Sur d’autres sites (6425)

• ffmpeg duration is not accurate at the result [closed]

  22 octobre 2020, par Veno

  I Got this from Here ! Superuser Example

  


  ffmpeg -f concat -safe 0 -i file.txt -codec copy test.mp4


  


  The Error am Getting is

  


  [...]
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243642, current: 1580032; changing to 479243643. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243643, current: 1580544; changing to 479243644. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243644, current: 1581056; changing to 479243645. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243645, current: 1581568; changing to 479243646. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243646, current: 1582080; changing to 479243647. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243647, current: 1582592; changing to 479243648. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243648, current: 1583104; changing to 479243649. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243649, current: 1583616; changing to 479243650. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243650, current: 1584128; changing to 479243651. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243651, current: 1584640; changing to 479243652. This may result in incorrect timestamps in the output file.
[mp4 @ 0x561235967b00] Non-monotonous DTS in output stream 0:0; previous: 479243652, current: 1585152; changing to 479243653. This may result in incorrect timestamps in the output file.
[...]


  


  Text File Content

  


  file '/home/user/video/Sample01.mp4'
file '/home/user/video/Sample02.mp4'
file '/home/user/video/Sample03.mp4'
file '/home/user/video/Sample04.mp4'
file '/home/user/video/Sample05.mp4'


  


• Animated line chart with pandas, matplotlib and ffmpeg

  10 avril 2020, par Mark K

  In producing an animated line chart, I have below data and codes.

  



  But when the chart produced, it shows no line. What did I do wrong ?

  



  Thank you.

  



  import numpy as np
import pandas as pd
import seaborn as sns
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.animation as animation

title = 'Heroin Overdoses'

data = {'Year' : ["1999","2000","2001","2002","2003","2004","2005","2006","2007","2008","2009","2010","2011","2012","2013","2014","2015","2016"], 
'Heroin Overdoses' : [280,443,413,486,475,148,197,170,448,103,137,160,483,356,352,300,466,278]}
overdose = pd.DataFrame(data)

Writer = animation.writers['ffmpeg']
writer = Writer(fps=20, metadata=dict(artist='Me'), bitrate=1800)

fig = plt.figure(figsize=(10,6))
plt.xlim(1999, 2016)
plt.ylim(np.min(overdose)[0], np.max(overdose)[0])
plt.xlabel('Year',fontsize=20)
plt.ylabel(title,fontsize=20)
plt.title('Heroin Overdoses per Year',fontsize=20)

def animate(i):
    data = overdose.iloc[:int(i+1)] #select data range
    p = sns.lineplot(x=data.index, y=data[title], data=data, color="r")
    p.tick_params(labelsize=17)
    plt.setp(p.lines,linewidth=7)

ani = matplotlib.animation.FuncAnimation(fig, animate, frames=17, repeat=True)

ani.save('C:\\folder\\line chart.mp4', writer=writer)


  


• Graph-based video processing for .NET

  23 octobre 2016, par Borv

  Does anyone know a good object-oriented library (preferably high-level, like C# or Java) for working with video and audio streams ?

  I wrote an app which fiddles with video and audio streams, feeds and such. The original task was simple :

  • grab an RTSP feed
  • display original feed(s) on the display
  • convert it to a series of h264 ts files
  • extract audio into separate MP3 files
  • upload videos and audio to the web site (preferably in real time, few minute delay is acceptable)

  As you may have already guessed it is about recording events (e.g. lectures) and publishing them on the web.

  To pull this out I needed some graph-based non-linear editing for media. Two weeks in, I tried ffmpeg, vlc and WMF. The only library I got to work is ffmpeg, and that comes with lots of "however". WMF required a lot of coding (and I abandoned this path), vlc looked great on paper, but I stumbled across some bugs with input splitting I could not get around (e.g. transcode:es combination flat out refused to work).

  So, the question. What are good non-linear editing libraries besides ffmpeg, vlc and wmf/directshow that allow for building video processing graphs with sources, sinks and filters ? Or perhaps good bindings over ffmpeg and vlc allowing to build such graphs ?