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• FFMPEG UDP MPEG2TS to Cable TV Channel - Video & Audio Problems

  30 janvier 2019, par user2884023

  Channel Feed Distored Picture

  $ ffmpeg
  
  -re
  
  -i playlist1.txt
  
  -b:v 15000k 
  
  -bufsize 15000k
  
  -maxrate 16000k
  
  -f mpegts "udp://XXX.XXX.X.XXX:XXXX"

  I have mpeg2.ts files encoded to CBR15mbs.
  The files are set to different frame rates. Although initial testing was just playing 1 file.
  They are currently 1080p I think without declaring the frame rate, they are defaulting to 30fps.
  From the server locally via Port2 (that we are using to send our feed), everything plays fine via FFPLAY.
  The final out put local CATV is pixelated and distorted, the video is missing data playing slowly and the audio is choppy / distorted.
  I even tried just a 192kps .mp2 and it played distorted on the CATV channel.
  They set me up with a cable modem. 2 ports, 1 WAN, 1 a dedicated port to feed their head end and I have a fiber synchronous 20/20 connection.

  I am guessing its a packet issue, perhaps on our end with our FFMPEG setup ? And maybe FFPLAY isn’t as sensitive to the actual distro process.

  Perhaps the secret lies here, but there isn’t much info about them, even scouring the net.

  ?pkt_size=188&buffer_size=65535

  For example what is this one :

  broadcast=1|0

  Explicitly allow or disallow UDP broadcasting.

  I apologize if data is missing, please ask questions. I didn’t want to write a novel.

  I am hoping some can provide the correct code so my signal is corrected. I assume the problem is on our end, and not the CATV end. At least I can try some solutions on our end first. I can make real-time FFMPEG changes to the server, and see the channel results instantly so that helps.

  Finally, the fact it wouldn’t even play a .mp2 audio file cleanly on the channel, does make me wonder, is there a problem on their end, or is it a config on our end, and we just need the correct answer ?

• Trying to change extension of filename on an ffmpeg script

  22 janvier 2019, par prat67

  (first time posting a question here)

  So I’m looking to write a ffmmpeg script to automate encoding my files to VP9.
  The problem I’m having is when I try to strip the extension and add a new one.

  For example
  Demo.mp4

  Should change to
  Demo.webm

  I’m running this on a Ubuntu-16.04 (Server Non-GI Version)
  I’ve tried a few different ways to accomplish this (using google and other posts on StackOverflow) but I can’t seem to make it work

  This is the error I keep getting..

  line 31 : Demo.mp4+.vp9 : syntax error : invalid arithmetic operator (error token is ".mp4+.vp9")

  I’ve also commented (in the code below) where the syntax error is pointing to..

  #!/bin/bash
  
  
  
  # Welcome Message
  
  
  
  clear
  
  printf "====================================\n"
  
  printf "FFMPEG Encoder\n"
  
  printf "(Using HDR-4k Profile)\n"
  
  printf "====================================\n\n"
  
  printf " Loading Files in Current Directory...\n\n"
  
  sleep 3s
  
  
  
  
  
  # Variables
  
  
  
  i=1
  
  ext=".webm"
  
  vadd=4000000
  
  vsub=2000000
  
  
  
  
  
  # Iterate through files in current directory
  
  
  
  for j in *.{mp4,mkv};
  
  do
  
  echo "$i.$j"
  
  file[i]=$j
  
  i=$(( i + 1 ))
  
  done
  
  
  
  
  
  # Select File & Bitrate
  
  
  
  printf "Enter file number\n"
  
  read fselect
  
  printf "${file[$fselect]}: Selected for encoding\n\n"
  
  
  
  printf "Enter Average Bitrate (Eg: 8000000)\n\n"
  
  read bselect
  
  
  
  
  
  # ***THIS IS WHERE THE PROBLEM IS***
  
  # Prepare output file, strip trailing extension (eg .mkv) and add .webm
  
  
  
  ftemp1="${file[$fselect]}"
  
  ftemp2="${ftemp1::-4}"
  
  fout="$(($ftemp2+$ext))"
  
  printf "Output file will be: $fout"
  
  printf "Preparing to encode..."
  
  sleep 5s
  
  
  
  
  
  # Encode with User-Defined Parameters
  
  
  
  ffmpeg -y -report -i ${file[$fselect]} -b:v $bselect -speed 4 -pass 1 \
  
    -pix_fmt yuv420p10le \
  
    -color_primaries 9 -color_trc 16 -colorspace 9 -color_range 1 \
  
    -maxrate "$(($bselect+$vadd))" -minrate "$(($bselect-$vsub))" \
  
    -profile:v 2 -vcodec libvpx-vp9 -f webm /dev/null && \
  
  ffmpeg -y -report -i ${file[$fselect]} -b:v $bselect -pass 2 \
  
    -pix_fmt yuv420p10le \
  
    -color_primaries 9 -color_trc 16 -colorspace 9 -color_range 1 \
  
    -maxrate "$(($bselect+$vadd))" -minrate "$(($bselect-$vsub))" \
  
    -profile:v 2 -vcodec libvpx-vp9 \
  
  $fout

  I’m certain there is a much cleaner way to do this - but I’m not expecting help with that :P

  My suspicion is that I’m trying to add two different types of variables ? But I thought I defined them as strings..I could be wrong

  Please Help... lol

• How to create video and audio files for the Media Source Extension API ?

  5 décembre 2018, par Aman

  I have created a video player from the Media Source Extension API. I have split the video and audio from the original.mp4 (1 minute duration). I have split the video and audio into small 5 second files (12 files in total). I’m getting each one of them and playing them together. But the video stops playing at around 45-47 seconds. I cannot understand to why the video is stopping/buffering. I cannot understand whether the problem is in the javascript code or the video files ?

  I have uploaded all the resources here (https://drive.google.com/file/d/1NHc_yNRU0tvaU18aohLy74Js3y7UHD4N/view?usp=sharing). And written the commands I used to construct my video and audio files below. I have also noticed that this problem only occurs with Google Chrome and works perfectly and smoothly on Microsoft Edge. Thanks

  Making the Media files:

  Extracting video from original.mp4: MP4Box -single 1 original.mp4

  Extracting audio from original.mp4: MP4Box -single 2 original.mp4

  Splitting the video and audio into 5 second parts: ffmpeg -ss starting-time -to end-time -i (video.mp4 OR audio.mp4) (video_part.mp4 OR audio_part.mp4)

  Fragmenting all the video and audio parts: MP4Box -dash 1000 -rap -frag-rap(video_part.mp4 OR audio_part.mp4)

  Then using the fragmented video and audio files to be played via the Media Source Extension API video player. e.g. (video_part_dashinit.mp4 OR audio_part_dashinit.mp4)