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• Live Streaming WebM with Wowza Server

  2 décembre 2010, par noreply@blogger.com (John Luther)

  Guest blogger Charlie Good is CTO and co-founder of Wowza Media Systems

  As a company, we at Wowza move fast and like to tinker. When WebM was announced in May, we saw it as a promising new approach to HTML5 video and decided to do an experiment with live WebM streaming over http.

  Adding WebM VP8 video and Vorbis audio to the other encoding formats that our server supported was easy (we designed the Wowza server to be codec-agnostic). We then created a WebMfile and implemented WebM HTTP streaming.

  We originally created the demo as a proof-of-concept for the IBC show in September, 2010 but have made it available to watch on our web site.

  The file is streamed live (more precisely, "pseudo-live") over http using the Wowza server-side publishing API (PDF). The result is very impressive ; playback starts fast and the VP8 image quality is fantastic.

  You will need a WebM-enabled browser or VLC media player 1.1.5 to view the live stream.

  If you’re interested in keeping up with Wowza’s WebM progress, visit Wowza Labs or drop us a note at info@wowzamedia.com.

  

• how to scale video using ffmpeg with -filter_complex

  7 juillet 2020, par JuraganFilm

  im trying to encode my video with watermark and subtitles , i and i have this codes that work for watermark and subtitles

  


  ffmpeg -hide_banner -i $video -i $TITLE.ass -loop 1 -i $WATERMARK -loop 1 -i $LOGO -filter_complex "[${videomap}]drawtext=text='${TEXT}':fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:y=h-line_h-100:x=w-(t-${MARQUE})*w/15:y='10':enable='lt(mod(t\,1000)\,100)':fontcolor=orange:fontsize=${FONT}:shadowx=${SHADOWX}:shadowy=${SHADOWY},ass=$TITLE.ass[FID1];[FID1][2:v]overlay=10:${WATERMARKPOSITION}:repeatlast=0:enable='between(t,300,600)'[FID3];[3:v]fade=in:st=1200:d=1.6:alpha=1,fade=out:st=107998:d=1.6:alpha=1[FID6];[FID3][FID6]overlay=10:5:repeatlast=0:enable='between(t,1200,187922)'" -c:v libx264 -x264-params "no-deblock=0:ref=2:weightp=2:chroma_qp_offset=0:keyint=50:keyint_min=5:bframes=3:b_pyramid=1:b-adapt=2:subme=7:b_bias=0:direct=1:weightb=1:open_gop=0:scenecut=40::threads=7:lookahead_threads=1" -b:v 500k -minrate 500k -maxrate 600k -bufsize 1200k -pix_fmt yuv420p -preset ultrafast -profile:v baseline -level:v 3.0 -c:a copy -vf "scale=trunc(oh*a/2)*2:480:flags=bicubic" -use_editlist 0 -movflags faststart -metadata title="${INFOVID} - Visit us @ ${WEBSITE}" -strict -2 -f mp4 -y "${output}/$TITLE-480p.mp4"


  


  and now im trying to scale the video to 480p quality , i've tried using

  


  -vf "scale=trunc(oh*a/2)*2:480"


  


  and also add :flags=bicubic but still i got error .

  


  how to scale video with -filter_complex from those code above ?

  


  thank you before !

  


• Enable cache on ffmpeg to record streaming

  13 mars 2020, par james

  now I’m using steamlink and ffmpeg to record streams and save them to a file, many times the video file saved have so much lag. I found this link https://www.reddit.com/r/Twitch/comments/62601b/laggy_stream_on_streamlinklivestreamer_but_not_on/
  where they claim that the lag problem occurs from the fact of not having the cache enabled on the player.
  I tried putting options -hls_allow_cache allowcache -segment_list_flags cache with the result that the ffmpeg process starts for 8seconds more or less, after which it ends and starts again immediately afterwards without returning a video file,if I don’t put those two options the video is recorded correctly but most of the time with some lag.

  Obviously if I visit streaming from the browser I have no lag problem

  this is the code

  from streamlink import Streamlink, NoPluginError, PluginError
  
  streamlink = Streamlink()
  
  #this code is just a snippet, it is inside a while loop to restart the process
  
  try:
  
      streams = streamlink.streams(m3u8_url)
  
      stream_url = streams['best'].url
  
      #note hls options not seem to work
  
      ffmpeg_process = Popen(
  
          ["ffmpeg", "-hide_banner", "-loglevel", "panic", "-y","-hls_allow_cache", "allowcache", "-segment_list_flags", "cache","-i", stream_url, "-fs", "10M", "-c", "copy",
  
          "-bsf:a", "aac_adtstoasc", fileName])
  
  
  
      ffmpeg_process.wait()
  
  
  
  except NoPluginError:
  
      print("noplugin")
  
  
  
  except PluginError:
  
      print("plugin")
  
  
  
  except Exception as e:
  
      print(e)

  what are the best options to enable the cache and limit the lag as much as possible ?