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• How to iterate over a certain pattern of file names to use it on FFMPEG and PowerShell

  26 novembre 2019, par Francisco Laferrière

  I’m fairly inexperienced with PowerShell and I use it in certain occasions when I need to have total control of the conversion needed.
  So, I am facing a problem where I have a collection of 20 videos. All share the same number pattern from 1300 to 1319, and I want to convert the whole collection of "MOV" files into "MP4" files using this command :
  ffmpeg -i my-video-1300.mov -vcodec h264 -acodec mp2 my-video-1300.mp4

  Is there a way to use a Regular Expression, wildcard, or whatever name is given to simply create a single line conversion command.
  My idea of what it "should look like" is :
  ffmpeg -i my-video-13[00-19].mov -vcodec h264 -acodec mp2 my-video-13[00-19].mp4

  Of course this last line doesn’t work, but I would like to learn the correct way of doing it.
  Thanks.

• Trying to stream H264 with Janus Gateway to web browser

  15 mars 2021, par sibrown

  I have installed Janus-Gateway using the very comprehensive install instructions on an Ubuntu 18.04LTS machine.
I have configured the streaming config file (janus.plugin.streaming.jcfg) with :

  



  gstreamer-sample: {
  type = "rtp"
  id = 1
  description = "H.264 live stream coming from gstreamer"
  audio = false
  video = true
  videoport = 5004
  videopt = 96
  videortpmap = "H264/90000"
  videofmtp = "profile-level-id=42e01f;packetization-mode=1"
}


  



  (I didn't change the name because that required least changes to other files.)

  



  Having then started the server, I then take a pre-encoded stream and send that to the server with ffmpeg :

  



  ffmpeg -i udp://127.0.0.1:9034 -c:v copy -an -f rtp rtp://127.0.0.1:5004?pkt_size=1300


  



  Opening up the demo webpage the server comes with, I go to streaming demos, and choose the "gstreamer" demo and click start. The right hand half of the screen produces a spinning circle, but tells me that it is receiving data at the appropriate rate for the stream I'm sending. So if it's receiving the stream, why isn't it playing it ?

  



  Cheers,
Simon

  


• How to fix grainy recoding with ffmpeg mp4 x264 ?

  21 mars 2020, par teenserie

  I recorded the audio and video stream from a streaming with ffmpeg. when I go to re-encode the file using libx264, the video in the movements looks bad and grainy as in the image.
Where did I go wrong ?

  



  

  



  this is the code I used

  



  ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4


  



  and these are mediainfo of original file

  



      Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isom
    creation_time   : 2020-03-19T22:43:32.000000Z
  Duration: 00:39:51.99, start: 0.000000, bitrate: 1300 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x1080 [SAR 3:2 DAR 16:9], Closed Captions, 1268 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  mediainfo of the file recoded

  



   Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:39:51.99, start: 0.000000, bitrate: 7924 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 7892 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  How can I recode the file without loss of quality ? (sorry for my poor english)