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• FFMPEG + PHP capture still from live video ?

  28 décembre 2022, par Tyris Audronis

  I'm trying to capture a new frame every X seconds from a live video on a local webserver using PHP and save it as an image file. Obviously, we have the normal thumbnail generation of

  


  $ffmpeg -i $vidFile -an -ss $time -s $size $imageFilename.


  


  But that is only for video files. What would be the way of doing that using a live stream ?

  


  I don't even know where to start on a livestream to do this...I'm using LAMP on an ubuntu server for this.

  


• Live Stream Video using ffmpeg

  13 novembre 2019, par Mir Injamamul

  I am working with ffmpeg . i converted [something1].h264 file to [something1].m3u8 file. with this command

  ffmpeg -i /var/www/html/video1.h264 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -c:v copy -shortest -hls_list_size 0 -segment_list_flags +live /var/www/html/vid/out/video5.m3u8

  All i know the event type is VOD (video on demand) .

  1. I want make my converted file into live streaming format. So if anybody come to my link he will see from the moment he came , not from the beginning.
  2. how to make this live stream from chunk of video , suppose i have 2 video file , i want 2nd video will add in the live sream after the end of 1st video
     Any kind of help will be great

• Transcode from a live m3u8 using -ss

  20 août 2015, par pgm

  I’m trying to create a VOD hls clip from a live hls stream on adobe media server using ffmpeg and nodejs.

  An example of the command I’m using looks like this :

  ffmpeg -report -analyzeduration 999999999 -probesize 999999999 -ss 50 -i http://live.m3u8 -y -r 29.97 -threads 0 -hls_list_size 0 -c:v copy -a:v copy streamoutput.m3u8

  The problem is the -ss param (start time) is calculating the start time from the live point on the stream, rather than from the first ’ts’ fragment. I’d like to be able to encode inside of a "DVR window," meaning seeking from the beginning of the stream, not from the live point of the stream.

  Example : I use the param -ss 50 and it won’t encode for 50 seconds until the live stream catches up, outputting this in the ffmpeg log :

  [h264 @ 0000000002beae00] non-existing PPS 0 referenced
  
  [h264 @ 0000000002beae00] non-existing PPS 0 referenced
  
  [h264 @ 0000000002beae00] decode_slice_header error

  Once the live stream catches up to the 50 second delay it begins encoding. It works this way when I use -ss as either an input parameter or output parameter.

  Is there a way to accomplish this ? I’ve noticed that if I leave -ss completely out of the command, it will start at the beginning of the stream, but as soon as it’s there, even as a 0, it will start at the "live point."

  Any help is much appreciated !