * rtsp_decoder_codec = nullptr;
  
  int errorNum = 0, video_stream_index = 0;
  
  std::string outputMP4file = "D:\\somemp4file.mp4";
  
  
  
  // begin
  
  AVDictionary * opts = nullptr;
  
  av_dict_set(&opts, "rtsp_transport", "tcp", 0);
  
  
  
  if ((errorNum = avformat_open_input(&rtsp_format_context, uriANSI.c_str(), NULL, &opts)) < 0) {
  
      errOut << "Connection failed: avformat_open_input failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  rtsp_format_context->max_analyze_duration = 50000;
  
  if ((errorNum = avformat_find_stream_info(rtsp_format_context, NULL)) < 0) {
  
      errOut << "Connection failed: avformat_find_stream_info failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  video_stream_index = errorNum = av_find_best_stream(rtsp_format_context, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
  
  
  
  if (video_stream_index < 0) {
  
      errOut << "Connection in unexpected state; made a connection, but there was no video stream.\r\n"
  
          "Attempts to find a video stream resulted in error " << errorNum << ": " << ErrorRead(errorNum);
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  rtsp_vidstream_codec_context = rtsp_format_context->streams[video_stream_index]->codec;
  
  
  
  av_init_packet(&packet);
  
  
  
  if (!(video_file_output_format = av_guess_format(NULL, outputMP4file.c_str(),  NULL))) {
  
      TacticalAbort();
  
      throw std::exception("av_guess_format");
  
  }
  
  
  
  if (!(rtsp_decoder_codec = avcodec_find_decoder(rtsp_vidstream_codec_context->codec_id))) {
  
      errOut << "Connection failed: connected, but avcodec_find_decoder returned null.\r\n"
  
          "Couldn't find codec with an AV_CODEC_ID value of " << rtsp_vidstream_codec_context->codec_id << ".";
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  video_file_format_context = avformat_alloc_context();
  
  video_file_format_context->oformat = video_file_output_format;
  
  
  
  if (strcpy_s(video_file_format_context->filename, sizeof(video_file_format_context->filename), outputMP4file.c_str())) {
  
      errOut << "Couldn't open video file: strcpy_s failed with error " << errno << ".";
  
      std::string log = errOut.str();
  
      TacticalAbort();
  
      throw std::exception("strcpy_s");
  
  }
  
  
  
  if (!(video_file_encoder_codec = avcodec_find_encoder(video_file_output_format->video_codec))) {
  
      TacticalAbort();
  
      throw std::exception("avcodec_find_encoder");
  
  }
  
  
  
  // MARKER ONE
  
  
  
  if (!outputMP4file.empty() &&
  
      !(video_file_output_format->flags & AVFMT_NOFILE) &&
  
      (errorNum = avio_open2(&video_file_format_context->pb, outputMP4file.c_str(), AVIO_FLAG_WRITE, nullptr, &opts)) < 0) {
  
      errOut << "Couldn't open video file \"" << outputMP4file << "\" for writing : avio_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  // Create stream in MP4 file
  
  if (!(video_file_stream = avformat_new_stream(video_file_format_context, video_file_encoder_codec))) {
  
      TacticalAbort();
  
      return;
  
  }
  
  
  
  AVCodecContext * video_file_codec_context = video_file_stream->codec;
  
  
  
  // MARKER TWO
  
  
  
  // error -22/-21 in avio_open2 if this is skipped
  
  if ((errorNum = avcodec_copy_context(video_file_codec_context, rtsp_vidstream_codec_context)) != 0) {
  
      TacticalAbort();
  
      throw std::exception("avcodec_copy_context");
  
  }
  
  
  
  //video_file_codec_context->codec_tag = 0;
  
  
  
  /*
  
  // MARKER 3 - is this not needed? Examples suggest not.
  
  if ((errorNum = avcodec_open2(video_file_codec_context, video_file_encoder_codec, &opts)) < 0)
  
  {
  
      errOut << "Couldn't open video file codec context: avcodec_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
  
      std::string log = errOut.str();
  
      TacticalAbort();
  
      throw std::exception("avcodec_open2, video file");
  
  }*/
  
  
  
  //video_file_format_context->flags |= AVFMT_FLAG_GENPTS;
  
  if (video_file_format_context->oformat->flags & AVFMT_GLOBALHEADER)
  
  {
  
      video_file_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  
  
  if ((errorNum = avformat_write_header(video_file_format_context, &opts)) < 0) {
  
      errOut << "Couldn't open video file: avformat_write_header failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
  
      std::string log = errOut.str();
  
      TacticalAbort();
  
      return;
  
  }

  However, there are several issues :

  1. I can’t pass any x264 options to the output file. The output H264 matches the input H264’s profile/level - switching cameras to a different model switches H264 level.
  2. The timing of the output file is off, noticeably.
  3. The duration of the output file is off, massively. A few seconds of footage becomes hours, although playtime doesn’t match. (FWIW, I’m using VLC to play them.)

  Passing x264 options

  If I manually increment PTS per packet, and set DTS equal to PTS, it plays too fast, 2-3 seconds’ worth of footage in one second playtime, and duration is hours long. The footage also blurs past several seconds, about 10 seconds’ footage in a second.

  If I let FFMPEG decide (with or without GENPTS flag), the file has a variable frame rate (probably as expected), but it plays the whole file in an instant and has a long duration too (over forty hours for a few seconds). The duration isn’t "real", as the file plays in an instant.

  At Marker One, I try to set the profile by passing options to avio_open2. The options are simply ignored by libx264. I’ve tried :

  av_dict_set(&opts, "vprofile", "main", 0);
  
  av_dict_set(&opts, "profile", "main", 0); // error, missing '('
  
  // FF_PROFILE_H264_MAIN equals 77, so I also tried
  
  av_dict_set(&opts, "vprofile", "77", 0); 
  
  av_dict_set(&opts, "profile", "77", 0);

  It does seem to read the profile setting, but it doesn’t use them. At Marker Two, I tried to set it after the avio_open2, before avformat_write_header .

  // I tried all 4 av_dict_set from earlier, passing it to avformat_write_header.
  
  // None had any effect, they weren't consumed.
  
  av_opt_set(video_file_codec_context, "profile", "77", 0);
  
  av_opt_set(video_file_codec_context, "profile", "main", 0);
  
  video_file_codec_context->profile = FF_PROFILE_H264_MAIN;
  
  av_opt_set(video_file_codec_context->priv_data, "profile", "77", 0);
  
  av_opt_set(video_file_codec_context->priv_data, "profile", "main", 0);

  Messing with privdata made the program unstable, but I was trying anything at that point.
  I’d like to solve issue 1 with passing settings, since I imagine it’d bottleneck any attempt to solve issues 2 or 3.

  I’ve been fiddling with this for the better part of a month now. I’ve been through dozens of documentation, Q&As, examples. It doesn’t help that quite a few are outdated.

  Any help would be appreciated.

  Cheers