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• How to make FFmpeg download only the required segments [closed]

  25 juillet, par daniil_

  I'm developing a tool, that create timelapse. For this purpose I use ffmpeg 7.1.1 verion.
I have a playlist file called index.m3u8 (inside it there are URLs to TS segments—typically around 5,000 of them). Here’s a small excerpt :

  


  #EXTM3U
#EXT-X-TARGETDURATION:12
#EXT-X-VERSION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:EVENT
#EXT-X-START:TIME-OFFSET=8,PRECISE=YES
#EXT-X-PROGRAM-DATE-TIME:2025-07-22T07:59:51.173Z
#EXTINF:10.080,
https://my-storage.io/receiver/archives/3a1b162d-392d-d45a-089a-dc93fb842a35/files/2025-07-22/07/59/1753171191173_aa_00000_00000_10080.ts?exp=1753543086&signature=MEYCIQCx_hDnFVwk7WJyQG5QujV5ZGhLoBqkD5uoQFebha1knQIhAMJm1KA5DLEuqD4_5zS5QlzTGIuj5q9TCUcML7MEPMl7
#EXT-X-PROGRAM-DATE-TIME:2025-07-22T08:00:01.253Z
#EXTINF:10.080,
https://my-storage.io/receiver/archives/3a1b162d-392d-d45a-089a-dc93fb842a35/files/2025-07-22/08/00/1753171201253_aa_00000_00000_10080.ts?exp=1753543086&signature=MEYCIQCx_hDnFVwk7WJyQG5QujV5ZGhLoBqkD5uoQFebha1knQIhAMJm1KA5DLEuqD4_5zS5QlzTGIuj5q9TCUcML7MEPMl7
#EXT-X-PROGRAM-DATE-TIME:2025-07-22T08:00:11.333Z
#EXTINF:10.021,
https://my-storage.io/receiver/archives/3a1b162d-392d-d45a-089a-dc93fb842a35/files/2025-07-22/08/00/1753171211333_aa_00000_00000_10021.ts?exp=1753543086&signature=MEYCIQCx_hDnFVwk7WJyQG5QujV5ZGhLoBqkD5uoQFebha1knQIhAMJm1KA5DLEuqD4_5zS5QlzTGIuj5q9TCUcML7MEPMl7
#EXT-X-PROGRAM-DATE-TIME:2025-07-22T08:00:21.354Z
#EXTINF:10.079,
https://my-storage.io/receiver/archives/3a1b162d-392d-d45a-089a-dc93fb842a35/files/2025-07-22/08/00/1753171221354_aa_00000_00000_10079.ts?exp=1753543086&signature=MEYCIQCx_hDnFVwk7WJyQG5QujV5ZGhLoBqkD5uoQFebha1knQIhAMJm1KA5DLEuqD4_5zS5QlzTGIuj5q9TCUcML7MEPMl7
#EXT-X-PROGRAM-DATE-TIME:2025-07-22T08:00:31.433Z
...


  


  I’m trying to extract still images from the stream at specific moments.

  


  When I run a command like :

  


  ffmpeg \
  -analyzeduration 5000000 \
  -probesize 5000000 \
  -err_detect ignore_err \
  -protocol_whitelist file,http,https,tcp,tls \
  -allowed_extensions ALL \
  -f hls \
  -y \
  -ss 11316.719 \
  -i /Users/daniil/Desktop/test/exports/.../index.m3u8 \
  -frames:v 1 \
  -q:v 2 \
  /Users/daniil/Desktop/test/exports/.../frames/frame_00100.png


  


  ffmpeg downloads segments 1 and 2 (presumably to probe the format), and then it downloads two more TS files around the target timestamp.

  


  But as soon as I push the -ss value beyond a certain point—in my case -ss 8487.54—it starts downloading every TS segment from the very start of the playlist up to the one I need. That can easily be 1,000 TS files or more. In other words, when -ss is between 0 and 8374.372, everything works fine, but beyond that it exhibits this strange behavior.

  


• RTSP to RTMP using FFMPEG on Raspberry Pi to YouTube Livestream ends prematurely (and sometimes doesn't start)

  12 mars 2021, par user203875

  I have been running a program from my raspberry pi 4 that converts a RTSP network camera feed to RTMP for YouTube. The stream used to run non-stop every day. I didn't have to do anything. I have a program in place that would restart if the feed died.

  


  Nothing has changed with that program in 2 years. About a month ago, the feed stopped working. I just started into trying to figure out why. Maybe someone has some ideas on what is going on ?

  


  In order for me to start the feed, I must also start a studio.youtube.com browser session showing the feed information. If that web page is up and running, the live stream will start. While I can't say for certain that it NEVER starts without this session running, it seems that way.

  


  Usually the stream lasts for an hour or two. Rarely more than four hours.

  


  When I start up a studio.youtube.com session after the stream dies the "Dimiss" or "Edit in Studio" message is on the page. I have to hit "dismiss" before I can start up the stream again.

  


  Is there a solution to this ?

  


  Again, my program didn't change, so I'm at a loss for what I can do to fix this.

  


• Get remote MKV file metadata using nodejs

  31 mars 2024, par Ali Rahmani

  I need to extract the softsubs embeded into an mkv file hosted on a remote server using nodejs.

  


  All of the solutions I've found online so far are using local files, and others are either poorly documented or throwing unknown errors that I can't find online ; That doesn't work for me. I need to extract subtitles from the remote file (like http://some-url.com/videos/video.mkv) without downloading the entire file to use it in my web-based application.