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• How to set background transparency for animation with ffmpeg

  23 octobre 2023, par Jan Turowski

  I am creating animated physics graphs with a transparent background for later use in a NLE. On my old machine at work they display and render with background transparency just fine. The exact same code however loses background transparency in the ffmpeg render on both my Linux and my Windows machine at home. The animations are displayed just fine on all machines.

  


  As I first thought it was a Linux issue, I tried to run the code on my Windows machine expecting it to work again. Unfortunately it did not.

  


  Reduced code :

  


  import numpy as np
import matplotlib.pylab as plt
from matplotlib.animation import FuncAnimation
import matplotlib.animation as animation
from matplotlib.pyplot import figure
from matplotlib import style
import locale
from matplotlib.ticker import (MultipleLocator, AutoMinorLocator)
# Set to German locale to get comma decimal separater
locale.setlocale(locale.LC_NUMERIC, "de_DE")
# Tell matplotlib to use the locale we set above
plt.rcParams['axes.formatter.use_locale'] = True

# plt.clf()
# plt.rcdefaults()

# Style und Font definieren

style.use('dark_background')

# Pfeile erstellen
def arrowed_spines(fig, ax):

    xmin, xmax = ax.get_xlim()
    ymin, ymax = ax.get_ylim()

    # removing the default axis on all sides:
    for side in ['bottom','right','top','left']:
        ax.spines[side].set_visible(False)

    # removing the axis ticks
    # plt.xticks([]) # labels
    # plt.yticks([])
    # ax.xaxis.set_ticks_position('none') # tick markers
    # ax.yaxis.set_ticks_position('none')

    # get width and height of axes object to compute
    # matching arrowhead length and width
    dps = fig.dpi_scale_trans.inverted()
    bbox = ax.get_window_extent().transformed(dps)
    width, height = bbox.width, bbox.height

    # manual arrowhead width and length
    hw = 1./20.*(ymax-ymin)
    hl = 1./20.*(xmax-xmin)
    lw = 1. # axis line width
    ohg = 0.3 # arrow overhang

    # compute matching arrowhead length and width
    yhw = hw/(ymax-ymin)*(xmax-xmin)* height/width
    yhl = hl/(xmax-xmin)*(ymax-ymin)* width/height

    # draw x and y axis
    ax.arrow(xmin, 0, xmax-xmin, 0., fc='w', ec='w', lw = lw,
             head_width=hw, head_length=hl, overhang = ohg,
             length_includes_head= True, clip_on = False)

    ax.arrow(0, ymin, 0., ymax-ymin, fc='w', ec='w', lw = lw,
             head_width=yhw, head_length=yhl, overhang = ohg,
             length_includes_head= True, clip_on = False)

# Meine easing-Funktion
def ease(n):
    if n < 0.0:
        return 0
    elif n > 1.0:
        return 1
    else:
        return 3*n**2-2*n**3

# Meine Floor/Warte Funktion
def wait(n):
    if n < 0.0:
        return 0
    else:
        return n

# Canvas erstellen
fig = plt.figure()
ax = fig.add_subplot(111)
fig.set_size_inches([8,9])

def f(x):
    return -0.05*x**2+125
xlin = np.linspace(0,60,100)


# Beschriftung und Optik

plt.xlabel(r"$x$ in $\rm{m}$", horizontalalignment='right', x=1.0)
plt.ylabel(r"$y$ in $\rm{m}$", horizontalalignment='right', y=1.0)
ax.set_xlim(0,100)
ax.set_ylim(0,139)
plt.grid(alpha=.4)
plt.xticks(np.arange(0, 100, 20))
plt.yticks(np.arange(0, 140, 20))
ax.yaxis.set_minor_locator(MultipleLocator(10))
ax.xaxis.set_minor_locator(MultipleLocator(10))
ax.tick_params(axis='x', direction = "inout", length= 10.0, which='both', width=3)
ax.tick_params(axis='y', direction = "inout", length= 10.0, which='both', width=3)


xsub = np.array([0])

# statische Linien definieren
line2, = ax.plot(xsub,f(xsub),linewidth=5,zorder=0,c = 'b')
arrowed_spines(fig, ax)
plt.tight_layout()

# Linien animieren
def animate(i):

    xsub = xlin[0:wait(i-20)]
    global line2
    line2.remove()
    line2, = ax.plot(xsub, f(xsub), linewidth=5, zorder=0,c = "b")
    plt.tight_layout()

animation = FuncAnimation(fig, animate, np.arange(0, 130, 1), interval=100)

plt.show()

# animation.save(r"YOUR\PATH\HERE\reduced_x-y.mov", codec="png",
         dpi=100, bitrate=-1,
         savefig_kwargs={'transparent': True, 'facecolor': 'none'})



  


• python : can't open file 'F :\\Episode Split\\Episode' : [Errno 2] No such file or directory [closed]

  26 février 2024, par Rafa Segovia

  everyone !

