[FFmpeg-user] How to take perfect screenshots of UHD/HEVC vídeos?

[DopeLabs]

what about using ffmpeg to grab a single frame from the video using -ss to specify the time index?

grab 1 frame at 1 minute into the video

ffmpeg -ss 00:01:00.000 -i input.m2ts -vframes 1 -f image2 screenshot.png

> On Oct 20, 2018, at 8:47 56AM, Kleber Duarte <kdantas at hotmail.com> wrote:
> 
> Hi, could someone give a tip to improve the quality of screenshots taken from UHD HEVC files of seedbox running rtorrent/rutorrent installed on Ubuntu Server Armhf 16.04 "Xenial Xerus" (32bits) OS? Many screenshots are shown without any image definition. I don´t have problem with the screenshots of FHD videos. I don´t know if is necessary any adjust in the lines codes of plugins, or if exist a best way to take screenshots through the terminal SSH?
> 
> I verified that the problem occur with .m2ts UHD files. I tested the screenshot plugin with .mkv UHD files and I didn´t have problems.
> 
> I am running the screenshot plugin from rutorrent gui. So, I don´t have any command or log.
> 
> $ ffmpeg -version
> ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers
> built with gcc 5.3.1 (Ubuntu/Linaro 5.3.1-11ubuntu1) 20160311
> configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
> libavutil 54. 31.100 / 54. 31.100
> libavcodec 56. 60.100 / 56. 60.100
> libavformat 56. 40.101 / 56. 40.101
> libavdevice 56. 4.100 / 56. 4.100
> libavfilter 5. 40.101 / 5. 40.101
> libavresample 2. 1. 0 / 2. 1. 0
> libswscale 3. 1.101 / 3. 1.101​
> libswresample 1. 2.101 / 1. 2.101
> libpostproc 53. 3.100 / 53. 3.100
> 
> [cid:447a8209-bbdc-4ea6-af6f-03a8f590da73]
> [cid:46e34f24-9531-4703-9358-66d538380508]
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