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• Artifact while streaming multicast with ffmpeg

  17 août 2018, par Nicosmik

  Locally, from my windows machine with ffmpeg 3.3.2 from Zeranoe

  ffmpeg version 3.2.2 Copyright (c) 2003-2016 the FFmpeg developers
  built with gcc 5.4.0 (GCC)
  configuration : —enable-gpl
  —enable-version3 —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-decklink —enable-zlib

  Server side

  Launch udp multicast streaming.

   ffmpeg -re -i video.ts -an -f mpegts -c copy udp://224.1.1.1:5000

  Client side

  Playing with ffplay is correct, no artifacts displayed

  ffplay udp://224.1.1.1:5000

  Playing after decoding cause artifacts

  ffmpeg -i udp://224.1.1.1:5000 -pix_fmt gray -f avi - | ffplay -

  or

  ffmpeg -f mpegts -i udp://224.1.1.1:5000 -pix_fmt gray -c:v rawvideo -f avi out.avi

  Does someone has an explanation ?

• aarch64 : hevc : Produce epel_uni_w_hv functions for both neon and i8mm

  20 mars 2024, par Martin Storsjö

  aarch64 : hevc : Produce epel_uni_w_hv functions for both neon and i8mm
  AWS Graviton 3 :
  
  put_hevc_epel_uni_w_hv4_8_c : 191.2
  
  put_hevc_epel_uni_w_hv4_8_neon : 87.7
  
  put_hevc_epel_uni_w_hv4_8_i8mm : 83.2
  
  put_hevc_epel_uni_w_hv6_8_c : 349.5
  
  put_hevc_epel_uni_w_hv6_8_neon : 153.0
  
  put_hevc_epel_uni_w_hv6_8_i8mm : 148.5
  
  put_hevc_epel_uni_w_hv8_8_c : 581.2
  
  put_hevc_epel_uni_w_hv8_8_neon : 166.7
  
  put_hevc_epel_uni_w_hv8_8_i8mm : 163.5
  
  put_hevc_epel_uni_w_hv12_8_c : 1230.0
  
  put_hevc_epel_uni_w_hv12_8_neon : 387.7
  
  put_hevc_epel_uni_w_hv12_8_i8mm : 370.2
  
  put_hevc_epel_uni_w_hv16_8_c : 2003.2
  
  put_hevc_epel_uni_w_hv16_8_neon : 501.5
  
  put_hevc_epel_uni_w_hv16_8_i8mm : 490.2
  
  put_hevc_epel_uni_w_hv24_8_c : 4448.7
  
  put_hevc_epel_uni_w_hv24_8_neon : 1092.2
  
  put_hevc_epel_uni_w_hv24_8_i8mm : 1069.7
  
  put_hevc_epel_uni_w_hv32_8_c : 7817.2
  
  put_hevc_epel_uni_w_hv32_8_neon : 1916.2
  
  put_hevc_epel_uni_w_hv32_8_i8mm : 1829.5
  
  put_hevc_epel_uni_w_hv48_8_c : 16728.2
  
  put_hevc_epel_uni_w_hv48_8_neon : 4263.7
  
  put_hevc_epel_uni_w_hv48_8_i8mm : 4342.7
  
  put_hevc_epel_uni_w_hv64_8_c : 29563.2
  
  put_hevc_epel_uni_w_hv64_8_neon : 7474.2
  
  put_hevc_epel_uni_w_hv64_8_i8mm : 7128.5
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/hevcdsp_epel_neon.S
  • [DH] libavcodec/aarch64/hevcdsp_init_aarch64.c

• 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)