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• how to use the pts in ffmpeg

  11 octobre 2023, par Allan

  I have a library with can provide video data and PTS. The library head file Like this：

  



   /**
 * \brief           Write mirror video H.264 frame to player.
 * \param p_src     Pointer to source buffer.
 * \param size      H.264 frame size. (unit: byte)
 * \param ptsValue  PTS value.
 * \return          Copied size. (unit: byte)
 */
int (*WriteMirrorVideoData)(const std::string& ip, const void *p_src, int size, double ptsValue);


  



  As you see, the library give me video frame buffer address and PTS.

  



  I use FFMpeg to decode video data correctly.

  



  My question is how to control the display time by ptsValue which provided by library.

  



  Did I need to set the ptsValue to AVFrame ? then FFMPeg can control the display time itself.
Or I need to control the display by my own code ?

  



  I am a newer to FFMpeg. please help me. Thank you very much !

  


• Setting up RTP on Nginx

  2 février 2021, par Swap

  I'm trying to use Janus Media Server to relay WebRTC streams to a particular RTP host/port, from where ffmpeg can pick it up as an input and convert it further to an rtmp stream, which can then be used to broadcast to various social media platforms (such as, YouTube, Twitch, Facebook, etc.)

  


  My inspiration for this has been the following blog - https://www.meetecho.com/blog/firefox-webrtc-youtube-kinda/

  


  Specifically, I'm trying to replicate the following architecture -

  


  

  


  And Janus, as per their documentation, has a very neat API for doing it -

  


  {&#xA;    "request" : "rtp_forward",&#xA;    "room" : <unique numeric="numeric" of="of" the="the" room="room" publisher="publisher" is="is" in="in">,&#xA;    "publisher_id" : <unique numeric="numeric" of="of" the="the" publisher="publisher" to="to" relay="relay" externally="externally">,&#xA;    "host" : "<host address="address" to="to" forward="forward" the="the" rtp="rtp" and="and" packets="packets">",&#xA;    "host_family" : "",&#xA;    "audio_port" : <port to="to" forward="forward" the="the" audio="audio" rtp="rtp" packets="packets">,&#xA;    "audio_ssrc" : <audio ssrc="ssrc" to="to" use="use" when="when" optional="optional">,&#xA;    "audio_pt" : <audio payload="payload" type="type" to="to" use="use" when="when" optional="optional">,&#xA;    "audio_rtcp_port" : <port to="to" contact="contact" receive="receive" audio="audio" rtcp="rtcp" feedback="feedback" from="from" the="the" and="and" currently="currently" unused="unused" for="for">,&#xA;    "video_port" : <port to="to" forward="forward" the="the" video="video" rtp="rtp" packets="packets">,&#xA;    "video_ssrc" : <video ssrc="ssrc" to="to" use="use" when="when" optional="optional">,&#xA;    "video_pt" : <video payload="payload" type="type" to="to" use="use" when="when" optional="optional">,&#xA;    "video_rtcp_port" : <port to="to" contact="contact" receive="receive" video="video" rtcp="rtcp" feedback="feedback" from="from" the="the" optional="optional">,&#xA;    "simulcast" : ,&#xA;    "video_port_2" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" port="port" to="to" forward="forward" the="the" video="video" rtp="rtp" packets="packets" from="from" second="second" substream="substream"></if>layer to>,&#xA;    "video_ssrc_2" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" video="video" ssrc="ssrc" to="to" use="use" the="the" second="second" substream="substream"></if>layer; optional>,&#xA;    "video_pt_2" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" video="video" payload="payload" type="type" to="to" use="use" the="the" second="second" substream="substream"></if>layer; optional>,&#xA;    "video_port_3" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" port="port" to="to" forward="forward" the="the" video="video" rtp="rtp" packets="packets" from="from" third="third" substream="substream"></if>layer to>,&#xA;    "video_ssrc_3" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" video="video" ssrc="ssrc" to="to" use="use" the="the" third="third" substream="substream"></if>layer; optional>,&#xA;    "video_pt_3" : <if simulcasting="simulcasting" and="and" forwarding="forwarding" each="each" video="video" payload="payload" type="type" to="to" use="use" the="the" third="third" substream="substream"></if>layer; optional>,&#xA;    "data_port" : <port to="to" forward="forward" the="the" messages="messages">,&#xA;    "srtp_suite" : <length of="of" authentication="authentication" tag="tag" or="or" optional="optional">,&#xA;    "srtp_crypto" : "<key to="to" use="use" as="as" crypto="crypto" encoded="encoded" key="key" in="in" optional="optional">"&#xA;}&#xA;</key></length></port></port></video></video></port></port></audio></audio></port></host></unique></unique>

  


  For this, I've setup a Nginx server, where I've also installed Janus and everything's been running smoothly so far. But I'm quite clueless as to how to setup my Nginx server so that it accepts RTP connections (which will be forwarded as RTMP using ffmpeg).

