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• Mingw-w64 - printf does not work

  27 décembre 2013, par Gosha U.

  First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously ! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested !

  I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.

  #include 
  
  #include "cmdutils.h"
  
  
  
  const char program_name[] = "hello";
  
  const int program_birth_year = 2013;
  
  
  
  void show_help_default(const char *opt, const char *arg)
  
  {
  
      printf("zxcvbnm\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      printf("1234567890\n");
  
      return 0;
  
  }

  And after that I created real hello world app with MinGW-w64 and qmake without eny extra libs. And its printf does not work.

  I want to prevent this behavior.

  I want to make printf working in traditional manner.

  How I build FFmpeg :

  PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
  
  SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
  
  ./configure \
  
    --prefix=/home/developer/workspace/MinGW32fs \
  
    --extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
  
    --extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
  
    --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32-  \
  
    --pkg-config=pkg-config   --enable-libtheora --enable-libvorbis --enable-libvpx \
  
    --enable-outdev=sdl --enable-shared --disable-static \
  
    --disable-doc --disable-manpages --disable-podpages
  
  
  
  make

• Rtsp streaming on nodejs - Blank screen

  17 juillet 2024, par theplaceofburak

  I am currently working on a Node.js project where I need to implement streaming using ffmpeg. However, I am facing an issue with the streaming process, as I am getting an empty blank screen instead of the expected video stream.

  


  Here's a brief overview of what I have done so far on the server-side :

  


  Installed ffmpeg and made sure it is accessible in the environment.
Configured the server-side code for the streaming process.
However, despite these efforts, the stream is not working correctly, and I am unable to see the video stream on the client-side.

  


  Server-side code :
app.js

  


  const express = require('express');
const Stream = require('node-rtsp-stream');

const app = express();
const port = 4000;

// Start the RTSP stream
const stream = new Stream({
  name: 'rtsp_server_name',
  streamUrl: 'rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4',
  wsPort: 3000,
  ffmpegOptions: {
    '-stats': '', // an option with no necessary value uses a blank string
    '-r': 30, // options with required values specify the value after the key
  },
});

stream.on('data', data => {
  console.log(data);
});

app.get('/', (req, res) => {
  res.send('Hello World');
});

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}/`);
});


  


  index.html

  


  &#xA;  &#xA;    <canvas></canvas>&#xA;  &#xA;  <h1>Test rtsp video</h1>&#xA;  <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/js/jsmpeg.min.js'&gt;&lt;/script&gt;&#xA;  &lt;script type=&quot;text/javascript&quot;&gt;&amp;#xA;    player = new JSMpeg.Player(&amp;#x27;ws://localhost:3000&amp;#x27;, {&amp;#xA;      canvas: document.getElementById(&amp;#x27;canvas&amp;#x27;), // Canvas should be a canvas DOM element&amp;#xA;    });&amp;#xA;  &lt;/script&gt;&#xA;&#xA;

  


  I got no console error when I open index.html but only get blank black screen
  


  


• FFMPEG - Scrambled Output converting from VOB with ffmpeg

  24 décembre 2013, par MattD

  I've concatenated a series of VOB files from a DVD into a single VOB file and I am trying to convert it to MP4 or other similar format. I see a lot of errors when converting and the output appears scrambled.

  >ffmpeg.exe" -i file.vob -sameq file.mp4
  
  FFmpeg version git-N-29181-ga304071, Copyright (c) 2000-2011 the FFmpeg develope
  
  rs
  
    built on Apr 18 2011 21:24:03 with gcc 4.5.2
  
    configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
  
  ble-memalign-hack --enable-avisynth --enable-bzlib --enable-frei0r --enable-libo
  
  pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --
  
  enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger
  
   --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enabl
  
  e-libx264 --enable-libxavs --enable-libxvid --enable-zlib --cross-prefix=i686-w6
  
  4-mingw32- --target-os=mingw32 --arch=x86_32 --extra-cflags=-I/home/kyle/softwar
  
  e/ffmpeg/external-libraries/win32/include --extra-ldflags=-L/home/kyle/software/
  
  ffmpeg/external-libraries/win32/lib --pkg-config=pkg-config
  
    libavutil    50. 40. 1 / 50. 40. 1
  
    libavcodec   52.120. 0 / 52.120. 0
  
    libavformat  52.108. 0 / 52.108. 0
  
    libavdevice  52.  4. 0 / 52.  4. 0
  
    libavfilter   1. 79. 0 /  1. 79. 0
  
    libswscale    0. 13. 0 /  0. 13. 0
  
  [mpeg2video @ 01751A90] ac-tex damaged at 5 16
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 1
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 2
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 3
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 4
  
  
  
  [...]

  I'm guessing this is CSS scrambling and I need to do some sort of DeCSS. Does FFMpeg have an option for this ? Cringe if you'd like, but is there C# source to achieve this ?

  My end goal is really just to get some DVDs that I own onto my media server. I've tried a few demo-ware products with limited success including Acala DVD Ripper, Click to Disk, AVIDemux to name a few. I even paid for a couple of them to get the full version, but Acala only works for about half of my DVDs and Click to Disk can decode the VOB, but I need to use FFMpeg to convert. I'd like to have it all in one app that works and I am willing to write some code for it.