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• Getting Flask to accept chunked encoding

  22 août 2014, par Andrew

  Is it possible to have Python Flask reading chunked encoding sent to it ?

  I have a very simple routine where I want to read the output from ffmpeg -progress which sends progress updates via chunked encoding.

  What happens though is Flask closes the connection after the first POST.

  my routine is very simple

  @app.route('/status', methods=['POST','GET'])
  
  def get_status():
  
      logging.error(request.headers)
  
      logging.error(request.data)
  
      logging.error(request.args)
  
      return "OK"

  What I see in the output is as follows and ffmpeg closes when the POST does

  ERROR:root:Transfer-Encoding: chunked
  
  Content-Length:
  
  User-Agent: Lavf/55.45.100
  
  Connection: close
  
  Host: localhost:50000
  
  Accept: */*
  
  Content-Type:
  
  
  
  
  
  ERROR:root:
  
  ERROR:root:ImmutableMultiDict([])

  Excuse my lazy logging to error. Note in this case I am running Flask in debug mode but otherwise would like to run in Tornado or an equivalent simple container with permissions that make it easy to run command line programs like ffmpeg

• FFMpeg - add sound to video that already contain sound

  24 mars 2016, par jacky brown

  Here is what I have : input1.avi - video that contain sounds. input2.avi - video that doesn’t contain sounds. music.mp3 - audio file.

  I want to add background music(music.mp3 file) to the video.

  C :\input1.avi -i C :\music.mp3 -shortest -c:v copy -c:a copy C :\output1.avi
  then output1.avi is the same as input1 - movie with sounds but without the background music (music.mp3)

  when I try to use the other file (video without sounds) :

  C :\input2.avi -i C :\music.mp3 -shortest -c:v copy -c:a copy C :\output2.avi
  then output2.avi is the same as input2 + it have the background music.

  I tried to execute this too :

  C:\ffmpeg\bin>ffmpeg -i C:\input.avi -i C:\music.mp3 -shortest -c:v copy -filter_ complex "[1]volume=1.5[1a];[0][1a]amerge[a]" -map 0:v -map "[a]" -ac 2 C:\output1.avi

  but got the next error messsage :

  ffmpeg version N-78949-g6f5048f Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
  
  ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
  
  ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
  
  -libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
  
  ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
  
  264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
  
  -lzma --enable-decklink --enable-zlib
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 27.101 / 57. 27.101
  
    libavformat    57. 28.100 / 57. 28.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 39.100 /  6. 39.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'C:\output1.avi':
  
    Metadata:
  
      encoder         : Lavf57.28.100
  
    Duration: 00:02:05.76, start: 0.000000, bitrate: 450 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720
  
  x480 [SAR 1:1 DAR 3:2], 440 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 k
  
  b/s
  
  [mp3 @ 00000000005abc20] Skipping 0 bytes of junk at 32370.
  
  Input #1, mp3, from 'C:\music.mp3':
  
    Metadata:
  
      title           : Broadcast News Package - News Intro
  
      artist          : After Effects News Template
  
    Duration: 00:01:57.89, start: 0.025057, bitrate: 194 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc56.26
  
  [Parsed_amerge_1 @ 0000000000610200] No channel layout for input 1
  
  [Parsed_amerge_1 @ 0000000000610200] No channel layout for input 2
  
  [AVFilterGraph @ 00000000005ddfe0] The following filters could not choose their
  
  formats: Parsed_amerge_1
  
  Consider inserting the (a)format filter near their input or output.
  
  Error configuring complex filters.
  
  I/O error

  So why input1 does not contain the background music ? and how can I decrease or increase the volume of music.mp3 file ?

• FFMPEG fit 1920x1080 video in 1080x1920 video (Instagram Reels)

  10 mars 2021, par tjallo

  I am trying to post a video on Instagram. My current video is 1920x1080, but for Instagram reels it needs to be in 1080x1920 resolution (Basically Vertical). But instead of posting the video on its side, I like to post it with black bars (see image below). But I don't know which transform commands I need to use in ffmpeg to make this work (and also couldn't find any relevant posts).