Win10 自带的 xbox 的录屏功能似乎不支持 4K，可以使用 Nvidia GeForce Experience 录制 4K 分辨率的游戏视频，快捷键为 ALT+F9。录制完成之后，可以用 FFmpeg 来处理视频。本文记录截取，合并等常用操作的命令参数。
截取视频：
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ffmpeg.exe -ss 00:00:11 -t 00:02:10 -accurate_seek -i orig2.mp4 -codec copy -avoid_negative_ts 1 1.mp4 ffmpeg.exe -ss 00:13:52 -t 00:00:15 -accurate_seek -i orig.mp4 -codec copy -avoid_negative_ts 1 2.mp4 ffmpeg.exe -ss 00:24:54 -t 00:00:32 -accurate_seek -i orig.mp4 -codec copy -avoid_negative_ts 1 3.mp4 ffmpeg.exe -ss 00:27:54 -t 00:02:28 -accurate_seek -i orig.mp4 -codec copy -avoid_negative_ts 1 4.mp4 |
视频信息
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ffprobe -print_format json -show_streams video.mp4 2>/dev/null | jq . |
转场图片
创建黑色背景，分辨率为 3840x2160 的图片，右键图片，选择创建新视频，使用 win10 自带工具创建开头视频。
创建完成之后转换为 4k 分辨率，并和 GeForce Experience 的参数保持一致，否则会出现视频音频不同步的问题。
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$ ffmpeg -i 1.mp4 2>&1|grep tbn Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 3840x2160 [SAR 1:1 DAR 16:9], 22827 kb/s, 6 fps, 60 tbr, 90k tbn, 120 tbc (default) # 使用 90k tbn $ ffmpeg.exe -i start.mp4 -s 3840x2160 -r 60 -video_track_timescale 90k start-4k.mp4 |
参考：https://stackoverflow.com/questions/15931437/ffmpeg-how-to-control-fps-tbr-tbn-tbc-parameters
合并视频
创建视频列表文件 list.txt，内容为
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file start-4k.mp4 file 1.mp4 file 2.mp4 file 3.mp4 file 4.mp4 |
然后执行命令
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$ ffmpeg.exe -f concat -i list.txt -c copy new.mp4 |
压缩
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$ ffmpeg.exe -i new.mp4 -r 30 -vf scale=-2:1080 new-1080p.mp4 $ ffmpeg.exe -i new-1080p.mp4 ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 9.2.0 (Rev2, Built by MSYS2 project) configuration: --prefix=/mingw64 --target-os=mingw32 --arch=x86_64 --disable-debug --disable-static --enable-dxva2 --enable-d3d11va --enable-fontconfig --enable-gnutls --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libcaca --enable-libcelt --enable-libfreetype --enable-libgsm --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libspeex --enable-libsrt --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-libvpx --enable-libwebp --enable-openal --enable-libwavpack --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-static --enable-swresample --enable-version3 --enable-zlib --disable-doc libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'new-1080p.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Duration: 00:02:52.90, start: 0.000000, bitrate: 2865 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2725 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler At least one output file must be specified $ du -sh new* 688M new.mp4 60M new-1080p.mp4 |
脚本
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#!/bin/bash function _help() { echo "command" echo -e "\t split | merge | transition | compress" echo "param" echo -e "\t-f split or merge data file" echo -e "\t-i input video file" echo -e "\t-h help" exit 1 } # 获取前缀 function _prefix() { [ "$DATA"x == ""x ] && _help PREFIX=`echo $DATA |cut -f1 -d'.'` } function _checkInput() { [ "$INPUT"x == ""x ] && _help FORMAT=`echo $INPUT |awk -F'.' '{print $NF}'` NAME=`echo $INPUT |awk -F'.' '{print $1}'` } # 将使用win10 创建的转场动画转为 4k 分辨率，和 GeForce Experience 保持一致 function _transition() { _checkInput ffmpeg.exe -y -i $INPUT -s 3840x2160 -r 60 -video_track_timescale 90k $NAME-4k.$FORMAT } # DATA 格式 # 开始时间 持续时长，如： # 00:00:00 00:00:10 function _split() { _checkInput _prefix [ ! -d $PREFIX ] && mkdir $PREFIX echo -n "" > $PREFIX/list.txt # 保证数据文件结尾换行 cp $DATA $PREFIX/tmp.txt echo "" >> $PREFIX/tmp.txt ID=1 while read line;do START=`echo $line |awk '{print $1}'` LENGTH=`echo $line |awk '{print $2}'` [ "$START"x == ""x ] && continue ffmpeg.exe -y -ss $START -t $LENGTH -accurate_seek -i $INPUT -codec copy -avoid_negative_ts 1 $PREFIX/$ID.$FORMAT echo "file $ID.$FORMAT" >> $PREFIX/list.txt ((ID=ID+1)) done < $PREFIX/tmp.txt rm -f $PREFIX/tmp.txt } function _merge() { _prefix FORMAT=`head -n1 $DATA |awk -F'.' '{print $NF}'` ffmpeg.exe -y -f concat -i $DATA -c copy $PREFIX-merge.$FORMAT } function _compress() { _checkInput ffmpeg.exe -y -i $INPUT -r 30 -vf scale=-2:1080 $NAME-1080p.$FORMAT ffmpeg.exe -y -i $INPUT -r 30 -vf scale=-2:720 $NAME-720p.$FORMAT } COMMAND=$1 for i in "$@" do key=$1 case $key in -f) DATA=$2; shift 2;; -i) INPUT=$2; shift 2;; -h) _help;; *) shift;; esac done # 功能 case $COMMAND in "split") _split;; "transition") _transition;; "merge") _merge;; "compress") _compress;; *) _help;; esac |
插入音频
ffmpeg -i input.mp4 -i input.mp3 -c copy -map 0:v:0 -map 1:a:0 output.mp4
https://superuser.com/questions/590201/add-audio-to-video-using-ffmpeg