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• difference overlay filter ffmpeg like photoshop/affinity photo

  14 janvier, par Owen Quinlan

  In photoshop and affinity photo there is a nice overlay filter that basically subtracts the overlaying layer from the one bellow to make a "difference map"

  


  Example :
Base image :
Screenshot Mario Kart 1

  


  Overlaying image :
Screenshot Mario Kart 2

  


  Resulting output :
Diff from two screenshots

  


  This is an example diff of overlaying a PNG with a JpegXL(I think) compressed image and then brightened :
Diff generated from image compression

  


  Location of filter in photoshop :
Photoshop screenshot

  


  Is there anyway to accomplish this with a filter in ffmpeg for an entire video ?

  


• Flutter chewie video player shows incorrect duration for HLS stream

  29 mai 2022, par magackame

  Im using SRS and ffmpeg to create a HLS video stream
  
I run SRS using docker command

  


  docker run --rm -it -p 1935:1935 -p 1985:1985 -p 8080:8080 ossrs/srs:4 ./objs/srs -c conf/docker.conf


  


  And then post a stream using ffmpeg command

  


  ffmpeg -re -i video.mp4 -c copy -f flv rtmp://localhost/live/livestream


  


  To playback a video in flutter I use Chewie video player (chewie: ^1.3.2 in pubspec.yaml) and this widget code :

  


  import &#x27;package:video_player/video_player.dart&#x27;;&#xA;import &#x27;package:chewie/chewie.dart&#x27;;&#xA;import &#x27;package:flutter/material.dart&#x27;;&#xA;&#xA;class RoomView extends StatefulWidget {&#xA;  const RoomView({Key? key}) : super(key: key);&#xA;&#xA;  @override&#xA;  _RoomViewState createState() => _RoomViewState();&#xA;}&#xA;&#xA;class _RoomViewState extends State<roomview> {&#xA;  late VideoPlayerController _videoController;&#xA;  late ChewieController _controller;&#xA;&#xA;  @override&#xA;  void dispose() {&#xA;    _controller.dispose();&#xA;    _videoController.dispose();&#xA;&#xA;    super.dispose();&#xA;  }&#xA;&#xA;  @override&#xA;  void initState() {&#xA;    super.initState();&#xA;&#xA;    _videoController = VideoPlayerController.network(&#x27;http://localhost/live/livestream.m3u8&#x27;)&#xA;      ..initialize().then((_) {&#xA;        setState(() {});&#xA;      });&#xA;&#xA;    _controller = ChewieController(videoPlayerController: _videoController);&#xA;  }&#xA;&#xA;  @override&#xA;  Widget build(BuildContext context) {&#xA;    return AspectRatio(&#xA;        aspectRatio:&#xA;        _controller.aspectRatio == null ? 16 / 9 : _controller.aspectRatio!,&#xA;        child: Chewie(controller: _controller));&#xA;  }&#xA;}&#xA;</roomview>

  


  The video plays fine and seeking using the playback bar also works, but the video duration is incorrect. I tried streaming videos with different duration(the two minute and twenty minute ones), tried using mp4 and mkv formats as source and/or streaming using mpegts as output container(instead of flv) but all of them had a duration of either one minute or sometimes 10 seconds and the playbar will overflow when reaching the limit(showing something like 2:11/1:05).
  
When playing some public HLS streams(https://multiplatform-f.akamaihd.net/i/multi/will/bunny/big_buck_bunny_,640x360_400,640x360_700,640x360_1000,950x540_1500,.f4v.csmil/master.m3u8) the video duration is shown correctly so I guess the problem is either the SRS or the ffmpeg.
  
The question is what am I doing wrong, what parameters should I use for ffmpeg or SRS, and what are other options that I can use to provide a working HLS stream for the player

  


• FFMPEG hangs (sometimes) when trying to take a photo from USB camera ?

  13 mai 2022, par dezman

  I am attempting to write a script that takes a photo every 3 seconds from camera source "1", the -pix_fmt I think is unique to my USB camera.

  


  Here is the script :

  


  #!/bin/bash

set -e

while :
do
  nice_num=$(date +%s)
  
  ffmpeg -ss 00:00:00 -f avfoundation -pix_fmt yuyv422 -r 30.000030 -i "1" -t 1 -frames:v 1 -q:v 2 "image_$nice_num_%03d.jpg"
  
  wait

  sleep 3
done


  


  The issue is half the time it successfully takes the photo, and half the time it just hangs forever echoing this (not useful) :

  


  ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.0.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100


  


  Then I CTRL-C 3 times and get :

  


  ^C^C^CReceived > 3 system signals, hard exiting


  


  Other methods of "taking a photo every n seconds from bash" are also appreciated.