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• Why isn't the 'wrap' option recognized in FFmpeg's drawtext filter ?

  24 février 2023, par eugene_prg

  I'm trying to add text to a video using FFmpeg's drawtext filter, but I'm running into an issue with the 'wrap' option. Whenever I include 'wrap=500' in the filtergraph, I get the following error message :

  


  [Parsed_drawtext_1 @ 0x563e23b1f500] Option 'wrap' not found
[AVFilterGraph @ 0x563e23b18d00] Error initializing filter 'drawtext' with args 'enable=between(t,0,4):text=one day you wake up and...:x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500'
Error reinitializing filters !
Failed to inject frame into filter network : Option not found
Error while processing the decoded data for stream #0:0

  


  Here's the full command I'm using :

  


  ffmpeg -y -i "./videos/pexels-ivan-samkov-6689156.mp4" -vf "drawtext=fontfile=./fonts/DejaVuSans.ttf:text='DID U KNOW':x=(w-text_w)/2:y=200:fontsize=72:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=10, drawtext='enable=between(t,0,4)':text='do you know that girls...':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500, drawtext='enable=between(t,4,8)':text='are smarter than guys?':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5" -c:a copy "pexels-ivan-samkov-6689156.mp4_with_labels.mp4"


  


  I'm not sure why the 'wrap' option isn't recognized. Can anyone help me figure out what's going on ?

  


• Why opening multiple ffmpeg.exe causes IIS stuck ?

  24 mars 2023, par Wen

  I've been working on this project for several months, trying to convert RTSP streams to JPEG images and send them back to the client. I'm using C# ProcessStartInfo and multipart/x-mixed-replace to achieve this goal. It worked well for only one camera. Unfortunately, I found that the IIS would deadlock after opening too many RTSP streams or maybe ffmepg.exe. After that, I must restart IIS, or the program cannot execute. I've been searching for the answer for more than three weeks. Here is part of my code :

  


  public HttpResponseMessage GetVideo(int id){
      HttpResponseMessage response = Request.CreateResponse();
      var pushStreamContent = new PushStreamContent((stream, content, context) =>{
          this.stream = stream;
          FrameReader();
       });

       pushStreamContent.Headers.ContentType =      
       **System.Net.Http.Headers.MediaTypeHeaderValue.Parse("multipart/x-mixed-replace");**
       response.Content = pushStreamContent;
       return response;
   }



public async Task FrameReader(){
     ProcessStartInfo startInfo = new ProcessStartInfo{
                      StandardErrorEncoding = Encoding.UTF8,
                      FileName = ffmpegPath,
                      **Arguments = $"-rtsp_transport tcp -timeout 1000000 -i {rtsp_url} -f image2pipe -"**,
                      UseShellExecute = false,
                      CreateNoWindow = true
     };

using (var ffmpegProcess = new Process { StartInfo = startInfo }){
                    ffmpegProcess.Start();
                    ffmpegProcess.BeginErrorReadLine();

  //Here is a portion related to image processing
 }

}


  


  Really need some advices, thank you in advance !!!

  


• FFMPEG Layering two .mov files color issue

  21 février 2023, par JDC

  I have two folders containing numbered .mov files all the same length, one folder for front and one for back. I'm using ffmpeg to combine the front and back videos with matching numbers into one output video (the front video has an alpha channel). The below command works, but in the output video the front layer has slightly incorrect colors compared to the input (reds are too yellow for example). The back layer in the output looks correct. Both input files use the bt709 color space (checked with ffprobe). Is there something in the overlay options which is causing the front layer to look incorrect, or something I'm doing wrong with the colorspace options ?

  


  


  for f in Video_Back/Video_Back_*.mov ; do
num=$(echo "$f" | sed -n 's/.*Video_Back_([0-9]5).mov$/\1/p')
if [ -f "Video_Front/Video_Front_$num.mov" ] ; then
ffmpeg -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "$f" -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "Video_Front/Video_Front_$num.mov" -filter_complex "[1:v]format=rgba[fg] ;[0:v][fg]overlay=shortest=1:alpha=straight,eq=gamma=1.0[mixed]" -map "[mixed]" -map 0:a:0 -c:v libx264 -crf 18 -preset veryfast -c:a copy "Video_Merged/Video_Merged_$num.mp4"
fi
done