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• Audio Lag Issue in Long-term FFmpeg Live Streaming with x11grab and Pulse

  8 juillet 2024, par Dhairya Verma

  I am currently working on a live streaming project where I use FFmpeg with x11grab and PulseAudio to stream headlessly from a Linux server to an RTMP endpoint. While the setup generally works well, I am encountering an issue where the audio begins to lag behind the video after approximately two days of continuous streaming.

  


  "-hwaccel", "cuda",

"-f", "x11grab",

"-s", "1920x1080",

"-draw_mouse", "0",

"-thread_queue_size", "1024",

"-i", ":1",

"-f", "pulse",

"-r", "60",

"-thread_queue_size", "1024",

"-i", "VirtualSink.monitor",

"-c:v", "h264_nvenc",

"-preset:v", "hq",

"-b:v", "2500k",

"-maxrate", "2500k",

"-bufsize", "10000k",

"-vf", "fps=60,crop=1280:720:320:180,format=yuv420p",

"-g", "60",

"-c:a", "aac",

"-af", "adelay=900|900",

"-b:a", "128k",

"-ar", "44100",

"-fps_mode", "cfr",

"-async", "1",

"-f", "flv",

'RTMP_LINK',


  


  After two days of streaming, the audio noticeably lags behind the video. I have tried adjusting various settings and buffers, but the issue persists.

  


  Could anyone please provide any insights or suggestions on how to address this issue ?

  


• Server side video merging with FFmpeg through oline form

  1er août 2017, par San007

  I have a difficult problem and not enough knowledge to solve it, therefore I am hoping you guys can give me some advice or redirect me to a professional or professional software which can solve my problem.

  I want something fairly simple but I simply do not know how to begin. I Googled extensively but didnt find any related topics.

  What do I want ?
  I want an online form on my website where people can select different options, which are videos, for example
  Question 1
  1 (1.mp4) / 2 (2.mp4) / 3 (3.mp4)
  Question 2
  X (X.mp4) / Y (Y.mp4) / Z (Z.mp4)
  Question 3
  Email adres :
  Generate

  When the visitor clicks the generator button it should merge the video’s the customer has selected. e.g. 1 and X will result in one video file of 1.mp4 and X.mp4 merged. The system should then after succesfully merging the videos send a download link to the users e-mail adres and ideally delete the video from the server afterwards.

  I know I have not done a whole lot of research because my knowledge simply is not enough to create my own solution, but I hope you guys can send me in the right direction, I do not mind any commercial solution.

• Local file creation of ffmpeg hls http stream

  10 juillet 2018, par Emilian

  After researching all the options for ffmpeg hls streaming and setting it up for uploading to a http server i encountered a problem, ffmpeg also creates local files for the segment/playlist in the current working directory.

  What im trying to achieve is upload to a server and serve the segments and playlist from memory and not from disk. Tried setting a http url for segments like this :

  ffmpeg -re -i filter_test.ts -f hls -hls_segment_filename http://localhost:3000/segment/playlist_%03d.ts -method PUT http://localhost:3000/segment/playlist.m3u8

  but that also didnt work.

  Is there any way to stop ffmpeg from creating local files for the hls stream and only upload them to the server ?

  In the logs it says

  [hls @ 00000274041104e0] Opening 'http://localhost:3000/segment/playlist_000.ts' for writing
  
  [http @ 00000274046a2fa0] request: POST /segment/playlist_000.ts HTTP/1.1

  but nothing about writing it to a file.