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• ffmpeg transcoding reset the start time of file

  12 août 2013, par diousk

  I use a segmenter to segment my MPEG 2 Ts file into a series of media segment for HTTP live streaming

  and each segment's start time following the previous one
  (ex:start time of segments : 00:00,00:10,00:20,00:30,...)

  (In Ubuntu)

  The Question is :

  When I use ffmpeg to transcode one of the media segment (ex 800k bps to 200k bps)

  the start time of transcoded media segment will be reset to 0

  ex:As I transcode the third segement,

  start time of segments changing to : 00:00,00:10,00:00,00:30,...

  It cause my player freezing once play the transcoded media segment

  Is there any solution to transcode media file with the same start time ?

  I guess it's the ffmpeg reset the PTS(presentation timestamp) of segment

  But I don't know how to fix it...

  here is my ffmpeg command (transcode to 250k bps)

  ============================

  ffmpeg -y -i sample-03.ts -f mpegts -acodec libfaac -ar 48000 -ab 64k -vcodec libx264 -b 250k -flags +loop -cmp +chroma \
  
   -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 0 -refs 0 -coder 0 -me_range 16 -keyint_min 25 \
  
   -sc_threshold 40 -i_qfactor 0.71 -maxrate 250k -bufsize 250k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 \
  
   -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 320:240 -g 30 -async 2 sample.ts

  ============================

  Help !

  thanks

• RTMP flv always start at 0

  8 novembre 2022, par DNS

  I'm using ffmpeg to send audio :

  


  const args = [
    '-re',
    '-i',
    '-',
    '-vcodec', 'copy',
    '-acodec', 'aac',
    '-f', 'flv',
    'http://localhost:4001/live/test'
];


  


  I have one issue with the stream, it always starts from the very beginning so if someone joins the stream after 10 minutes, he will have 10 minutes latency.

  


  The RTMP stream is in FLV format, is there anything to add to setup where the streams comes from ?

  


  I tried to check the headers of flv. I tried to change ffmpeg parameters.

  


  I would like to start the stream with VLC at specific position (about 3 seconds latency)...

  


• FFMPEG delaying the start of video when using between

  11 décembre 2019, par Michael Joseph Aubry

  ffmpeg -i "in.mp4" -i "./watermark.png" -f lavfi -i color=c=white:s=1080x1920 -filter_complex " [0:v]scale=2560:1440[ovr1], [1:v]scale=458:58[ovr2], [2:v][ovr1]overlay=-740:240:enable='between(t,2,7)'[int1], [int1][ovr2]overlay=W-500:H-100:enable='between(t,0,15)' [main] " -map "[main]" -ac 2 -vcodec libx264 -preset veryfast -crf 27 -vb 20M -t 00:00:15 out.mp4

  This command takes my second input (watermark) it overlays it on my first input (video). It also scales both of them accordingly. It also sets the times to appear and disappear throughout the video.

  The problem is [2:v][ovr1]overlay=-740:240:enable='between(t,2,7)'[int1] when I set my video input to appear between 2 seconds and 7 seconds. The result is as such, however, when it appears at the 2-second mark, the video is also starting at the 2-second mark when the video should start at its own 0-second mark within the new video.

  How can I adjust the ffmpeg command above to start the video input at 2 seconds within the video but have it start at the input video’s 0-second mark ?