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• ffmpeg av_read_frame set timeout through callback, How to reduce the frequency of call callback func

  1er décembre 2015, par ICYMYM

  i have set the timeout of av_read_frame, and it work, but i find that the frequency of the call to the callback function is very high, it’s about 15ms every call, is there a way to increase the interval between two calls ? or reduce call frequency of callback function.

  c code like this :

  int timeout_count = 0;
  
  AVFormatContext *pFormatCtx = NULL;
  
  pFormatCtx = avformat_alloc_context();
  
  pFormatCtx->interrupt_callback.callback = interrupt_cb;
  
  pFormatCtx->interrupt_callback.opaque = &timeout_count;
  
  av_dict_set(&opts, "rtsp_transport", "tcp", 0);
  
  
  
  if(avformat_open_input(&pFormatCtx, stream_url, NULL, &opts)!=0)
  
  {
  
    printf("open failed\n");
  
    return -1;
  
  }

  and the callback func code like this :

  static int interrupt_cb(int *timeout_count)
  
  {
  
    (*timeout_count)++;
  
    if(*timeout_count > 500){
  
      return 1;  // timeout 
  
    }
  
    printf("timeout_count:%d\n", (*timeout_count));
  
    return 0;
  
  }

  is there a api to set the interval of call callback func ? thanks very much first !

• avcodec/vvc_mvs : remove an unnecessary AV_ZERO64() call

  24 janvier 2024, par James Almer

  avcodec/vvc_mvs : remove an unnecessary AV_ZERO64() call
  Should fix "member access within misaligned address 0xf00 for type 'const union
  
  av_alias64', which requires 8 byte alignment" errors as reported by GCC ubsan.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/vvc/vvc_mvs.c

• Ffmpeg is installed, but I get the exception : You do not have ffmpeg installed on your machine

  13 janvier 2023, par Tin Kommen

  I've searched for hours for a solution, but I haven't found one yet. Maybe someone here knows what is going wrong.

  


  I'm trying to make a Bar Chart Race in Python. Although I have downloaded and installed Ffmpeg,
I keep on getting multiple errors :

  


      MovieWriter ffmpeg unavailable; using Pillow instead.
    Traceback (most recent call last):
      File "/Users/___/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/matplotlib/animation.py", line 251, in saving
        yield self
      File "/Users/___/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/matplotlib/animation.py", line 1161, in save
        writer.grab_frame(**savefig_kwargs)
      File "/Users/____/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/matplotlib/animation.py", line 549, in grab_frame
        renderer = self.fig.canvas.get_renderer()
    AttributeError: 'FigureCanvasBase' object has no attribute 'get_renderer'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/Users/___/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/bar_chart_race/_make_chart.py", line 435, in make_animation
        ret_val = anim.save(self.filename, fps=self.fps, writer=self.writer)
      File "/Users/___/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/matplotlib/animation.py", line 1161, in save
        writer.grab_frame(**savefig_kwargs)
      File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/contextlib.py", line         100, in __exit__
        self.gen.throw(type, value, traceback)
      File "/Users/___/PycharmProjects/data_visualization/venv/lib/python3.6/site-                        packages/matplotlib/animation.py", line 253, in saving
        self.finish()
              File "/Users/____/PycharmProjects/data_visualization/venv/lib/python3.6/site-        packages/matplotlib/animation.py", line 554, in finish
        self._frames[0].save(
            IndexError: list index out of range

    During handling of the above exception, another exception occurred:

    Exception: You do not have ffmpeg installed on your machine. Download
    ffmpeg from here: https://www.ffmpeg.org/download.html.
    Matplotlib's original error message below:
    list index out of range


  


  I've tried installing ffmpeg with conda, pip and homebrew. When I check the version, i get the following :

  


      ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
      built with clang version 9.0.1
      configuration: --prefix=/Users/___/opt/miniconda3 --cc=x86_64-apple-darwin13.4.0-clang --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-libx264 --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame
      libavutil      56. 31.100 / 56. 31.100
      libavcodec     58. 54.100 / 58. 54.100
      libavformat    58. 29.100 / 58. 29.100
      libavdevice    58.  8.100 / 58.  8.100
      libavfilter     7. 57.100 /  7. 57.100
      libavresample   4.  0.  0 /  4.  0.  0
      libswscale      5.  5.100 /  5.  5.100
      libswresample   3.  5.100 /  3.  5.100
      libpostproc    55.  5.100 / 55.  5.100


  


  Here is the code :

  


      import numpy as np
    import pandas as pd
    import bar_chart_race as bcr
    import os



    df = pd.read_csv('/Users/____/Documents/data/dummy_data.csv', delimiter=';', encoding="utf-8-sig")
    bcr.bar_chart_race(
        df=df,
        filename='test_win2.mov',
        orientation='h',
        sort='desc',
        n_bars=8,
        fixed_order=False,
        fixed_max=False,
        steps_per_period=50,
        interpolate_period=False,
        label_bars=True,
        bar_size=.95,
        period_label={'x': .99, 'y': .25, 'ha': 'right', 'va': 'center'},
        period_summary_func=lambda v, r: {'x': .99, 'y': .18,
                                  's': f'Totaal: {v.nlargest(8).sum():,.0f}',
                                  'ha': 'right', 'size': 8, 'family': 'Courier New'},
        perpendicular_bar_func='median',
        figsize=(3.5, 3),
        period_length=100,
        dpi=300,
        cmap='dark12',
        title='Title?',
        title_size='',
        bar_label_size=4,
        tick_label_size=4,
        shared_fontdict={'family': 'Helvetica', 'color': '.1'},
        scale='linear',
        writer=None,
        fig=None,
        bar_kwargs={'alpha': .3},
        filter_column_colors=False)