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• trying to efficiently extract images from h264 stream [closed]

  16 avril 2013, par Charlie

  I have a webcam (Logitech C920) that can generate H.264 stream. I want to encode it into HTTP Live Streaming (HLS) AND extract out 'thumbnail' images about once a second.

  I have a command that will generate the HLS by itself with the following :

  /home/root/develop/capture/capture -c -1 -o |
    ffmpeg -y -r 30 -i - -vcodec copy -f segment -segment_list prog_index.m3u8 \
    -segment_list_flags +live -segment_time 2 -map 0 -segment_wrap 4 \
    -segment_format mpegts out%03d.ts
  

  However, when I add in the 'thumbnail' processing, I end up dropping to 12 fps.

  I used the same command and then added :

  -r 1 -f image2  -updatefirst 1 thumbnail.jpeg 

  Is there any way to improve the performance of the image extraction ?

• Unrecognized option '-enable-libx264'. Error splitting the argument list : Option not found

  9 mars 2020, par DigM

  I’m trying to stream MP4 videos from my server to YouTube and so I installed FFMPEG version. When I then look at the configuration of FFMPEG, I am then presented with the following :

  ffmpeg version 3.3.6 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --enable-cross-compile --arch=i686 --target-os=linux --disable-yasm --disable-static --enable-shared --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libsoxr --enable-version3 --enable-nonfree --enable-openssl --disable-decoder=ac3 --disable-decoder=ac3_fixed --disable-decoder=eac3 --disable-decoder=dca --disable-decoder=truehd --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-encoder=dca --disable-decoder=hevc --disable-decoder=hevc_cuvid --disable-encoder=hevc_nvenc --disable-encoder=nvenc_hevc --extra-ldflags='-L/root/daily_build/64_05/4.4.1/LinkFS/usr/lib -L/root/daily_build/64_05/4.4.1/Model/TS-X72/build/RootFS/usr/local/medialibrary/lib -Wl,--rpath -Wl,/usr/local/medialibrary/lib' --extra-cflags='-I/root/daily_build/64_05/4.4.1/LinkFS/usr/include -I/root/daily_build/64_05/4.4.1/Model/TS-X72/build/RootFS/usr/local/medialibrary/include -D_GNU_SOURCE -DQNAP' --prefix=/root/daily_build/64_05/4.4.1/Model/TS-X72/build/RootFS/usr/local/medialibrary
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100

  However, when I then try

  ffmpeg ---enable-libx264

  I then get an error saying :

  Unrecognized option '--enable-libx264'.
  
  Error splitting the argument list: Option not found

  Do I need to change the configuaration of FFMPEG somehow or run another configuration option first or is there just something wrong with my call to enable libx264 ?

• ffmpeg not working if run from py2app

  28 juin 2018, par dprogramz

  I’m trying to build a simple app that concats 2 mp4 files. It works fine if I run it from the command line, but if I run it from py2app app it doesn’t work. If I run the app from within the py2app in the console (eg ’dist/addTag.app/Contents/MacOS/addTag’), it works fine. It only doesn’t work if i run the app by double clicking on it. Any ideas ? code below

  #! /usr/bin/python
  
  import argparse
  
  import ffmpeg
  
  import os
  
  import shutil
  
  import sys
  
  from Tkinter import *
  
  import time
  
  
  
  fields = 'Input Video', 'Tag Video', 'Output Name'
  
  
  
  def fetch(entries, bu, lb, rt):
  
      bu['state'] = 'disabled'
  
      lb['text'] = 'working'
  
      rt.update()
  
      ffmpeg.concat(ffmpeg.input(entries[0][1].get()), ffmpeg.input(entries[1][1].get())).output(os.path.expanduser("~/desktop/")+entries[2][1].get()).run()
  
      bu['state'] = 'normal'
  
      lb['text'] = 'Ready'
  
      rt.update()
  
  
  
  
  
  def makeform(root, fields):
  
     entries = []
  
     for field in fields:
  
        row = Frame(root)
  
        lab = Label(row, width=15, text=field, anchor='w')
  
        ent = Entry(row)
  
        row.pack(side=TOP, fill=X, padx=5, pady=5)
  
        lab.pack(side=LEFT)
  
        ent.pack(side=RIGHT, expand=YES, fill=X)
  
        entries.append((field, ent))
  
     return entries
  
  
  
  if __name__ == '__main__':
  
     root = Tk()
  
     root.title("Video Maker")
  
     ents = makeform(root, fields)
  
     root.bind('<return>', (lambda event, e=ents: fetch(e))) 
  
     label = Label(root, text="Ready")
  
     label.pack(side=LEFT)  
  
     b1 = Button(root, text='Make Video',
  
            command=(lambda e=ents: fetch(e, b1, label, root)))
  
     b1.pack(side=LEFT, padx=5, pady=5)
  
     b2 = Button(root, text='Quit', command=root.quit)
  
     b2.pack(side=LEFT, padx=5, pady=5)
  
  
  
     root.mainloop()
  
  </return>