  


  I'm trying to write a python script to split a video into parts based on a list of expressions from a docx file, comparing them to the dialogue on an srt file.
I think I have everything installed on my Windows 10 pc.
I keep getting this error.

  


  python : can't open file 'F :\Episode Split\Episode' : [Errno 2] No such file or directory

  


  It's like it detects a space somewhere and stops reading a path.
There's no file called "Episode" anywhere mentioned on the script.
Can you take a look at the script and pinpoint how I can fix this error ?

  


  Thank you

  


  import os
import re
import cv2
import unicodedata
import chardet
from fuzzywuzzy import fuzz
import docx
from bs4 import BeautifulSoup
import xml.etree.ElementTree as ET

# Define variables
expressions_per_cut = 4
max_time_per_cut_seconds = 20
fuzzy_ratio = 60
input_parent_folder = r'F:\Episode Split'
xml_output_folder = r'F:\Episode Split'



  


  I tried removing spaces in the paths by using hyphens among other things.

  


• FFMpeg command line to create specific MPD Manifest

  22 février 2024, par Seth Haberman

  I have tried to get an FFMpeg command to yield the below manifest. Right below is the FFmpeg command that I have tried to make but it has not created the same manifest file as what I am trying to replicate a stream from a third party system to add my own stream to their system so that it will actually play back.

  


  "$ffmpeg_path" \
    -i "$input_file" \
    -r 30000/1001 \
    -vf "scale=3840:1080" \
    -c:v libx265 \
    -c:a aac -b:a 128k \
    -ar 48000 \
    -f dash \
    -use_timeline 1 \
    -use_template 1 \
    -init_seg_name "init-stream\$RepresentationID\$.m4s" \
    -media_seg_name "chunk-stream\$RepresentationID\$-\$Number%05d\$.m4s" \
    -seg_duration 3 \
    "$output_file"


  


  The code above yields a manifest that is structured like below.

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT1M35.1S" maxsegmentduration="PT3.0S" minbuffertime="PT16.8S">&#xA;    <programinformation>&#xA;    </programinformation>&#xA;    <servicedescription>&#xA;    </servicedescription>&#xA;    <period start="PT0.0S">&#xA;        <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30000/1001" maxwidth="3840" maxheight="1080" par="32:9">&#xA;            <representation mimetype="video/mp4" codecs="hev1" bandwidth="2227590" width="3840" height="1080" sar="1:1">&#xA;                <segmenttemplate timescale="30000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                    <segmenttimeline>&#xA;                        <s t="0" d="247247"></s>&#xA;                        <s d="250250" r="9"></s>&#xA;                        <s d="104104"></s>&#xA;                    </segmenttimeline>&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;        <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true">&#xA;            <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="128000" audiosamplingrate="48000">&#xA;                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>&#xA;                <segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                    <segmenttimeline>&#xA;                        <s t="0" d="143360"></s>&#xA;                        <s d="144384" r="29"></s>&#xA;                        <s d="93120"></s>&#xA;                    </segmenttimeline>&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;    </period>&#xA;</mpd>&#xA;&#xA;

  


  The problem is that I I need it to create a stream where the manifest looks like the manifest below. If it doesn't look or function as below, it will not playback correctly on this third parties system.

  


  &lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT1M35.7S" minbuffertime="PT5.9S">&#xA;    <programinformation></programinformation>&#xA;    <period start="PT0.0S">&#xA;        <adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true">&#xA;            <representation bandwidth="12000000" width="3840" height="1080" framerate="30000/1001" mimetype="video/mp4" codecs="hev1">&#xA;                <segmenttemplate media="chunk-stream$RepresentationID$-$Number%05d$.m4s" initialization="init-stream$RepresentationID$.m4s" startnumber="1" timescale="30000">&#xA;                    <segmenttimeline>&#xA;                        <s t="0" d="89089" r="31"></s>&#xA;                        <s d="21021"></s>&#xA;                    </segmenttimeline>&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;        <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true">&#xA;            <representation bandwidth="1536000" audiosamplingrate="48000" mimetype="audio/mp4" codecs="mp4a.40.2">&#xA;                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="16"></audiochannelconfiguration>&#xA;                <segmenttemplate media="chunk-stream$RepresentationID$-$Number%05d$.m4s" initialization="init-stream$RepresentationID$.m4s" startnumber="1" timescale="48000">&#xA;                    <segmenttimeline>&#xA;                        <s t="0" d="143360"></s>&#xA;                        <s d="142336" r="2"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="3"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="3"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="3"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="3"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="3"></s>&#xA;                        <s d="143360"></s>&#xA;                        <s d="142336" r="1"></s>&#xA;                        <s d="32768"></s>&#xA;                    </segmenttimeline>&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;    </period>&#xA;</mpd>&#xA;