  


  Please guide me to any relevant resources that would help me achieve this. Thanks in advance !

  


• Cannot open connection tcp ://localhost:1935 when to set up custom RTMP stream server

  8 janvier 2021, par showkey

  My simple network is as following :

  


  192.168.31.52 is my local pc 
192.168.31.251 is an ip camera.


  


  I can open the stream rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0 with SMPlayer.
  
Build my nginx for customizing RTMP stream this way.

  


  sudo apt update
sudo apt install build-essential git
sudo apt install libpcre3-dev libssl-dev zlib1g-dev 
git clone https://github.com/arut/nginx-rtmp-module.git
git clone https://github.com/nginx/nginx.git
cd nginx
./auto/configure --add-module=../nginx-rtmp-module
make
sudo make install


  


  Set config file for nginx :

  


  sudo vim /usr/local/nginx/conf/nginx.conf
rtmp { 
    server { 
        listen 1935; 
        application live { 
            live on; 
            interleave on;
 
            hls on; 
            hls_path /tmp/hls; 
            hls_fragment 15s; 
        } 
    } 
} 


  


  Then set permission for nginx :

  


  mkdir /tmp/hls
sudo chmod -R 755  /tmp/hls
sudo chown -R www-data:www-data  /tmp/hls


  


  Edit index.html in /tmp/hls.

  


  <p>test for nginx</p>&#xA;

  


  Both 127.0.0.1/index.html and 192.168.31.52/index.html can open the /tmp/hls/index.html.

  


  Now open port 1935 on my network :

  


  sudo firewall-cmd --zone=public --add-port=1935/tcp --permanent
sudo firewall-cmd --reload 
sudo firewall-cmd --list-ports | grep 1935
1935/tcp


  


  Start nginx :

  


  sudo systemctl start nginx


  


  Up stream the rtsp stream from ip camera—192.168.31.251 to local pc —192.168.31.52.

  


  input="rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0"
output="rtmp://192.168.31.52:1935/live/sample"
ffmpeg -i $input -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -r 25 -b:v 500k -s 640*480 -f flv $output


  


  It encounter the following errors :

  


  [tcp @ 0x59fb700] Connection to tcp://192.168.31.52:1935 failed: Connection refused
[rtmp @ 0x59fc5c0] Cannot open connection tcp://192.168.31.52:1935
rtmp://192.168.31.52:1935/live/sample: Connection refused


  


  To keep the issue simple,i replace $input with a mp4 file in local pc,same error info.
  
How can fix it ?
  
Ping my machine :

  


  ping 192.168.31.52
PING 192.168.31.52 (192.168.31.52): 56 data bytes
64 bytes from 192.168.31.52: icmp_seq=0 ttl=64 time=0.108 ms
64 bytes from 192.168.31.52: icmp_seq=1 ttl=64 time=0.107 ms
64 bytes from 192.168.31.52: icmp_seq=2 ttl=64 time=0.111 ms


  


  Why the port 1935 not opened,i had restarted nginx after setting ?

  


  sudo lsof -i:1935
#nothing in the output
netstat -ltn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:51413           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:1080          0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:8123          0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:8384          0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:9091            0.0.0.0:*               LISTEN     
tcp6       0      0 :::3306                 :::*                    LISTEN     
tcp6       0      0 :::80                   :::*                    LISTEN     
tcp6       0      0 :::22000                :::*                    LISTEN     
tcp6       0      0 :::51413                :::*                    LISTEN     
tcp6       0      0 :::21                   :::*                    LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:25                  :::*                    LISTEN     
tcp6       0      0 :::2681                 :::*                    LISTEN  


  


  Firewall command can't work :

  


  sudo firewall-cmd --zone=public --add-port=1935/tcp --permanent
sudo firewall-cmd --reload 


  


  My nginx version :

  


  sudo nginx -v
nginx version: nginx/1.10.3