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• HTML5 Video tag switcher for multiple resolutions

  20 avril 2016, par somecalmetim

  I have a Rails 4 app setup as a video upload/sharing site. I am using paperclip to upload videos and ffmpeg for processing 2 sizes of video into Mp4, ogg and webm.

  I want to show the smaller 240p video to mobile devices. I can do that now with media queries or Bootstraps adaptive tags but I would prefer a "resolution switcher" button similar to what I see on various other sites showing "240, 480, 720, 1080" Is this possible to do automatically within the HTML5 video tag similar to the "CC Closed Captioning" button that appears when you add subtitle files ?

  I was trying to avoid using a custom player.

  This was my quick bootstrap solution but would prefer a button/switcher.

  <div class="hidden-xs">
  
      <video style="width:100%" autobuffer="autobuffer" controls="controls" poster="&lt;%= @video.attachment.url(:preview) %>"><source label="720" type="video/mp4" default="default"><source label="ogg" type="video/ogg"><source label="webm" type="video/webm"><track label="English" kind="subtitles" srclang="en" src="/assets/subtitles.vtt" default="default"><p>Your Browser does not support the video tag.</p></track></source></source></source></video>
  
  </div>
  
  <div class="visible-xs">
  
      <video style="width:100%" autobuffer="autobuffer" controls="controls" poster="&lt;%= @video.attachment.url(:preview) %>"><source label="360" type="video/mp4" default="default"><source label="ogg mobile" type="video/ogg"><source label="webm mobile" type="video/webm"><track label="English" kind="subtitles" srclang="en" src="/assets/subtitles.vtt" default="default"><p>Your Browser does not support the video tag.</p></track></source></source></source></video>
  
  </div>

• AVFormatContext with alsa,v4l2 to output AVFormatContext

  8 mars 2017, par GeneralN00bs

  Read first : I’m a new guy with Stack Overflow, and poor English, so please excuse my English, which is really bad.

  I’m trying to do web streaming with open input device ; audio, video devices to HTML5 video.

  for example, this project using ffmpeg command to like this :

  ffmpeg -f v4l2 -i <video devices="devices"> -f alsa -i <audio devices="devices"> -f mpegts -codec:v mpeg1video -b:v 800k -framerate 24 -codec:a mp2 -b:a 128k http://localhost:8082/secret
  
  </audio></video>

  Here’s the main question : I can open 2 avformatcontext with C language like this :

   AVFormatContext* get_ctx(const char* dev,const char* driver,AVDictionary *options)
  
   {
  
        AVFormatContext *ictx = avformat_alloc_context();
  
        AVInputFormat *fmt = NULL;
  
  
  
        //get input format.
  
        fmt = av_find_input_format(driver);
  
        //if have options
  
        if(options){
  
            //open device with options
  
            if(avformat_open_input(&ictx,dev,fmt,&options)<0){
  
                printf("get device with options failed.\n");
  
                return NULL;
  
            }
  
            //find stream info.
  
            if(avformat_find_stream_info(ictx,&options)<0){
  
                printf("get stream info with options failed.\n");
  
                return NULL;
  
            }
  
        //not have options.
  
        }else{
  
            if(avformat_open_input(&ictx,dev,fmt,NULL)<0){
  
                printf("get device failed.\n");
  
                return NULL;
  
            }
  
            if(avformat_find_stream_info(ictx,NULL)<0){
  
                printf("get stream info failed.\n");
  
                return NULL;
  
            }
  
        }
  
        av_dump_format(ictx,0,adev,0);
  
        return ictx;
  
    }

  Well, get v4l2 and alsa devices successfully using function above. but
  I can’t figure it out (2 input avformatcontext) to output avformatcontext.
  Any idea how can I am muxing 2 avformatcontext to output avformatcontext ?

• Ignore Connection Error on Multiple Rtsp Stream in FFmpeg

  17 décembre 2022, par Onur Külekci

  Sorry for my bad English. My problem is ;
ffmpeg command closes completely when one of the streams cannot be reached while multicasting. when it can't reach a single rtsp address, how can it ignore it and continue broadcasting from the others ?

  


  Example ;

  


  ffmpeg -i rtsp://5.63.151.4:443/atv/atv2 -map 0 c:\atv.flv -i rtsp://live.sabah.com.tr:443/ahaber/ahaber3 -map 1 c:\ahaber.flv


  


  if it can't reach the 2nd link, keep playing the first one

  


  Thank you !