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• How to decrypt AES 128 encrypted HLS stream when URI for key is "k/timestamp"

  25 janvier 2021, par Wilfred Almeida

  I have downloaded 1784 .ts files and they are AES 128 encrypted.

  


  The .m3u8 file has #EXT-X-KEY:METHOD=AES-128,URI="k/timestamp",IV=0x496daa1c6914000e408c65cead91fc29 which I guess indicates that the key must be in a file named timestamp. I got the "timestamp" file and now I want to decrypt.

  


  I tried replacing the URI with URI="file:timestamp" with all the .ts, the .m3u8 and the timestamp file all in same directory and ran the ffmpeg command

  


  ffmpeg -allowed_extensions ALL -protocol_whitelist file,tcp,crypto,http,https  -i playlist.m3u8 -c copy op.mp4

  


  but got the errors Error when loading first segment 'hls_350k_000.ts'                                  playlist.m3u8: Invalid data found when processing input even though it opened the file successfully.

  


  I tried specifying the URI as URI="http://localhost/mydir/timestamp" but got the same error as specified above. I had all .ts,.m3u8,"timestamp" file in XAMPP's htdocs folder.

  


  When I open the "timestamp" file in browser's inspect->Network->Click on file->preview, I see weird text like kf¯2“.ú¸“Á•ª   Bn5ydr/x$.9+cgKC!<ßû¢ÌNñ®jûŸŸ and it changes everytime I refresh the site.

  


  I specified the link of the file in URI and tried, same error.

  


  I tried specifying .key extension to the "timestamp" file, same error.

  


  I downloaded the "timestamp" file by entering its URL into browser which I got from inspect->Network->Click on file->Headers, I didn't download it as HAR or other stuff.

  


  I tried playing the .m3u8 file in chrome using chrome by using Native HLS Playback extension with files hosted using XAMPP but it doesn't play, video player shows loading and the chrome's console has following errors

  


  (anonymous) @ player.js:57
player.js:11 trying to recover from media Error ...
handleMediaError @ player.js:11
hls.0.12.4.min.js:1 Uncaught (in promise) DOMException: The play() request was interrupted by a new load request.
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:17 trying to swap Audio Codec and recover from media Error ...
handleMediaError @ player.js:17
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:22 cannot recover, last media error recovery failed ...
handleMediaError @ player.js:22
DevTools failed to load SourceMap: Could not load content for chrome-extension://emnphkkblegpebimobpbekeedfgemhof/hlsjs/hls.min.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME


  


  I tried combining the .ts files using ffmpeg but got the same errors specified above.

  


  How do I decrypt the files and combine them into a single vlc playable file ?

  


• FFMPEG amix filter causes main audio stream to cut out

  21 janvier 2019, par user3600107

  So I have a video called 1.mkv and would like to mix in a variety of different audio clips at certain points. To do this I’m using the -filter_complex option. However, I’m running into some problems because when ffmpeg tries to mix in the first audio stream the audio works for a short while when the clip is playing and then all audio cuts out. I’m running ffmpeg version 2.8.15-0(which is up to date with my distro). Another "weird" thing about the video output is that in xplayer the video will freeze after the audio cuts out, and will work if you skip far enough ahead in the video(not sure if this is helpful but it might give some extra clues).

  Full command :

  ffmpeg -i "1.mkv" -i "5.wav" -i "2.wav" -i "3.wav" -i "6.wav" -i "7.wav" -i "4.wav" -i "9.wav" -i "8.wav" -i "10.wav" -filter_complex "[0:0]setdar=4/3[v0];
  
  
  
  [2:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=20000|20000,volume=0.5[ad2];
  
  
  
  [4:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=900000|900000,volume=0.5[ad4];
  
  
  
  [3:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=300000|300000,volume=0.5[ad3];
  
  
  
  [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=720000|720000,volume=0.5[ad1];
  
  
  
  [7:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1140000|1140000,volume=0.5[ad7];
  
  
  
  [9:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1260000|1260000,volume=0.5[ad9];
  
  
  
  [8:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1020000|1020000,volume=0.5[ad8];
  
  
  
  [5:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=960000|960000,volume=0.5[ad5];
  
  
  
  [6:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=480000|480000,volume=0.5[ad6];
  
  [0:1]volume=1[ad0];
  
  [ad0][ad2][ad4][ad3][ad1][ad7][ad9][ad8][ad5][ad6]amix=inputs=10:duration=first:dropout_transition=0,dynaudnorm[a0]" -map "[v0]" -map "[a0]" -c:v libx264 -ar 44100  -c:a libmp3lame -preset ultrafast -crf 17 -b:v 1M out2.flv

  partial command

  ffmpeg -i "1.mkv" -i "2.wav" -filter_complex "[0:0]setdar=4/3[v0];
  
  [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=20000|20000,volume=0.5[ad2];
  
  [0:1]volume=1[ad0];
  
  [ad0][ad2]amix=inputs=2:duration=first:dropout_transition=0,dynaudnorm[a0]" -map "[v0]" -map "[a0]" -c:v libx264 -ar 44100  -c:a libmp3lame -preset ultrafast -crf 17 -b:v 1M out2.flv

• ffmpeg errors while opening encoder ... and says that there are *maybe* incorrect parameters ?

  3 janvier 2017, par Michael Heuberger

  Just yesterday my app threw a weird ffmpeg error I cannot figure out :

  ffmpeg exited with code 1 : Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  The ffmpeg command itself was :

  ffmpeg -f image2 -thread_queue_size 2048 -framerate 15.0 -i /var/www/blahblah/frames/%d.jpg -y -an -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -crf 0 -loglevel info /var/www/blahblah/preview.mp4

  Basically I am just generating a MP4 based on image frames here without sound. Using ffmpeg version 3.05 here :

  ffmpeg version 3.0.5-0ubuntu0.16.10.1 Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
 configuration: --prefix=/usr --extra-version=0ubuntu0.16.10.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-chromaprint --enable-libx264
 libavutil      55. 17.103 / 55. 17.103
 libavcodec     57. 24.102 / 57. 24.102
 libavformat    57. 25.100 / 57. 25.100
 libavdevice    57.  0.101 / 57.  0.101
 libavfilter     6. 31.100 /  6. 31.100
 libavresample   3.  0.  0 /  3.  0.  0
 libswscale      4.  0.100 /  4.  0.100
 libswresample   2.  0.101 /  2.  0.101
 libpostproc    54.  0.100 / 54.  0.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  Can you spot anything wrong with the above command that could cause this error ? And why does ffmpeg say maybe ? Shouldn’t ffmpeg be able to say exactly what caused the problem ?

  Thanks for any hints.