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• FFMpeg live stream with C++

  21 août 2015, par cahbs

  #include 
  
  extern “C” {
  
  #include “libavformat\avformat.h”
  
  #include “libavdevice\avdevice.h”
  
  }
  
  int main(int argc, char **argv)
  
  {
  
    av_register_all(); 
  
    avcodec_register_all(); 
  
    avdevice_register_all();
  
    avformat_network_init(); 
  
    AvFormatContex *pFormatContex;
  
    pFormatContext = format_alloc_context();
  
    AvInputFormat * a = av_find_input_format(“dshow”);
  
    av_format_open_input(&pFormatCtx, “video””HP Webcam [2 MP Fixed]”””,a,NULL); 
  
  }

  This code is the access web cam.
  I want to live stream on web cam in C++. I can’t get web cam video on web cam.

• HTTP Live Streaming, FFMPEG & FFSERVER, and iPhone OS 3

  17 novembre 2014, par jcnnghm

  In iPhone OS 3, Apple has introduced HTTP Live Streaming which should allow live streaming of video from the internet. I am currently operating a webcam, which feeds into my server, and is then converted into a flv stream by ffmpeg, and streamed back out using ffserver. Does anyone know how to setup a video stream the iPhone can use using ffmpeg and ffserver ? I should be able to re-encode into just about any format on the fly.

• Error while opening encoder for output stream #0:1 Webm VP9 live streaming

  29 août 2019, par Salem

  The source video I use is H264 m3u8 live stream and this is the command I tried

  ffmpeg -re -i "http://sorce.com/live.m3u8" -c:v libvpx-vp9 -s 480x360 -keyint_min 60\
  
  -g 60 -speed 5 -tile-columns 4 -frame-parallel 1 -threads 8 -static-thresh 0 \
  
  -max-intra-rate 300 -deadline realtime -lag-in-frames 0 -error-resilient 1 \
  
  -b:v 300k -c:a libvorbis  -b:a 64k -ar 44100 -f webm_chunk -audio_chunk_duration 2000 \
  
  -header "/var/www/example.com/live/glass_360.hdr" -chunk_start_index 1  \
  
  /var/www/example.com/live/glass_360_%d.chk  

  I pickup this code from wkiki.webmproject.org
  most of the time I got this error message

  [libvorbis @ 0x5617bae0c240] encoder setup failed Error initializing
  
   output stream 0:1 -- Error while opening encoder for output stream
  
   #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  Here is FFMPEG command output

  Input #0, mpegts, from 'http://sorce.com/live.m3u8':
  
    Duration: N/A, start: 1369.000978, bitrate: N/A
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 127 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))
  
    Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))

  I already add video map before video and audio coding argue but I got same error

   -map  0:v:0 -c:v libvpx-vp9 and -map 0:a:0 -c:a libvorbis 

  I tried new broadcast command it works first after I disable the audio

  VP9_DASH_PARAMS="-tile-columns 4 -frame-parallel 1 -speed 6" && \
  
  ffmpeg -y -re -i http://sorce.com/live.m3u8 -c:v libvpx-vp9 -s 480x360 -b:v 150k \
  
  -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 \
  
  video_1280x720_500k.webm && sleep 1 && ffmpeg  -f webm_dash_manifest \ 
  
  -i video_1280x720_500k.webm -c copy -f webm_dash_manifest - \ adaptation_sets "id=0"  manifest.mpd

  this command didn’t create manifest.mpd it created only video_1280x720_500k.webm