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Sur d’autres sites (8727)

  • Capturing stream that has multiple frames

    28 mai 2021, par cheese5505

    I'm trying to capture a stream that has multiple "frames" (not sure that's what you would call it but it has multiple 5 second streams inside of it) with FFmpeg and saving to file. When I put it into Quicktime player and play it works fine, however when I put it into FFmpeg and review the final file it seems that the audio and video are out of sync and the video frequently stops. I think this may be because it is stopping to switch to the new 5 second video but i'm not sure. This is the command I am using :

    



    ffmpeg \
    -v 9 \
    -loglevel 99 \
    -y \
    -re \
    -hwaccel auto \
    -threads 4 \
    -user-agent "Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16" \
    -i "url here" \
    -ac 2 \
    -strict -2 \
    -c:a aac \
    test.mov


    



    In the FFmpeg log this frequently happens :

    



    frame=  242 fps=102 q=29.0 size=     252kB time=00:00:06.33 bitrate= 325.9kbits/
frame=  279 fps= 96 q=29.0 size=     252kB time=00:00:07.57 bitrate= 272.8kbits/
frame=  301 fps= 87 q=29.0 size=     252kB time=00:00:08.30 bitrate= 248.7kbits/
frame=  319 fps= 79 q=29.0 size=     252kB time=00:00:08.90 bitrate= 231.9kbits/
frame=  338 fps= 74 q=29.0 size=     252kB time=00:00:09.54 bitrate= 216.5kbits/
frame=  354 fps= 70 q=29.0 size=     252kB time=00:00:10.07 bitrate= 205.0kbits/
skipping 5 segments ahead, expired from playlists
[https @ 0x7f9d81e10380] No trailing CRLF found in HTTP header.
frame=  355 fps= 51 q=29.0 size=     252kB time=00:00:10.11 bitrate= 204.3kbits/
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 6
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 7
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 8
skipping 3 segments ahead, expired from playlists
[https @ 0x7f9d81f006a0] No trailing CRLF found in HTTP header.


    



    Any ideas how I could smooth out the final file would be greatly appreciated.

    


  • How to reduce the app size after use of FFMPEG in flutter ?

    10 octobre 2022, par Sugan Pandurengan

    I'm current using ffmpeg_kit_flutter 4.5.1-LTS after that my app bundle size increase by 150mb and final bundle size is 250 mb.

    


    Is there any way to reduce the app bundle size with FFMPEG.

    


  • Stop JavaVC playback warning

    5 novembre 2017, par Chaoslab

    Receiving a stream of command line warnings as video plays - deprecated pixel format used, make sure you did set range correctly

    Question :
    How can I stop the warnings from happening or being displayed ?

    Example code below (just frame grabbing, not timed playback).

    import java.io.File;
    

    
import org.bytedeco.javacv.CanvasFrame;
    
import org.bytedeco.javacv.FFmpegFrameGrabber;
    
import org.bytedeco.javacv.Frame;
    

    
public class TestPlay implements Runnable {
    
 private static String      video_loc = null;
    
 private static CanvasFrame canvas    = new CanvasFrame("Test JavaCV player");
    

    
 public static void main(String[] args) { new Thread(new TestPlay(args[0])).start(); }
    

    
 public void run() { play_video(video_loc); }
    

    
 public TestPlay(String loc) { video_loc = loc; }
    

    
 public static final void play_video(String vid_loc) {
    
  try {
    
   File               file      = new File(vid_loc);
    
   FFmpegFrameGrabber ffmpeg_fg = new FFmpegFrameGrabber(file.getAbsolutePath());
    
   Frame              frm;
    
   ffmpeg_fg.setAudioChannels(0);
    
   ffmpeg_fg.start();
    
   for(;;)
    
    if((frm = ffmpeg_fg.grab()) != null) canvas.showImage(frm);
    
    else {
    
     ffmpeg_fg.setTimestamp(0);
    
     break;
    
    }
    
   ffmpeg_fg.stop();
    
  } catch(Exception ex) { ex("play_video vid_loc:" + vid_loc, ex); }
    
 }
    

    
 public static final void ex(String txt, Exception ex)   {
    
  System.out.println("EXCEPTION: " + txt + " stack..."); ex.printStackTrace(System.out); }
    
}

    Looking into these possible solutions...

    • Set the correct pixel format before decoding.
    • Turning off FFMpeg warning logging.

    Will update with a fix when found.

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