问题描述
我正在使用以下命令使用叠加层在视频之间添加转场效果，以便当一个视频即将结束时，叠加层变得可见。在显示叠加层之前，我必须添加填充和连接视频，使它们成为单个视频，然后显示叠加层。
ffmpeg
-i input1.mp4
-i input2.mp4
-i input3.mp4
-i transition1.mp4
-i transition2.mp4
-filter_complex
"[0:v]pad=width=1080:height=1920:x=(1080-iw)*0.5:y=(1920-ih)*0.5:color=black[video0];
[1:v]pad=width=1080:height=1920:x=(1080-iw)*0.5:y=(1920-ih)*0.5:color=black[video1];
[2:v]pad=width=1080:height=1920:x=(1080-iw)*0.5:y=(1920-ih)*0.5:color=black[video2];
[video0][video1][video2]concat=n=3:v=1:a=0[outv];
[3:v]colorkey=0x00d800:0.1[t0];
[t0]scale=w=1080:h=1920[tr0];
[4:v]colorkey=0x00d800:0.1[t1];
[t1]scale=w=1080:h=1920[tr1];
[outv][tr0]overlay=0:0:enable='between(t\,7\,9)'[out0];
[out0][tr1]overlay=0:0:enable='between(t\,12\,15)'[out1];
[0:a][1:a][2:a]concat=n=3:v=0:a=1[audio]"
-vsync 0 -c:v libx264 -pix_fmt yuv420p -map [out1] -map [audio] -preset ultrafast output.mp4
但是上述命令不会显示任何重叠视频。如果我从覆盖参数中删除enable = between（t，start，end），则所有覆盖都会在视频开始时显示。我是视频编辑和FFMpeg的初学者。有人可以指导我在这里做错什么吗？
这是控制台中的日志：
ffmpeg version v4.4-dev-416
I/mobile-ffmpeg: copyright (c) 2000-2020 the FFmpeg developers
built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolBox --disable-audiotoolBox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec
libavutil 56. 55.100 / 56. 55.100
libavcodec 58. 96.100 / 58. 96.100
libavformat 58. 48.100 / 58. 48.100
libavdevice 58. 11.101 / 58. 11.101
libavfilter 7. 87.100 / 7. 87.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
I/mobile-ffmpeg: Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'input1.mp4':
Metadata:
major_brand :
mp42
minor_version :
0
compatible_brands:
isommp42
creation_time :
2020-08-12T17:21:49.000000Z
com.android.version:
9
Duration:
I/mobile-ffmpeg: 00:00:08.12,start:
0.000000,bitrate:
17298 kb/s
Stream #0:0
(eng)
: Video: h264 (avc1 / 0x31637661),yuv420p(tv,bt709),1920x1080,16309 kb/s,SAR 1:1 DAR 16:9,28.70 fps,29.50 tbr,90k tbn,60 tbc
(default)
Metadata:
rotate :
90
creation_time :
2020-08-12T17:21:49.000000Z
handler_name :
VideoHandle
Side data:
displaymatrix: rotation of -90.00 degrees
Stream #0:1
I/mobile-ffmpeg: (eng)
: Audio: aac (mp4a / 0x6134706D),48000 Hz,stereo,fltp,192 kb/s
(default)
Metadata:
creation_time :
2020-08-12T17:21:49.000000Z
handler_name :
SoundHandle
I/mobile-ffmpeg: Input #1,from 'input2.mp4':
Metadata:
major_brand :
isom
minor_version :
512
compatible_brands:
isomiso2avc1mp41
encoder :
Lavf57.25.100
I/mobile-ffmpeg: Duration:
00:00:05.97,bitrate:
770 kb/s
Stream #1:0
(und)
: Audio: aac (mp4a / 0x6134706D),22050 Hz,128 kb/s
(default)
Metadata:
handler_name :
SoundHandler
Stream #1:1
(und)
: Video: h264 (avc1 / 0x31637661),yuv420p,368x480,608 kb/s,27.29 fps,I/mobile-ffmpeg: 120 tbr,12k tbn,60 tbc
(default)
Metadata:
handler_name :
VideoHandler
I/mobile-ffmpeg: Input #2,from 'input3.mp4':
Metadata:
major_brand :
isom
minor_version :
512
compatible_brands:
isomiso2avc1mp41
I/mobile-ffmpeg: encoder :
Lavf55.19.104
Duration:
00:00:13.05,bitrate:
2453 kb/s
Chapter #2:0:
start 0.000000,end 13.033000
Metadata:
title :
Stream #2:0
(und)
: Audio: aac (mp4a / 0x6134706D),44100 Hz,128 kb/s
(default)
I/mobile-ffmpeg: Metadata:
handler_name :
SoundHandler
Stream #2:1
(und)
: Video: h264 (avc1 / 0x31637661),640x480,2320 kb/s,25 fps,25 tbr,1200k tbn,50 tbc
(default)
Metadata:
handler_name :
VideoHandler
Stream #2:2
(eng)
: Data: bin_data (text / 0x74786574),0 kb/s
I/mobile-ffmpeg: Metadata:
handler_name :
SubtitleHandler
I/mobile-ffmpeg: Input #3,from 'transition1.mp4':
Metadata:
major_brand :
mp42
minor_version :
0
I/mobile-ffmpeg: compatible_brands:
mp41isom
creation_time :
2020-08-17T09:24:04.000000Z
Duration:
00:00:02.22,bitrate:
2445 kb/s
Stream #3:0
(und)
