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• ffmpeg error : Could not write header for output file #0 (incorrect codec parameters ?) : No such file or directory

  6 mars 2021, par Syed Uddin

  I have the following files in the Convert_video_to_HLS folder on my Desktop :

  


  

  • input

  


  • output

  


  • script.sh

  


  • video.key

  


  • video.key.info

  


  


  The command I'm running is :

  


  bash ./Desktop/Convert_video_to_HLS/script.sh ./Desktop/Convert_video_to_HLS/input ./Desktop/Convert_video_to_HLS/video.key.info ./Desktop/Convert_video_to_HLS/video.key ./Desktop/Convert_video_to_HLS/output


  


  The contents of script.sh

  


  #!/bin/sh
DIR=$1
DIR_KEY_INFO=$2
DIR_KEY=$3
OUTPUT=$4
echo $DIR
# List all mp4 files on folder
MP4_DIRS=$(find $DIR -type f | grep -E "\.mp4$")
mkdir -p $OUTPUT
for addr in $MP4_DIRS
do
FILE=$(basename $addr .mp4)
mkdir -p $OUTPUT/$FILE
cp $DIR_KEY $OUTPUT/$FILE/
ffmpeg -i $addr -codec: copy -start_number 0 -hls_time 20 -hls_list_size 0 -hls_key_info_file $DIR_KEY_INFO -f hls $OUTPUT/$FILE/$FILE.m3u8
done


  


  The error message i get is :

  


  [hls @ 0x7fd654012400] Opening './Desktop/Convert_video_to_HLS/video.key.info' for reading
[hls muxer @ 0x7fd65401c600] error opening key info file ./Desktop/Convert_video_to_HLS/video.key.info
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
    Last message repeated 1 times


  


  Help appreciated. FYI I'm new to bash script and following a tutorial so a breakdown would be appreciated.

  


  Update :
I have placed the files in my root directory and run the following command, and it seems to work.

  


  bash ./script.sh ./input ./video.key.info ./video.key ./output


  


  Therefore, for some reason, the folder directory is not being referenced correctly.

  


• How to merge a segmented webvtt subtitle file and output a single srt file ?

  24 janvier 2019, par Dobbelina

  How to merge a segmented webvtt subtitle file and output a single srt file ?,
  m3u8 looks like this example :

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-MEDIA-SEQUENCE:1
  
  #EXT-X-INDEPENDENT-SEGMENTS
  
  #EXT-X-TARGETDURATION:4
  
  #USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
  
  #EXT-X-ENDLIST

  I noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
  If ffmpeg could be used to do this, what magic input do i need to give it ?

  A single correctly cued vtt file would work to.
  Thanks for any replies you lovely people !

• Produce an adaptive multi-resolution mpeg-dash file from an input video file

  1er mars 2021, par Tariq Hasan

  I can produce different resolution mpeg-dash videos from running these commands separately and get one .mpd file for each of the resolutions :

  


  ffmpeg -i /path/to/input.mp4 -vf scale=1920:1080 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=1280:720 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=720:480 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=640:360 /path/to/output.mpd


  


  The question is, how do I get a single .mpd file that maps to all these different resolution videos which would be adaptive in resolution when streamed over the network ?