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• Help me get started with ffmpeg

  10 juillet 2014, par The Muffin Man

  I’ve looked through the documentation on the web site and it is written as if you already know how to use it, in other words it might as well be in Chinese. With that being said, I downloaded it, now what ? There is no exe, it looks like it needs to be compiled... How do I do that ?

  I’ve made about 30 different google searches on getting started with it but no luck.

  I’ve never had this much trouble working with a third party component.

• Streaming is not save on wowza server

  19 septembre 2015, par Android

  I have issue with streaming save to server.
  We have two case :

  case 1.
  I have got one problem on streaming by Javacv with ffmpeg, streaming is work fine and i can see in wowza testing as well as vlc
  But that streaming is not save in wowza server, only save audio file in server.

  case 2.
  I have done streaming by livestreaming library and that work fine as well as save in wowza server.

  both case server is used same but one time it work fine other time it not.

  I have checked settings in wowza server to save any stream and it perfect everything.

• HLS implementation with FFmpeg

  10 août 2015, par Joseph K

  I am trying to implement HLS using FFmpeg for transcoding + segmenting but have been facing a couple of issues that have been bugging me for the past week.

  Issue

  Webserver currently receives live MP4 fragments being recorded on-the-go and needs to take care of transcoding and segmentation.

  As mp4 fragments are being received, they need to be encoded. Then segmented. If i run a segmenter (be it ffmpeg or apple mediastreamsegmenter), every mp4 fragment is being treated as a VOD by itself and I’m not being able to integrate them as part of a larger live event implementation.

  I thought of a solution where every time I receive an mp4 fragment, I first use fmpeg to concatenate it with previous ones to form the larger mp4 that I then pass to be segmented for HLS. That did not work either because the entire stream has to be re-segmented each and every time and existing TS fragments replaced by new ones that are similar yet shifted in time.

  Implementation 1

  ffmpeg -re -i fragmentX.mp4 -b:v 118k -b:a 32k -vcodec copy -preset:v veryfast -acodec aac -strict -2 -ac 2 -f mpegts -y fragmentX.ts

  I manage the m3u8 manifest on my own, deleting old fragments and appending new ones.

  When validating the stream, I find it stacked with EXT-X-DISCONTINUITY tags making the stream unwatchable.

  Implementation 2

  First combine latest fragment with overall.mp4

  ffmpeg -i "concat:newfragment.mp4|existing.mp4" -c copy overall.mp4

  Then pass the combination to ffmpeg for HLS segmentation

  ffmpeg -re -i overall.mp4 -ac 2 -r 20 -vcodec libx264 -b:v 318k -preset:v veryfast -acodec aac -strict -2 -b:a 32k -hls_time 2 -hls_list_size 3 -hls_allow_cache 0 -hls_base_url /Users/JosephKalash/Desktop/test/350/ -hls_segment_filename ’350/fragment%03d.ts’ -hls_flags delete_segments 350/index.m3u8

  Concatenation is not perfect and there are noticeable glitches where the fragments are supposed to be stitched. Segmentation replaces older fragments and the manifest is rewritten as if it’s a new HLS stream every time ffmpeg is called.

  I cannot figure out how to get this to work properly.

  Any ideas ?