https://bugs.kde.org/show_bug.cgi?id=430266
--- Comment #27 from Philippe ROUBACH <philippe.roub...@free.fr> ---
I extract with no problem an icon from a mp4 video
ffmpeg -i file.mp4 -vf "thumbnail,scale=640:360" -frames:v 1 thumb.png
ffmpeg version 3.4.8 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (SUSE Linux)
configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
--incdir=/usr/include/ffmpeg --extra-cflags='-fmessage-length=0
-grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong
-funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g'
--optflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall
-D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables
-fasynchronous-unwind-tables -fstack-clash-protection -g' --disable-htmlpages
--enable-pic --disable-stripping --enable-shared --disable-static --enable-gpl
--disable-openssl --enable-avresample --enable-libcdio --enable-gnutls
--enable-ladspa --enable-libass --enable-libbluray --enable-libcelt
--enable-libcdio --enable-libdc1394 --enable-libfreetype --enable-libgsm
--enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse
--enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libzimg
--enable-libzvbi --enable-vaapi --enable-vdpau --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-version3 --enable-libx264 --enable-libx265
--enable-libxvid
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : CLIP PHARAMOND 1957
encoder : Lavf58.20.100
Duration: 00:01:40.15, start: 0.000000, bitrate: 669 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480
[SAR 1:1 DAR 4:3], 533 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'thumb.png':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : CLIP PHARAMOND 1957
encoder : Lavf57.83.100
Stream #0:0(und): Video: png, rgb24, 640x360 [SAR 3:4 DAR 4:3], q=2-31, 200
kb/s, 30 fps, 30 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc57.107.100 png
[Parsed_thumbnail_0 @ 0x561bac0fbe20] frame id #52 (pts_time=1.733333) selected
from a set of 100 images
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A dup=1 drop=1
speed=0.135x
video:263kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
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