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• FFmpeg takes too much time for generating m3u8 files from a mp4 file (166MB)

  3 août 2021, par Angele

  I am using ffmpeg in nodejs to generate 4 different resolutions (360p, 480p, 720p, 1080p).
I use a AWS lambda for each resolution and the last two take too much time.
I convert a mp4 file which has a size of 166MB into .ts files (with all segments associated)
It takes more than 900 seconds, and that's above the limit for a lambda timeout.

  


  Also my goal is to encode mp4 videos of a maximum size of 4go... and it would be to encode within 900 seconds maximum for each resolution.

  


  I used this website to find some parameters : https://docs.peer5.com/guides/production-ready-hls-vod/

  


  These are my parameters given to ffmpeg :

  


  "ffmpegParams": [
    "-vf",
    "scale=-2:1920",
    "-c:a",
    "aac",
    "-ar",
    "48000",
    "-c:v",
    "h264",
    "-profile:v",
    "main",
    "-crf",
    "20",
    "-sc_threshold",
    "0",
    "-g",
    "48",
    "-keyint_min",
    "48",
    "-hls_time",
    "4",
    "-hls_playlist_type",
    "vod",
    "-b:v",
    "5000k",
    "-maxrate",
    "5350k",
    "-bufsize",
    "7500k",
    "-b:a",
    "192k",
    "-hls_segment_filename",
    "/tmp/1080p_%03d.ts",
    "/tmp/1080p.m3u8"
]


  


  Also I tried with these parameters '-vcodec', 'libx264', '-preset', 'ultrafast' and it made it faster but it is not enough...

  


  Maybe there's something wrong with my command. If someone could maybe enlighten me ? :)

  


  Edit : I ended up using an EC Fargate, perfect for this kind of need.

  


• How do I get duration of an In Memory Video in Python / Django ?

  19 juillet, par Lucas Tonon

  So I was successfully using the following code to get the duration of a saved video in Django.

  



  def get_video_length(file_path):
command = [
    'ffprobe',
    '-v',
    'error',
    '-show_entries',
    'format=duration',
    '-of',
    'default=noprint_wrappers=1:nokey=1',
    file_path
  ]

try:
    output = check_output( command, stderr=STDOUT ).decode()
except CalledProcessError as e:
    output = e.output.decode()

return output


  



  But now I need to get the duration of an uploaded file before saving it.
I have a serializer with a FileField and on validate method I should check the video duration.
For instance :

  



  class VideoSerializer(serializers.Serializer):
video = serializers.FileField(required=True, validators=[validate_media_extension, validate_video_duration])


  



  Then on validate_video_duration I needed to call some method like get_video_length, but I need an alternative to get the duration from the video in memory. The object that I have is an instance of InMemoryUploadedFile (https://docs.djangoproject.com/en/2.2/_modules/django/core/files/uploadedfile/)

  


• releases doc formating

  13 février 2013, par jonrohan

  m docs/releases.md
  

  releases doc formating