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• x264 on Ubuntu video bad/corrupted

  6 septembre 2013, par Ryzone

  I am trying to use command line x264 to produce a blu-ray compatible file for use in Adobe Encore. For the source file I've tried both ProRes and mpeg2, both 1080p24. Both files import into Encore fine (no transcoding needed which is great) but the ProRes version is pink and grey "static" and the mpeg2 is just a bunch of green/black lines. The exact same files and the exact same commands on my Win7 PC come out fine. I'm only doing a 10 sec sample of the complete 90min movie. I'd love for it to work on Ubuntu cause it is running a new i7 haswell that encodes much quicker than my PC (many hours difference in encoding time)

  Ubuntu 13.04
  
  
  
  x264 0.135.2 f0c1c53<br />
  
  built on Jul 24 2013, gcc: 4.7.3<br />
  
  configuration: --bit-depth=8 --chroma-format=all<br />
  
  x264 license: GPL version 2 or later
  
  
  
  command:
  
      x264 --bitrate 30000 --preset veryslow --tune film --bluray-compat --fps 24000/1001 --force-cfr --bframes 3 --ref 4 --muxer raw --no-weightb --weightp 0 --b-pyramid none --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --profile high --keyint 24 --min-keyint 1 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1  -o output.264 --input-res 1920x1080 sample.mov

  (if it would work I'd be doing two pass encoding)

  I am able to encode the sample file with ffmpeg to h264 (if that helps).

• FFmpeg not found for manim installation

  19 février 2023, par Jason Grace

  I was trying to install manim so I ran the following commands in my VScode terminal

  


  >>pip install manim
>>pip install FFmpeg-python


  


  However, when I ran a sample manim program on VScode(copy pasted from the tutorial), I received the following information.

  


  RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work
  warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)


  


  I have tried downloading a pre-compiled ffmpeg from https://ffmpeg.org/download.html#build-windows, but when I downloaded it there was no way to unzip it.
My code below :

  


  from manim import *


class CreateCircle(Scene):
    def construct(self):
        circle = Circle()  # create a circle
        circle.set_fill(PINK, opacity=0.5)  # set the color and transparency
        self.play(Create(circle))  # show the circle on screen


  


  Tutorial/Installation guide link I used :
https://docs.manim.community/en/stable/installation/windows.html#required-dependencies

  


  Please note that I am on a windows 64-bit computer

  


  Can anyone help me install manim or ffmpeg properly ?

  


• ffmpeg : get aspect ratio of input video

  1er janvier 2013, par user732274

  I wrote a shell script which accepts any video file (I mean any kind of dimensions, any sort of rotation, etc.) and it uses ffmpeg to pad that video to 720x576 (resizing it) in order to make it perfectly suitable for a video-dvd without requiring the user to calculate anything. Now : I know I can access the size of the input video by using "iw" and "ih" keywords (in the -vf syntax), but I don't know what's the keyword to access its aspect ratio (of course I don't need to read it in the ffmpeg output : I need to access it in the command line).