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• How to downscale video using subprocess and then piping the data over to stdout and play using ffplay and save it as well

  2 avril 2021, par ZeroDay Fracture

  I am trying to use ffmpeg to downscale a video and pipe the stdout data to ffplay to play the new downsized video by piping it to ffplay on aws lambda.

  


  This is the command I have so far, but for some reason adding a scale option is not working.

  


  I am trying to run this command locally before I deploy it on python with subprocess command. I need the raw video to be able to save into database for streaming the data in realtime.

  


  %ffmpeg -i sample.mp4  -vf scale=240:-2 -f  mpegts -c:v copy -af aresample=async=1:first_pts=0 - | ffplay -

  


  adding the scale optioin for some reason is saving the video as the name scale=240 :-2 which does not make sense.

  


• How to play an local video in arbitrary codec and format in browser ? [closed]

  24 septembre 2023, par HanXu

  I am developing a video player in browser to let the user select a local video to play, and want to support as many video formats as possible. I know that in browser a video tag can only play videos in a limited set of codecs, and on desktop libraries like VLC can play literally any videos. I would like to bring that broad compatibility to the browser, but not sure how to achieve it.

  


  One thing come up in my mind is to let the user run a thin client natively, which read the local video and stream it at, say, http://localhost:8080, in some web-friendly codec and format, and in the frontend I use a video with src to be http://localhost:8080.

  


  In the client I think I need to run some ffmpeg command to somehow stream and process the video in real-time. I also run into the libVLC which seems nice, and am not sure which one to use.

  


  Furthermore, I need to enable the user to seek to any arbitrary timestamp, and am not sure if the streaming technic supports it.

  


  I have done some googling, and found a method which first runs a ffmpeg command as

  


  VIDSOURCE="/some/video.mp4"
AUDIO_OPTS="-c:a aac -b:a 160000 -ac 2"
VIDEO_OPTS="-s 854x480 -c:v libx264 -b:v 800000"
OUTPUT_HLS="-hls_time 10 -hls_list_size 10 -start_number 1"
ffmpeg -i "$VIDSOURCE" -y $AUDIO_OPTS $VIDEO_OPTS $OUTPUT_HLS /some/public/video.m3u8


  


  and in the frontend I can use the react-player to play the video like

  


  <reactplayer url="/some/public/video.m3u8"></reactplayer>&#xA;

  


  However, I can not seek to an arbitrary timestamp, and the ffmpeg command creates a lot of .ts files one by one about which I am not sure what is going on. It seems that before it creates a video77.ts, I can not seek to timestamp within that segment.

  


  All in all, I am looking for some solution like

  


  

  


  that supports

  


  

  • playing videos in browsers in as many codecs and formats as possible,

  


  • allowing users to seek to any arbitrary timestamp.

  


  


  Since many native video player like VLC supports it, I believe it can be done. Does anyone have any idea that may help ? Appreciate in advance !

  


• Avplayer can not play streaming link from youtune on ios 7

  12 septembre 2015, par thaitujim

  I have a problem. Im trying to play audio streamming from youtube response.
  When i fecth youtube to get real Stream audio. And then i get real link

  example in this case is : "https://r6---sn-8qj-nbol.googlevideo.com/videoplayback?id=3c9bf82a23c991cb&itag=140&source=youtube&requiressl=yes&mv=m&ms=au&mm=31&gcr=vn&ratebypass=yes&mime=audio/mp4&gir=yes&clen=3662991&lmt=1394274529113749&dur=230.574&signature=232B6692726E12E9CFAEAC0C3990648710FCAE04.733EBD94E30ED230299CFA2E993577D656E18457&sver=3&fexp=907259,930666,932404,943909,947209,947215,948124,952302,952605,952901,953745,953913,957103,957105,957201&key=dg_yt0&upn=_bm8tftRoZM&mt=1415673491&ip= XXX.XXX.XXX.XXX &ipbits=0&expire=1415695122&sparams=ip,ipbits,expire,id,itag,source,requiressl,mv,ms,mm,gcr,ratebypass,mime,gir,clen,lmt,dur"

  with itag = 140, this link contain only audio format.

  and this problem here.
  when i handle it by Avplayer, i work well on IOS 8 device. but on IOS 7 device. it’s not working. Does Anybody can help me fix it or give me any solution.

  my code is very simple.

  self.mSongPlayer = [[AVPlayer alloc] initWithURL:urlAudio] ;
  self.mSongPlayer play] ;

  with urlAudio link is this link above.

  i tried with normal Stream link. example is : http://www.abstractpath.com/files/audiosamples/sample.mp3
  and it work normaly on same ios7 and ios8.

  thanks everybody.