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• FFmpeg - Rotating at angle

  23 septembre 2017, par connor

  I’ve been working through FFmpeg, but I have been unable to get a rotation to run from the examples they have on their site. I am trying to "wiggle" a video back and forth at a fixed point on the bottom - think a head moving left to right (and so on).

  I am attempting to do this with the filter "rotate" (https://ffmpeg.org/ffmpeg-filters.html#rotate). Attempting to use their examples, I get an error.

  This is what I have so far :

  ffmpeg -i vid1.mp4 -i vid2.mov -loop 1 -i image.png -filter_complex "\
  
      [2:v]alphaextract, scale=240x160[mask];\
  
      [0:v] scale=240x160, rotate=A*sin(2*PI/T*t) [ascaled];\
  
      [ascaled][mask]alphamerge[masked];\
  
      [1:v]scale=480x360[background];\
  
      [background][masked]overlay=120:20"\
  
      -c:a copy 65B6354F61B4AF02_HD_sq.MOV

  I am using "rotate" directly from an example in an attempt to get something to run at all.

  The error I get back is :

  [Parsed_rotate_3 @ 0x7ff4476045e0] [Eval @ 0x7fff5b3e3f00] Undefined constant or missing '(' in 'T*t)'
  
  [Parsed_rotate_3 @ 0x7ff4476045e0] Error occurred parsing angle expression 'A*sin(2*PI/T*t)'
  
  [Parsed_rotate_3 @ 0x7ff4476045e0] Failed to configure output pad on Parsed_rotate_3
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #1:0

  If I remove ’A’, ’T’, ’sin’, etc, rotate does actually work, but far from the desired behavior.

  Am I missing something to expose those params ?

• Transcoding video server. FFMPEG. Queues

  2 janvier 2018, par kostia7alania

  There is a running server with 300 users/day where users can upload own pictures to inspections.
  Now need to add video share service with sharing pictures.

  Now we use :
  1) IIS 10 (yes, WINDOWS server !) ;
  2) MS SQL 2017 ;
  3) PHP 7.0.
  and : asp.net,xlt 1,C#.

  It is desirable that we use the technologies we already use.

  Now I buy one new server and want to use it for transcoding and streaming.

  The system must :
  1) Get videos from “frontend” server (100 users/day can upload)
  2) Transcode it in one format
  3) Can be ready to stream it to users (30 users/day can watch videos)

  See my little review about possible solutions —>> https://vk.com/topic-125614288_363361445

  IMAGE => Video uploading, transcoding and keeping system

  p.s. I found FFMPEG, but don’t know how it works in parallel mode.
  Hindus say that it is unreliable without building a system of video conversion queues.

  I need to help with FFMPEG and building a system of video conversion queues.

  UPD : HERE IS MY EXAMPLE CODE :

      
  
  
  
      
  
          
  
          
  
          <?php require ('dbconn.php');?>
  
      
  
          <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/js/jquery.js' type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
          
  &lt;script src='http://stackoverflow.com/feeds/tag/js/bootstrap.js' type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
  
          
  
              
  
          
  
          
  
                  
  
                      < ?php
                          if(isset($_FILES[’file’]))
                                  $name = $_FILES[’file’][’name’] ;
                                  $extension = explode(’.’, $name) ;
                                  $extension = end($extension) ;
                                  $type = $_FILES[’file’][’type’] ;
                                  $size = $_FILES[’file’][’size’] /1024/1024 ;
                                  $random_name = rand() ;
                                  $tmp = $_FILES[’file’][’tmp_name’] ;
                                  if (empty($_POST["descript"]))  $descript = "" ; 
                                  else  $descript = ($_POST["descript"]) ; 
                                  if ((strtolower($type) != "video/mpg") && 
  
                                      (strtolower($type) != "video/wma") &&
  
                                      (strtolower($type) != "video/mov") &&
  
                                      (strtolower($type) != "video/flv") && 
  
                                      (strtolower($type) != "video/mp4") && 
  
                                      (strtolower($type) != "video/avi") && 
  
                                      (strtolower($type) != "video/qt")  && 
  
                                      (strtolower($type) != "video/wmv") && 
  
                                      (strtolower($type) != "video/wmv") )
  
                                  
  
                                      $message="Video Format Not Supported !" ;
  
                                   else 
  
                                      $message="Video uploaded successively !" ;
  
                                      move_uploaded_file($tmp, ’./upload/’.$random_name.’.’.$extension) ;  
  
                                      //$conn->query("INSERT INTO [dbo].[videos] VALUES(’$name’,’$random_name.$extension’,’descript !’)") ;
  
                                  $SQL2 = "INSERT INTO [dbo].[videos] VALUES(’$name’,’$random_name.$extension’,’$descript’)" ;
  
                                  $RES2 = @odbc_exec( $DB, $SQL2 ) ;
   ?>
  
                                  < ?php
  
                                  echo "&lt;script type='text/javascript'&gt;alert('$descript\\n\\n$message\\n\\nUpload: $name\\nSize: $size\\nType: $type\\nStored in: uploads/$name');&lt;/script&gt;" ;
  
   ?>
                                  < ?php
  
                              
  
