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• FFMPEG Webvtt m3u8 download into single vtt file, ignore the "X-TIMESTAMP-MAP=MPEGTS=" (timestamp sync problem)

  5 janvier 2021, par Panda Xia

  I want to download the subtitle of a video, it has separated m3u8 file for subtitle :

  


  webvtt source in m3u8 format : https://sdn-global-streaming-cache.3qsdn.com/9378/files/19/05/1199332/Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes.ism/Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000.m3u8

  


  looks like :

  


  #EXTM3U
#EXT-X-VERSION:4
## Created with Unified Streaming Platform(version=1.9.5)
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:989
#USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
#EXTINF:24.72, no desc
Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000-1.webvtt
#EXTINF:2.56, no desc
Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000-13.webvtt
#EXTINF:50.88, no desc
Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000-14.webvtt
#EXTINF:3.079, no desc
Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000-40.webvtt
#EXTINF:60.401, no desc
....


  


  Then use the command to download the multiple webvtts into one vtt file "EN.vtt" :

  


  ffmpeg -i  "https://sdn-global-streaming-cache.3qsdn.com/9378/files/19/05/1199332/Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes.ism/Dqt6jZBkvX2nLyY4CGhxmpK89PbQRFV7-drm-aes-textstream_deu=1000.m3u8"  "DE.vtt"


  


  In output "DE.vtt" the X-TIMESTAMP-MAP=MPEGTS:xxxxxx,LOCAL:00:00:00.000 from each webvtt file (webvtt in m3u8) are ignored.

  


  so that the time Synchronisation is broken, the start time of each Segment always begins from 00:00:00, looks like :

  


  WEBVTT

00:00.000 --> 00:02.560
So viel Macht.

00:00.000 --> 00:03.079
Was er sagte.

00:00.000 --> 00:04.680
oder
die Schönheit

00:00.000 --> 00:01.440
Er sagte immer:

00:00.000 --> 00:03.840
Auf seinen Klang 

00:00.000 --> 00:07.519
Seine Paranoia.


  


  Could ffmpeg support the relative time stamp to convert into absolute time stamp ?
Or use other method to download perfect webvvt file ?

  


• Place two videos side by side using ffmpeg ?and download it as one file

  5 août 2019, par marceloo1223

  I have two video files, which I want to play side by side and download them later. I used FFMPEG to merge them as one :

  protected void combinetwovideo()
  
  {
  
      string strParam;
  
      string Path_FFMPEG = Path.Combine(HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["FFMpegPath"]));
  
      string apppath=HttpRuntime.AppDomainAppPath;
  
      //Merging two videos               
  
      String video1=apppath+"\\recordings\\client2019-08-03 02_23_59";
  
      String video2 =apppath+"\\userrecord\\User2019-08-03 02_24_00";
  
      String strResult =apppath+"\\RESULT\\";
  
      strParam = string.Format("-i ('" + video1 + "') -i ('" + video2 + "') -filter_complex \'[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' /-map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4");
  
      process(Path_FFMPEG, strParam);
  
  }

   public void process(string Path_FFMPEG, string strParam)
  
   {
  
      try
  
      {
  
          Process ffmpeg = new Process();
  
          ProcessStartInfo ffmpeg_StartInfo = new ProcessStartInfo(Path_FFMPEG, strParam);
  
          ffmpeg_StartInfo.UseShellExecute = false;
  
          ffmpeg_StartInfo.RedirectStandardError = true;
  
          ffmpeg_StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo = ffmpeg_StartInfo;
  
          ffmpeg_StartInfo.CreateNoWindow = true;
  
          ffmpeg.EnableRaisingEvents = true;
  
          ffmpeg.Start();
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
          ffmpeg.Dispose();
  
          ffmpeg = null;
  
      }
  
      catch (Exception ex)
  
      {
  
      }
  
  }

  But this method outputs nothing and does not throw any errors. I’m confused about the strParam query. Did I write it wrong or am I missing something. Any help would be apreciated.

• FFMPEG M3U8 Download Is Shortened When Processed

  19 décembre 2022, par Devin Dixon

  I am downloading an m3u8 stream with FFMPEG as such :

  


  timeout 60m ffmpeg -i [feed_url] -movflags isml+frag_keyframe+faststart -bsf:a aac_adtstoasc -vcodec copy -c copy [save_file].mp4


  


  

  • The timeout will automatically end the stream after 60. minutes

  


  • The -movflags isml+frag_keyframe+faststart makes sure the moov atom is present for partial downloads and if the stream is cut off.

  


  


  This works fine when I play it in Quicktime or Safari.The stream is then uploaded to another server and it gets processed with this ffmpeg command :

  


  ffmpeg  -i [input_file] -y  -f mp4 -pix_fmt yuv420p -c:v libx264 -c:a aac -filter_complex "scale='if(gt(iw,1920),1920,-1)':'if(gt(ih,1080),1080,-1)':force_original_aspect_ratio=decrease" -crf 20 -movflags faststart -max_muxing_queue_size 9999 -attempt_recovery 1 -max_recovery_attempts 3 -f mp4 [output_file]


  


  When the above command is run, sometimes this error occurs :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] Packet corrupt (stream = 0, dts = 53801910).=  64x     
[NULL @ 0xaaaafcd649b0] Invalid NAL unit size (1186 > 532).
[NULL @ 0xaaaafcd649b0] missing picture in access unit with size 542
/code/partners/tmp/video_634d29a2e1f6e.mp4: corrupt input packet in stream 0
[h264 @ 0xaaaafd1211f0] Invalid NAL unit size (1186 > 532).
[h264 @ 0xaaaafd1211f0] Error splitting the input into NAL units.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x3802b2: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x380791: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x380c38: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x380f8d: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x38137a: partial file
Error while decoding stream #0:0: Invalid data found when processing input
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaaaafcd63b70] stream 0, offset 0x381750: partial file
[mp4 @ 0xaaaafcd743d0] Starting second pass: moving the moov atom to the beginning of the file
frame= 8967 fps=923 q=-1.0 Lsize=    5683kB time=00:09:57.60 bitrate=  77.9kbits/s speed=61.5x    
video:5580kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.843884%


  


  When this error occurs, the video is cut short. If the full video is 60 minutes that error occurs at the 10 minute mark, the converted video will only be 10 minutes. What is that error and how can I get ffmpeg to stop cutting the output video short ?