Recherche avancée

Sur d’autres sites (7322)

• On upload rename the file to input.mp4 not working

  7 septembre 2014, par T.A.R.D.I.S_wolf

  Ok so i’m trying to make it to were the file is uploaded then renamed to input.mp4 so that it over rights the old one. But its not working ?

  But it still keeps uploading with the original file name.
  Or is there a way to just delete the files in the folder uploads after 30 min ? Both the uploaded file and output file.

  <?php
  
  $fileName = $_FILES["file1"]["name"]; // The file name
  
  $fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder
  
  $fileType = $_FILES["file1"]["type"]; // The type of file it is
  
  $fileSize = $_FILES["file1"]["size"]; // File size in bytes
  
  $fileErrorMsg = $_FILES["file1"]["error"]; // 0 for false... and 1 for true
  
  if (!$fileTmpLoc) { // if file not chosen
  
      echo "ERROR: Please browse for a file before clicking the upload button.";
  
      exit();
  
  }
  
  
  
      $newfilename = $fileName . input.mp4';
  
      rename($fileName, $newfilename);
  
  
  
  if(move_uploaded_file($fileTmpLoc, "uploads/$newfilename")){
  
  
  
    echo "Starting ffmpeg... <br />";
  
    echo shell_exec("ffmpeg -y -i uploads/".$newfilename." uploads/output.mp3");
  
    echo "Done. <br /><br />";
  
  
  
  echo '<a href="http://test.tw-wcs.com:82/ffmpeg/MP4_To_MP3/uploads/output.mp3" target="_blank">Click Here</a> To open your file in a new tab.';
  
  
  
  } else {
  
      echo "move_uploaded_file function failed";
  
  }
  
  ?>

• Concatenate multiple video files alongside delayed audio files

  28 mars 2022, par Spartan 117

  I am currently working on a utility that is responsible for pulling audio and video files from the cloud and merging them together via FFMPEG. As I am new to FFMPEG, I am going to split the question into an FFMPEG part and a C# part just so people can answer either 1 part or the other (or both !).

  


  FFMPEG Part

  


  Currently, I have a working FFMPEG arg if there is only 1 video file present and it needs to be merged with multiple files.

  


  ffmpeg -i input1.mkv -i input1.mka -i input2.mka -i input3.mka -i input4.mka -filter_complex "[1:a]adelay=0s:all=1[a1pad];[2:a]adelay=20s:all=1[a2pad];[3:a]adelay=30s:all=1[a3pad];[4:a]adelay=40s:all=1[a4pad];[a1pad][a2pad][a3pad][a4pad]amix=inputs=4:weights=1|1|1|1[aout]" -map [aout] -map 0:0 output4.mkv


  


  The delays you see in there are determined by subtracting the start time of each file from the start time of the earliest created audio or video file. I know that if I wanted to create a horizontal stack of multiple videos, i could just do

  


  ffmpeg -i input1.mkv -i input1.mka -i input2.mkv -i input2.mka -i input3.mka -i input4.mka
-filter_complex 
"[2:v]tpad=start_duration=120:color=black[vpad]; 
 [3:a]adelay=120000:all=1[a2pad]; 
 [4:a]adelay=180000:all=1[a3pad];
 [5:a]adelay=200000:all=1[a4pad]; 
 [0:v][vpad]hstack=inputs=2[vout]; 
 [1:a][a2pad][a3pad][a4pad]amix=inputs=4:weights=1|1|1|1[aout]" 
 -map [vout] -map [aout] 
 output.mkv


  


  but what I want to do is both keep those delays for the audio and video files AND concatenate (not stack) those videos, how would i go about doing that ?

  


  C# Part

  


  You see that giant arg up there ? The utility is supposed to generate that based on a List of recordings. Here is the model.

