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• overlay audio volume histogram over static image

  10 décembre 2018, par Simone Sole

  I’m actually working to a project for music video generation using ffmpeg.
  I’d like to know if it’s possibile to use ffmpeg itself or a combination of command line component under windows environment to make a visualization of audio spectrum (ahistogram ?) over a static background image like the one I found on the web :

  

  Any ideas or coding tips ?

• 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 ?

  


• Unable to import MediaPlayer after installing FFmpeg and ffpyplayer.

  17 décembre 2018, par Sumi

  I am getting many warnings like this when I run make command CC  fftools/ffmpeg_opt.o fftools/ffmpeg_opt.c: In function ‘add_input_streams’: fftools/ffmpeg_opt.c:777:13: warning: ‘codec’ is deprecated [-Wdeprecated-declarations] if (st->codec->lowres) { ^~ In file included from fftools/cmdutils.h:30:0, from fftools/ffmpeg.h:28, from fftools/ffmpeg_opt.c:23: ./libavformat/avformat.h:878:21: note: declared here AVCodecContext *codec; ^~~~~ Is this somehow related ?

  And this is the output when i try to import MediaPlayer :

  Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/pi/.virtualenvs/cv/local/lib/python3.5/site-packages/ffpyplayer/player/__init__.py", line 10, in <module>
   from ffpyplayer.player.player import MediaPlayer</module></module></stdin>

  ImportError: /home/pi/.virtualenvs/cv/local/lib/python3.5/site-packages/ffpyplayer/player/player.cpython-35m-arm-linux-gnueabihf.so: undefined symbol: x264_levels