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• Using ffmpeg with libfdk-aac, encoding HE-AAC v1 and mono actually, but in decoding ffmpeg show HE-AAC v2 and stereo [closed]

  13 novembre 2024, par olojzyg

  ffmpeg encode command :

  


  


  ffmpeg -i aac_128000_f32le_22050_1.wav -c:a libfdk_aac -profile:a
aac_he -b:a 64k -channels 1 test.aac

  


  


  output :

  


  [aist#0:0/pcm_s16le @ 000001d38ecfe340] Guessed Channel Layout: mono
  Input #0, wav, from 'aac_128000_f32le_22050_1.wav':   Duration: 00:00:06.48, bitrate: 359 kb/s
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (libfdk_aac)) 
  Press [q] to stop, [?] for help Output #0, adts, to 'test.aac':
  Metadata:
        encoder         : Lavf61.7.100   
        Stream #0:0: Audio: aac (HE-AAC), 22050 Hz, mono, s16, 64 kb/s
          Metadata:
            encoder         : Lavc61.19.100 libfdk_aac 
[out#0/adts @ 000001d38ecf8680] video:0KiB audio:53KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.000000%
 size=      53KiB time=00:00:06.47 bitrate=  67.0kbits/s speed= 296x


  


  but decode this test.aac, I think HE-AAC and mono is corrent, but it show HE-AAC v2 and stereo, why ?
decode command :

  


  


  ffmpeg -i test.aac -f null -

  


  


  decode output :

  


  [aac @ 0000020ffcab3d40] Estimating duration from bitrate, this may be inaccurate
 Input #0, aac, from 'test.aac':   Duration: 00:00:06.78, bitrate: 63 kb/s
 Stream #0:0: Audio: aac (HE-AACv2), 22050 Hz, stereo, fltp, 63 kb/s
 Stream mapping:
 Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help Output
#0, null, to 'pipe:':
   Metadata:
    encoder         : Lavf61.7.100
   Stream #0:0: Audio: pcm_s16le, 22050 Hz, stereo, s16, 705 kb/s
      Metadata:
        encoder         : Lavc61.19.100 pcm_s16le
[out#0/null @ 0000020ffcac8bc0] video:0KiB audio:584KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
size=N/A time=00:00:06.78 bitrate=N/A speed=1.6e+03x


  


  what happened ? test.aac is also displayed as 2 channels in Audition. But 1 channel is displayed in MediaInfo, and ADTS header is corrent :

  


  


  channel_configuration : 1 (0x1) - (3 bits)

  


  


• RTSP stream exited with error" : Connection timed out

  21 février 2020, par fw08

  I am building an web application on AWS Cloud that requires to stream a recorded/live video over the global network. I purchased an IP camera(GV-AVD4710) and NVR(GV-SNVR0811) for our application. In future I need to stream no. of cameras on my application.

  While Camera in use With NVR, I have connected the NVR in our local network and the camera at channel_1 of NVR. Now the lets assume NVR is getting an IP of 192.168.1.203. So for rtsp streaming URL for channel_1 will be "rtsp://id:password@192.168.1.203:554/ch1" as per manufacturer’s specification. For camera streaming I am using "ffmpeg" multimedia framework (https://github.com/xpcrts/Steaming-IP-Camera-Nodejs ). So it is working fine. I tested it and working well in local network. Code that is running on the server

  Stream = require('node-rtsp-stream')
  
  stream = new Stream({
  
      name: 'name',
  
      streamUrl: 'rtsp://ID:PASSWORD@abcxyz.com:554/ch1',
  
      wsPort:3000,
  
      ffmpegOptions: {
  
          '-stats': '',
  
          '-r': 30
  
      }
  
  })

  and Code running at client side which is independent of any plug-ins

  <div>
  
         <canvas width="auto" height="auto"></canvas>
  
         <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/jsmpeg.min.js'&gt;&lt;/script&gt;
         
  &lt;script type=&quot;text/javascript&quot;&gt;<br />
  
              var canvas = document.getElementById('chanel1');<br />
  
              var websocket = new WebSocket(&quot;ws://34.202.222.188:3000&quot;);<br />
  
              var player= new jsmpeg(websocket, {canvas:canvas, autoplay:true, loop:true})<br />
  
         &lt;/script&gt;
  

  When I made this IP address available for public, and then the problem begins. It is not working and giving an error :

   "[tcp @ 0x563911f0a340] Connection to tcp://192.168.1.205:554?timeout=0 failed: Connection timed out
  
  rtsp://admin:admin@192.168.1.205: Connection timed out RTSP stream exited with error"

  In Camera Without NVR, I connected camera directly to our local network and so got an rtsp url like rtsp ://id:password@192.168.1.205/media/video1. Same happens again. Works well in local, but not working when I am making this available on public network.

  How can stream video over global network ? Is it possible to implement these logic using ffmpeg multimedia framework ? Does VLC can help in these cases ?

  I would like to reiterate that, In future there are no. of cameras needs to be stream.