  


  List<filemodel> _records;&#xA;public class FileModel {&#xA;  public string Id { get; set; }&#xA;  public string FileType { get; set; }&#xA;  public string StartTime { get; set; }&#xA;}&#xA;</filemodel>

  


  The utility has to then go through that list and create the arg (as seen in the FFMPEG part) to be executed by the Xabe.FFMPEG package. The way i was thinking to approach this is to basically create 2 string builders. 1 string builder will be responsible for dealing with the inputs, the other string builder. Here is what i have so far

  


  private async Task CombineAsync()
    {
        var minTime = _records.Min(y => Convert.ToDateTime(y.StartTime));
        var frontBuilder = new StringBuilder("-y ");
        var middleBuilder = new StringBuilder("-filter_complex \"");
        var endString = $" -map [vout] -map [aout] {_folderPath}\\CombinedOutput.mkv";

        for (var i = 0; i < _records.Count; i++)
        {
            var type = _records[i].FileType.ToLower();
            var delay = (Convert.ToDateTime(_records[i].StartTime).Subtract(minTime)).TotalSeconds;
            frontBuilder.Append($"-i {_folderPath + "\\" + _records[i].Id} ");
            var addColon = i != _records.Count - 1 ? ";" : "";
            middleBuilder.Append(type.Equals("video") ? $"[{i}:v]tpad=start_duration={delay}:color=black[v{i}pad]{addColon} " : $"[{i}:a]adelay={delay}s:all=1[a{i}pad]{addColon} ");
        }
        middleBuilder.Append("\"");
        Console.WriteLine(frontBuilder.ToString() + middleBuilder.ToString() + endString);
        // var args = frontBuilder + middleBuilder + endString;
        // try
        // {
        //     var conversionResult = await FFmpeg.Conversions.New().Start(args);
        //     Console.WriteLine(JsonConvert.SerializeObject(conversionResult));
        // }
        // catch (Exception e)
        // {
        //     Console.WriteLine(e);
        // }
    }


  


  


  1. Is this the correct way to go about building the argument out ?

     


  


  2. How in god's name do i get something like this in there, since it relies on naming and total count for the piping and inputs=

     


       [0:v][vpad]hstack=inputs=2[vout]; // This part will change for video concatenation depending on what gets answered above
  [1:a][a2pad][a3pad][a4pad]amix=inputs=4:weights=1|1|1|1[aout]


     


  


  


• Understanding PTS and DTS in video frames

  8 août 2015, par theateist

  I had fps issues when transcoding from avi to mp4(x264). Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function :

  1.  AVFormatContext* outContainer = NULL;
  
  2.  avformat_alloc_output_context2(&outContainer, NULL, "mp4", "c:\\test.mp4";
  
  3.  AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  4.  AVStream *outStream = avformat_new_stream(outContainer, encoder);
  
  5.  // outStream->codec initiation
  
  6.  // ...
  
  7.  avformat_write_header(outContainer, NULL);
  
  
  
  8.  // reading and decoding packet
  
  9.  // ...
  
  10. avcodec_encode_video2(outStream->codec, &encodedPacket, decodedFrame, &got_frame)
  
  11. 
  
  12. if (encodedPacket.pts != AV_NOPTS_VALUE)
  
  13.     encodedPacket.pts =  av_rescale_q(encodedPacket.pts, outStream->codec->time_base, outStream->time_base);
  
  14. if (encodedPacket.dts != AV_NOPTS_VALUE)
  
  15.     encodedPacket.dts = av_rescale_q(encodedPacket.dts, outStream->codec->time_base, outStream->time_base);
  
  16. 
  
  17. av_interleaved_write_frame(outContainer, &encodedPacket)

  After reading many posts I still do not understand :

  1. outStream->codec->time_base = 1/25 and outStream->time_base = 1/12800. The 1st one was set by me but I cannot figure out why and who set 12800 ? I noticed that before line (7) outStream->time_base = 1/90000 and right after it it changes to 1/12800, why ?
     When I transcode from avi to avi, meaning changing the line (2) to avformat_alloc_output_context2(&outContainer, NULL, "avi", "c:\\test.avi"; , so before and after line (7) outStream->time_base remains always 1/25 and not like in mp4 case, why ?
  2. What is the difference between time_base of outStream->codec and outStream ?
  3. To calc the pts av_rescale_q does : takes 2 time_base, multiplies their fractions in cross and then compute the pts. Why it does this in this way ? As I debugged, the encodedPacket.pts has value incremental by 1, so why changing it if it does has value ?
  4. At the beginning the dts value is -2 and after each rescaling it still has negative number, but despite this the video played correctly ! Shouldn’t it be positive ?