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• 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)


  


• ffmpeg converting mp4 to gif with color palette results in truncated video

  6 décembre 2019, par Tik0

  I want to generate a gif from my mp4 movie with ffmpeg (ffmpeg version 2.8.15-0ubuntu0.16.04.1) using a color palette. Everything works fine if I do not use a palette :

  $ ffmpeg -i in.mp4 -filter_complex "scale=160:-1" out.gif
  
  ...
  
  frame= 2003 fps=251 q=-0.0 Lsize=   21172kB time=00:01:20.12 bitrate=2164.7kbits/s    
  
  video:21155kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.077667%

  But using a palette like so results in Buffer queue overflow, dropping messages and a truncated video

  $ ffmpeg -i in.mp4 -filter_complex "[0:v] scale=160:-1, split [a][b];[a] palettegen [p];[b][p] paletteuse" out.gif
  
  ....
  
  [Parsed_paletteuse_3 @ 0xc56de0] [framesync @ 0xd1af08] Buffer queue overflow, dropping.
  
  Last message repeated 36 times
  
  [Parsed_paletteuse_3 @ 0xc56de0] [framesync @ 0xd1af08] Buffer queue overflow, dropping.
  
  Last message repeated 106 times
  
  ...
  
  [Parsed_palettegen_2 @ 0xc56d40] 255(+1) colors generated out of 1347441 colors; ratio=0.000189
  
  frame=   65 fps=5.4 q=-0.0 Lsize=    1036kB time=00:01:20.12 bitrate= 105.9kbits/s    
  
  video:1035kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.124664%