: Video: h264 (avc1 / 0x31637661),1920x1080 [SAR 1:1 DAR 16:9],2414 kb/s,30 fps,30 tbr,30k tbn,60 tbc
(default)
I/mobile-ffmpeg: Metadata:
creation_time :
2020-08-17T09:24:04.000000Z
handler_name :
VideoHandler
encoder :
AVC Coding
Stream #3:1
(und)
: Audio: aac (mp4a / 0x6134706D),79 kb/s
(default)
Metadata:
creation_time :
I/mobile-ffmpeg: 2020-08-17T09:24:04.000000Z
handler_name :
I/mobile-ffmpeg: SoundHandler
I/mobile-ffmpeg: Input #4,from 'transition2.mp4':
Metadata:
major_brand :
mp42
minor_version :
0
compatible_brands:
mp41isom
creation_time :
2020-08-17T09:21:33.000000Z
Duration:
00:00:02.22,bitrate:
2331 kb/s
I/mobile-ffmpeg: Stream #4:0
(und)
: Video: h264 (avc1 / 0x31637661),2298 kb/s,60 tbc
(default)
Metadata:
creation_time :
2020-08-17T09:21:33.000000Z
handler_name :
VideoHandler
encoder :
AVC Coding
Stream #4:1
(und)
I/mobile-ffmpeg: : Audio: aac (mp4a / 0x6134706D),79 kb/s
(default)
Metadata:
creation_time :
2020-08-17T09:21:33.000000Z
handler_name :
SoundHandler
I/mobile-ffmpeg: Stream mapping:
Stream #0:0 (h264) -> pad
Stream #0:1 (aac) -> concat:in0:a0
Stream #1:0 (aac) -> concat:in1:a0
Stream #1:1 (h264) -> pad
Stream #2:0 (aac) -> concat:in2:a0
Stream #2:1 (h264) -> pad
Stream #3:0 (h264) -> colorkey
Stream #4:0 (h264) -> colorkey
I/mobile-ffmpeg: overlay
-> Stream #0:0 (libx264)
concat
-> Stream #0:1 (aac)
Press [q] to stop,[?] for help
W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0x73485c3fc0] sws_param option is deprecated and ignored
[graph 0 input from stream 1:1 @ 0x73485c4140] sws_param option is deprecated and ignored
[graph 0 input from stream 2:1 @ 0x73485c4200] sws_param option is deprecated and ignored
[graph 0 input from stream 3:0 @ 0x73485c42c0] sws_param option is deprecated and ignored
W/mobile-ffmpeg: [graph 0 input from stream 4:0 @ 0x73485c4380] sws_param option is deprecated and ignored
W/mobile-ffmpeg: [swscaler @ 0x7324db9000] No accelerated colorspace conversion found from yuv420p to argb.
W/mobile-ffmpeg: [swscaler @ 0x7324876000] No accelerated colorspace conversion found from yuv420p to argb.
I/mobile-ffmpeg: [libx264 @ 0x7332f9a500] using SAR=1/1
W/mobile-ffmpeg: [libx264 @ 0x7332f9a500] MB rate (8160000000) > level limit (16711680)
I/mobile-ffmpeg: [libx264 @ 0x7332f9a500] using cpu capabilities: ARMv8 NEON
I/mobile-ffmpeg: [libx264 @ 0x7332f9a500] profile Constrained Baseline,level 6.2,4:2:0,8-bit
[libx264 @ 0x7332f9a500] 264 - core 160 - H.264/MPEG-4 AVC codec - copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
I/mobile-ffmpeg: Output #0,to 'output.mp4':
Metadata:
I/mobile-ffmpeg: major_brand :
mp42
minor_version :
0
compatible_brands:
isommp42
com.android.version:
9
encoder :
Lavf58.48.100
Chapter #0:0:
start 0.000000,end 13.033000
Metadata:
title :
Stream #0:0
I/mobile-ffmpeg: : Video: h264 (libx264) (avc1 / 0x31637661),yuv420p(progressive),1080x1920 [SAR 1:1 DAR 9:16],q=-1--1,1000k tbn,1000k tbc
(default)
Metadata:
encoder :
Lavc58.96.100 libx264
Side data:
cpb:
bitrate max/min/avg: 0/0/0 buffer size: 0
vbv_delay: N/A
Stream #0:1
: Audio: aac (mp4a / 0x6134706D),128 kb/s
(default)
Metadata:
I/mobile-ffmpeg: encoder :
Lavc58.96.100 aac
E/Progress: Progress: 3.6918316
D/mobile-ffmpeg: Progress: frame: 1,time: 1002,Pct: 0.036918
I/mobile-ffmpeg: frame= 1 fps=0.0 q=0.0 size= 0kB time=00:00:01.00 bitrate= 0.5kbits/s speed=1.13x
解决方法
叠加层过滤器通过时间戳同步两个输入，因此叠加层视频的第二个X被打印在主视频的第二个X的顶部。因此，使用overlay=0:0:enable='between(t\,7\,9)'的arg，ffmpeg首先要在时间戳为7.00的主视频上覆盖时间戳为7.00的叠加帧。如果覆盖视频的时间不长，则不会有任何效果。
需要修改叠加视频的时间戳，以创建所需的同步。
[3:v]colorkey=0x00d800:0.1,scale=w=1080:h=1920,setpts=PTS-STARTPTS+7/TB[tr0];
设定值将第一个转换流转换为从时间戳7开始。现在可以用enable='between(t\,9)'覆盖。