Recherche avancée

Sur d’autres sites (10501)

• FFmpeg - Check if all video files have concatenated correctly into one video

  14 mai 2020, par STerrier

  I am concatenating thousands of .ts files into an mp4 which works great but is there a way to know which files have already been concatenated with FFmpeg ?

  



  The issue I have is I am concatenating multiple videos back to back and if the app is closed off during the concatenation process. The concatenating of the videos may not be complete. I can check if the files exist but the size of the files could be wrong if not all the clips have been concatenated. Is there a way to know if all the files have been concatenated properly ?

  



  My current idea is if the app is closed before it has completed concatenating, I would delete the mp4 file and restart concatenating the video again but this time consuming especially if the files concatenated properly the first time.

  



  Any ideas would be great thanks

  



  ffmpegCommand

  



   ffmpeg -f concat -i \(videoFile) -c:v copy -c:a copy \(outputFile)


  



  I am using the cocoa pod mobile-FFmpeg
https://github.com/tanersener/mobile-ffmpeg

  



  Link to FFmpeg Concatenate function
https://trac.ffmpeg.org/wiki/Concatenate

  


• How to enable hardware support for H.264 encoding on raspberry Pi 4B

  24 mars 2021, par MSD Paul

  I am trying to enable the hardware support for H264 encoding on raspberry pi 4B model. Compiling FFmpeg source enabling the configurations

  



  sudo ./configure --arch=armel --target-os=linux --enable-gpl --enable-omx --enable-omx-rpi --enable-nonfree


  



  following the link, https://github.com/legotheboss/YouTube-files/wiki/(RPi)-Compile-FFmpeg-with-the-OpenMAX-H.264-GPU-acceleration

  



  but while executing the encoding command after building and installing the ffmpeg with those configuration properly, I am getting the following error

  



  [h264_omx @ 0x156b6e0] Using OMX.broadcom.video_encode
[h264_omx @ 0x156b6e0] OMX error 80001000
[h264_omx @ 0x156b6e0] err 80001018 (-2147479528) on line 561
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!


  



  command used :

  



  ffmpeg -i /media/pi/pic_1_org.png -c:v h264_omx -c:a copy -b:v 1500k outputfile.mp4


  



  I just want to encode a single 4K image into a .mp4 file using H.264 encoder. 
Please let me know how to resolve this issue ?

  


• AttributeError while saving an animation using celluloid, Python 3.9

  26 juillet 2021, par rafael gf

  I'm trying to create a simple animation using the celluloid library, but I'm getting an attribute error when trying to save it. I'm not familiar with ffmpeg, but I read I should install it and point to its executable file for the saving to work, not sure what's going wrong. The massage I'm getting is :

  


  Exception has occurred: AttributeError&#xA;type object &#x27;FuncAnimation&#x27; has no attribute &#x27;_first_draw_id&#x27;&#xA; File "C:\Users\Fernando\Documents\Circulos\circulos.py", line 102, in <module>  anim.save(anim, filename="my_animation.gif", writer=FFwriter)&#xA;</module>

  


  I'll out the simplification version of the code below - I'm suppressing the part where I do some tucking with the circles, but I've done some testing plot by plot and it is working fine.

  


  import smtplib, os
import matplotlib.pyplot as plt
from matplotlib import animation
import math
from celluloid import Camera

plt.rcParams['animation.ffmpeg_path'] = os.getcwd() + '\\Circulos\\ffmpeg\\bin\\ffmpeg.exe'


#axes
figure, axes = plt.subplots()
axes.set_aspect(1)
axes.set_xlim((-xmax(C)),(xmax(C)))
axes.set_ylim((-ymax(C)),(ymax(C)))

b = 0

#add initial circles
for a in range 5:
    draw_circle = plt.Circle((a, a), 2, fc = 'None', ec = 'r')
    axes.add_artist(draw_circle)


#create figure and camera
figure, axes = plt.subplots()
axes.set_aspect(1)
axes.set_xlim((-xmax(C)),(xmax(C)))
axes.set_ylim((-ymax(C)),(ymax(C)))
camera = Camera(figure) 

Frame_time = 10

for b in range(Frame_time):

     #add circles
     for a in range 5:
        draw_circle = plt.Circle((a, a), 2, fc = 'None', ec = 'r')
        axes.add_artist(draw_circle)

    #Frame Picture
    camera.snap()


#create animation
anim = camera.animate()
anim = animation.FuncAnimation
FFwriter = animation.FFMpegWriter()
anim.save(anim, filename="my_animation.gif", writer=FFwriter)


  


  I'm working on VS code, the latest version I just updated it, and python 3.9