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• 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 ?

  


• Covert a file from mp4 to a file that HTML can display

  26 juin 2019, par Trying_To_Understand

  I have a mp4 file and I want to display it in HTML. The problem is that it won’t, not only in HTML but also in my player. In VLC I can watch the video but there is no sound. Maybe the file is corrupted ?
  This is the output when I run ffmpeg -i my_file.mp4 :

  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  [h264 @ 000001b4afc61880] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  Input #0, mpeg, from '150_2.mp4':
  
    Duration: 00:50:51.75, start: 13182.386222, bitrate: 983 kb/s
  
      Stream #0:0[0x1e0]: Video: h264 (High), yuv420p(progressive), 1280x720, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x1c0]: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
  
  At least one output file must be specified.

  Can I convert this with ffmpeg to a good quality of video and audio ?