                          
   ?>
   Select a Video : 
                      
  
  
                      
  
                      &nbsp ;&nbsp ;&nbsp ;&nbsp ;
  
                      
  button_SEND
                      
  
  List of Videos :
  
                              < ?php
                                  //$query = $conn->query("SELECT * FROM videos") ;
                                  $SQL = "SELECT * FROM [dbo].[videos]" ;
                                  $RES = @odbc_exec( $DB, $SQL ) ;
                                  //while($row = $RES->fetch())
                                  while($row = odbc_fetch_array($RES))
                                  $video_id = $row[’video_id’] ;
   ?>
                                  Click to Watch ---> 
  
                                      
  
                                          < ?php
  
                                              echo $row[’title’] ;
  
   ?>
  
                                       
  
                                  
  
                              < ?php include (’video_modal.php’) ; ?>
  
                              < ?php
  
                               
  
   ?>
  
          
  
          
  
  

  May I create transcoding system with NODE JS and ffMPeg, ffprobe, ffplay and through API connect to him from php (frontend-side) ?

• hls fails to play m3u8 playlist with videojs

  9 novembre 2020, par charlie

  I created an hls stream from yuv frames with ffmpeg which appears to work just fine. It creates a playlist and updates that, and all .ts files as expected. However even videojs refuses to play it, and I really run out of ideas, probably missing the obvious ?

  


  First, the m3u8 list which is continuously updated :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:190
#EXTINF:2.000000,
test190.ts
#EXTINF:2.000000,
test191.ts
#EXTINF:2.000000,
test192.ts
#EXTINF:2.000000,
test193.ts
#EXTINF:2.000000,
test194.ts


  


  Those .ts files exist and have sizes of approx 250 kBytes.
Then, I open this standard videojs html file (residing in the same directory) :

  


  &#xA;&#xA;&#xA;&#xA;&#xA;&#xA;  &#xA;&#xA;&#xA;  <h1>VSTream</h1>&#xA;&#xA;  &#xA;    <source src="test.m3u8" type="application/x-mpegURL">&#xA;  &#xA;  &#xA;  <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/video.min.js'&gt;&lt;/script&gt;&#xA;  &lt;script src='http://stackoverflow.com/feeds/tag/videojs-http-streaming.min.js'&gt;&lt;/script&gt;&#xA;  &#xA;  &lt;script&gt;&amp;#xA;    var player = videojs(&amp;#x27;my_video_1&amp;#x27;);&amp;#xA;  &lt;/script&gt;&#xA;  &#xA;&#xA;&#xA;

  


  I open this in Firefox (or Chrome, or Edge, none works) and use its debugger which in the console shows :

  


  


  VIDEOJS : WARN : A plugin named "reloadSourceOnError" already exists.
You may want to avoid re-registering plugins ! video.min.js:12:977
Specified “type” attribute of “application/x-mpegURL” is not
supported. Load of media resource test.m3u8 failed. vstream.html All
candidate resources failed to load. Media load paused. vstream.html
XML Parsing Error : syntax error Location : file :///C :/test/test.m3u8
Line Number 1, Column 1 : 2 test.m3u8:1:1 MouseEvent.mozPressure is
deprecated. Use PointerEvent.pressure instead. video.min.js:12:9031
VIDEOJS : ERROR : (CODE:3 MEDIA_ERR_DECODE) Playback cannot continue. No
available working or supported playlists. Object code : 3, message :
"Playback cannot continue. No available working or supported
playlists." video.min.js:12:977

  


  


  This doesn't make much sense to me. Why would it throw an XML parsing error for an m3u8 file ? Of course, the MEDIA_ERR_DECODE points in some direction, but the same problem persists with fMP4 files.

  


  The relevant ffmpeg c++ code (format is "hls" and formatContext works well in other scenarios, gop is 2) :

  


      AVDictionary* options = 0;
    if (fragmented)
    {
        // type
        if (codecID == AV_CODEC_ID_H264)
            av_dict_set (&options, "hls_segment_type", "fmp4", 0);
        else
            av_dict_set (&options, "hls_segment_type", "mpegts", 0);

        av_dict_set (&options, "hls_time", "2.0", 0);
        av_dict_set_int (&options, "hls_list_size", 5, 0);
        av_dict_set (&options, "hls_flags", "delete_segments", 0);
    }

    int ret = avformat_write_header (formatContext, &options);


  


  ...which returns success. Then writing frames

  


      int ret = avcodec_send_frame (videoStream->codecContext, frame);
    av_init_packet (avPacket);
    AVRational timeBase = videoStream->getTimeBase ();
    avPacket->stream_index = streams.indexOf (videoStream);
    ret = avcodec_receive_packet (videoStream->codecContext, avPacket);
    avPacket->duration = av_rescale_q (1, videoStream->codecContext->time_base, videoStream->getTimeBase ());
    pts += avPacket->duration;
    avPacket->pts = pts;
    avPacket->dts = pts;    //  AV_NOPTS_VALUE;
    ret = av_interleaved_write_frame (formatContext, avPacket);


  


  (videoStream here is an internal object representing the avstream).
I've omitted error checks for clarity. All return values show success.
Thanks for any help on this !