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• HLS with FFmpeg, browser skips m3u8 in sequence

  16 octobre 2019, par Jongseok Yoon

  I’m writing a program with C++, receiving 2-second-long mp4 video and converting it to m3u8 and same-duration ts files in real-time.

  Problem is when I check it with browsers on PC, it doesn’t load m3u8 properly.

  For example, when I start to watch m3u8, it loads first m3u8 with #EXT-X-MEDIA-SEQUENCE : 1, then it keeps loading first m3u8, then suddenly skips to #EXT-X-MEDIA-SEQUENCE : 4 or larger.

  Streaming still works, but it is very unstable due to that problem. It loads some ts together, then loads nothing while loading same m3u8 it already loaded, and skips 3 or more m3u8 and loads ts files together and again.

  ffmpeg -loglevel level+warning -i SOURCE.mp4 -an -filter:v fps=fps=10 -f hls -hls_list_size 7 -strftime 1 -hls_segment_filename '1.ts' -hls_flags append_list+omit_endlist DEST.m3u8

  This is ffmpeg command in my program, using hls_segment_filename option to overwrite ts files so I limit number of files under 100, and it runs every 2 second.

  Maybe, I’m overwriting it too fast to be loaded ?

• I am trying to develop On demand and live streaming video analysis using java.?

  2 avril 2020, par PATEL UJASH

  After a lot of R&D I got something for video analysis.I am gonna use Kafka, spark and openCV. But i am suck in how to deliver streaming on demand and live streaming video. I got FFMPEG help to capture video from different devices or you can stream any Video File too. FFMPEG also help in Video encoding and decoding also. But after encode the video we need to send that data Into any streaming engine like wowza streaming engine, Red5 or AWS media elemental services. I watch some video they have used OBS software for stream.

  



  What if i want to stream it using FFMPEG and publish the video streaming on RTMP link. That link are generated by wowza streaming engine or aws media elemental service like rtsp://[wowza-ip-address]:1935/[application]/[stream-name] ?

  



  How to deliver different video frames resolution according to bandwidth ?.

  


• Is there any way in ffmpeg to cut a video with embedded subtitles and multiple audio tracks accordingly ? [closed]

  21 février 2024, par Harsh

  I have a video which had multiple audio tracks and embedded subtitles. I tried using ffmpeg to cut it, but I could not get the subtitles with it, nor the audio tracks. Here's the command I tried :

  


  ffmpeg -i input.mkv -ss 00:01:16 -to 00:02:46 -map "[0:0]:v" -map "[0:3]:a" -map "[0:4]:s" -c copy output.mkv 


  


  I tried using this command -

  


  ffprobe -v info input.mkv


  


  to collect information about the streams and substituted the streams, but for some reason it gave an error which read something along the lines of - Output with label 0:0 does not exist. Is there an alternative to achieve the result I wish ?

  


  Edit - I tried this command :

  


  ffmpeg -i input.mkv -ss 00:01:16 -to 00:02:46 -map 0 -c:a copy -c:s copy output.mkv


  


  It does the task BUT I have trouble seeing the video on my pc, it just shows a black screen (VLC) but on my mobile when I watch it using PLAYit, it works fine but I can't see the first 8 seconds for some reason. Anyways fix for this ?