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• How to update this script to generate HLS video with different resolution streams ? [closed]

  1er décembre 2023, par Andy Z

  I have the following FFmpeg script :

  


  ffmpeg -i video.mp4 -i video.vtt \
 -map 0:v -map 0:a:0 -map 1 \
 -s:v:0 1080x1920 -c:v:0 h264 -b:v:0 500K \
 -c:a:0 copy -c:a:1 copy -c:a:2 copy -c:s webvtt \
 -f hls -hls_playlist_type vod -var_stream_map "v:0,a:0,s:0" \
 -master_pl_name video.m3u8 -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
 -hls_segment_filename "output/hls/%v/seg-%d.ts" output/hls/%v/index.m3u8


  


  Currently it only produces one 1080x1920 stream, how do I produce more lower resolution ones so it can adjust based on client bandwidth ?

  


  Also, I've noticed that it doesn't add the reference to the VTT file to the master HLS playlist ; I had to add this manually but is there a way to make FFmpeg do it for me ?

  


  #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog",URI="0/index_vtt.m3u8"


  


  I've tried this, but I get an argument error :

  


  ffmpeg -i video.mp4 -i video.vtt \
 -map 0:v -map 0:a:0 -map 1 \
 -s:v:0 1080x1920 -c:v:0 h264 -b:v:0 500K \
 -s:v:1 720x1280 -c:v:1 h264 -b:v:1 300K \
 -s:v:2 480x854 -c:v:2 h264 -b:v:2 150K \
 -c:a:0 copy -c:a:1 copy -c:a:2 copy -c:s webvtt \
 -f hls -hls_playlist_type vod -var_stream_map "v:0,a:0,s:0 v:1,a:1 s:1 v:2,a:2 s:2" \
 -master_pl_name video.m3u8 -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
 -hls_segment_filename "output/hls/%v/seg-%d.ts" output/hls/%v/index.m3u8


  


• How to cut video properly with this ffmpeg python script

  11 décembre 2019, par exoboyyeet

  I am trying to write a python script that breaks a video into chunks of less than 64 mb each. This is my for loop that convert each chunk of broken up video :

  for part in range(parts):
  
      print(start, end)
  
      subprocess.run(f"ffmpeg -i {filename} -vcodec copy -acodec copy -ss {start} -t {end} {newfile}\OutputPart{part}.mp4", shell=True)
  
      start = end
  
      end += partlength

  I defined start to be 0 originally, and the end marker to be the length of each part.

  For example, if the video file is 139 mb and 20 mins long, it takes the size divided by 64 [2.171875] turns it into an integer plus 1 in order to add a third part for any amount of video after the last 64 mb marker. Then, it takes that number of parts and divides the length of the video (in our case 20 mins = 1200 seconds) by the number of parts (the variable set previously as parts) which would get us (1200 seconds divided by 3 parts = ) 400 which is the length each part should be (partlength). Now, it runs a loop for the number of parts, to convert a video with the start point (denoted in the ffmpeg command as -ss) originally 0, and the end point (-t), originally the length of 1 part (in our case 400). after the first run through, to make sure the start and endpoints are correct, it prints the start and end points. All the runs say the correct start and endpoints (0-400 ;400-800 ;800-1200). The first and third files convert perfectly, while the second file of the three has from 400-1200 (it includes the third file).

  Is there a reason why it won’t copy the correct segment ?

• Bash Script to convert all flv file in a directory to mp3

  11 août 2014, par UnbrandedTech

  This is my code so far.

  #!/bin/bash
  
  #James Kenaley
  
  #Flv to Mp3 directory converter
  
  
  
  find /home/downloads -iname "*.flv" | \
  
  while read I;
  
  do
  
      `ffmpeg -i ${I} -acodec copy  ${I/%.flv/.mp3}`
  
      echo "$I has been converted"
  
  done

  but its picking up white spaces in the names of the flv files and throws a error saying its not in the directory. how do make it use the whole file name and not the just the first word before the space ?