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• How to create a Master Playlist for HLS using a Java wrapper library for FFMPEG

  17 janvier 2019, par Abhishek Nandgaonkar

  I am trying to find/use a Java Library that wraps around FFMPEG to create HLS compatible segments and metadata files along with a master metadata file.

  Most existing libraries perform encoding just fine and allow extra functions for additional audio/video parameters. But I could not find a good way for using them to create a master metadata file and other resolution/bandwidth/bitrate based metadata + segments.

  One way that I am planning to go about it is running the piece of code that performs HLS for me multiple times to suit the different bitrates and then programmatically look at the metadata files to compose the master metadata file. But that adds room for errors.

  If you know of an existing library that can do it for me. Please share the details. It would really help out.

  Libraries :

  • https://github.com/bramp/ffmpeg-cli-wrapper
  • https://github.com/hoary/JavaAV
  • https://github.com/kokorin/Jaffree
  • http://www.xuggle.com/

  Documentation (see Section Master Playlist)
  https://developer.apple.com/library/content/referencelibrary/GettingStarted/AboutHTTPLiveStreaming/about/about.html

  FFMPEG command line code that works for me

  ffmpeg -loglevel debug -threads 4 -vsync 1 -i 'id.mp4' -vf yadif -g 29.97 -r 29.97 -b:v:0 5250k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 4200k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 3150k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:a:0 256k -b:a:0 192k -b:a:0 128k -c:a aac -ar 48000  -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -f hls -var_stream_map "v:0,a:0  v:1,a:1 v:2,a:2" -master_pl_name  master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size 0 -master_pl_publish_rate 10 -hls_flags delete_segments+discont_start+split_by_time "vs%v_manifest.m3u8"

  Any help would be appreciated. Thanks in advance.

• No such file or directory : 'ffmpeg' on MacOS in Python

  22 novembre 2023, par Harper Bledsoe

  I am using MacOS (Apple Silicon) and I am trying to use the whisper module from OpenAI in Python. My code is this :

  


  import whisper

file_path = "4547.mp3"
model = whisper.load_model("base")

result = model.transcribe(file_path)
print(result["text"])


  


  When running that code I get the error :

  


  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg': 'ffmpeg'


  


  I think it is because Python is looking in the wrong folder for ffmpeg and therefore can't find it, but I don't know how to fix that if that is the issue.

  


  I have installed homebrew and used the command 'brew install ffmpeg' and it has successfully installed with no errors. I have tried uninstalling ffmpeg and reinstalling it. I have tried uninstalling open_whisper but to no avail.

  


• videotoolbox : require hardware acceleration

  21 août 2015, par Stefano Pigozzi

  videotoolbox : require hardware acceleration
  VideoToolbox also implements a software decoder for h264, and will fallback to
  
  using it if the file cannot be decoded on the GPU. In these cases though,
  
  we want the hwaccel to fail so that we can use the libavcodec software decoder
  
  instead of the Apple one.
  Signed-off-by : wm4 <nfxjfg@googlemail.com>
  

  • [DH] libavcodec/videotoolbox.c