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• FFMPEG mkv to mp4 conversion lacks audio in HTML5 player

  3 avril 2020, par fmc

  I used ffmpeg to convert an mkv file to mp4 using this command line :

  



  ffmpeg -i input.mkv -c copy file-1.mp4


  



  The resulting mp4 plays fine (video and audio) on Linux Mint's Xplayer. But after uploading file-1, it played with no audio. So I uploaded another mp4 file-2, one I didn't have to convert, and it plays both video and audio without a problem. So whatever's going on with file-1 seems to be with my use of ffmpeg.

  



  The player I'm using is called afterglow. But the HTML5 player handles these two files the same way : file-1 & file-2

  



  Does anyone know why the ffmpeg converted file is soundless when played online ? Is there a different conversion command that ensures converted mkv files will play with sound by online players ?

  


• Stopped ffmpeg ip camera recording

  25 août 2016, par Amit Yadav

  I am using foscam ip camera. I want to record its stream in ts chunks and put no video screen when there is no stream available. I want to record 24 hrs video but I am not able to record it up to 24 hr. FFMPEG command stops inbetween. I am using below ffmpeg command

  ffmpeg -rtsp_transport tcp -i rtsp ://username:password@192.168.0.68:554/videoMain -t 86400 -c:v copy -c:a copy -map 0 -f segment -segment_time 10 -strftime 1 -segment_list_type m3u8 -segment_list /home/user/Desktop/rec/del20160725111733.m3u8 -segment_format ts -y /home/user/Desktop/rec/%Y%m%d%H%M%S.ts

  want no video screen like this http://www.electro-tech-online.com/customimages/2011/03/preview409-1.jpg

  Or any other way to record stream using java code so that I have more control over stream to check if it is recording or not.

• Streaming Encoded MPEG-4 live video from a web camera using RTP in C++

  6 mars 2017, par Maad A.Galil

  I have been working on building a video streamer from a webcam using RTP protocol in C++ language in Linux. I was able to use opencv to take frames from the webcam and send them frame by frame to a client app that shows those frames one by one using the same frame per second parameter.

  But that is mostly a MJPEG kind of transfer as the encoding used is JPEG encoding with a specific quality for each frame. However, I would like to use MPEG-4 encoding before transferring the video. After a deep search online I found out that ffmpeg is the best for such purpose. But the samples online mostly work through a command line interface to capture a webcam video and save it as a video file with the given encoding and format.

  What I am asking about here. Is there a possibility to encode the webcam "LIVE", and get byte data while encoding the camera stream. I would like to use those byte data to transfer it using RTP for example. And then I would like to decode the received byte data and show the video using opencv imshow function for example.

  I hope that I could explain my question clearly.

  Thanks in advanced,

  Yours,
  Maad