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• No implementation found for boolean when using libffmpeg.so

  7 mars 2019, par pramod nimbalkar

  i am working for sample YouTube live streaming through my application but I am getting no implementation found for Boolean

• 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 ?

• rtmpproto : use AVHMAC instead of a custom implementation

  29 juillet 2015, par James Almer

  rtmpproto : use AVHMAC instead of a custom implementation
  Signed-off-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtmp.h
  • [DH] libavformat/rtmpproto.c