我能够将两个视频合并成一个并排叠加的视频，并且能够提高电影的帧速率，但我无法弄清楚如何同时完成这两项操作。我尝试了以下方法。
ffmpeg -i gp1.mp4 -i gp2.mp4 -filter_complex "[0:v]setpts=0.077*(PTS-STARTPTS), pad=iw*2:ih[bg]; [1:v]setpts=0.077*(PTS-STARTPTS)[fg]; [bg][fg]overlay=W-w-10:0:shortest=1[out]" -map "[out]" -map 0:a -c:v libx264 -crf 19 output2.avi
我的问题是，output2.avi 的所有帧都加速了，所以播放正常，但在压缩时间结束时，它播放的最后一帧的持续时间与非加速版本的持续时间相同。
正常加速视频需要播放 20 分钟，输出文件中留下 3 分钟。
并排提供 3 分钟的加速视频，然后在输出文件中提供 17 分钟的最后一帧。
C:\Users\scottt\Videos\R103>ffmpeg -i GOPR0004.MP4 -i GP010004.MP4 -filter_compl
ex "[0:v]setpts=0.077*(PTS-STARTPTS), pad=iw*2:ih[bg]; [1:v]setpts=0.077*(PTS-ST
ARTPTS)[fg]; [bg][fg]overlay=W-w-10:0:shortest=1[out]" -map "[out]" -map 0:a -c:
v libx264 -crf 19 output2.avi
ffmpeg version N-63146-g09cd228 Copyright (c) 2000-2014 the FFmpeg developers
built on May 14 2014 22:09:22 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
-enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-
libxvid --enable-decklink --enable-zlib
libavutil 52. 83.100 / 52. 83.100
libavcodec 55. 61.101 / 55. 61.101
libavformat 55. 37.102 / 55. 37.102
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 5.100 / 4. 5.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GOPR0004.MP4':
Metadata:
major_brand : avc1
minor_version : 0
compatible_brands: avc1isom
creation_time : 2014-04-15 15:32:32
Duration: 00:19:53.73, start: 0.000000, bitrate: 15120 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709
), 1280x720 [SAR 1:1 DAR 16:9], 14985 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94
tbc (default)
Metadata:
creation_time : 2014-04-15 15:32:32
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 15:31:36:03
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 12
7 kb/s (default)
Metadata:
creation_time : 2014-04-15 15:32:32
handler_name : GoPro AAC
timecode : 15:31:36:03
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2014-04-15 15:32:32
timecode : 15:31:36:03
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'GP010004.MP4':
Metadata:
major_brand : avc1
minor_version : 0
compatible_brands: avc1isom
creation_time : 2014-04-15 15:52:27
Duration: 00:19:53.73, start: 0.000000, bitrate: 15119 kb/s
Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709
), 1280x720 [SAR 1:1 DAR 16:9], 14983 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94
tbc (default)
Metadata:
creation_time : 2014-04-15 15:52:27
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 15:51:28:27
Stream #1:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 12
7 kb/s (default)
Metadata:
creation_time : 2014-04-15 15:52:27
handler_name : GoPro AAC
timecode : 15:51:28:27
Stream #1:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2014-04-15 15:52:27
timecode : 15:51:28:27
[swscaler @ 0000000002a95fe0] deprecated pixel format used, make sure you did se
t range correctly
[swscaler @ 00000000052429e0] deprecated pixel format used, make sure you did se
t range correctly
[libx264 @ 0000000002bfe620] using SAR=1/1
[libx264 @ 0000000002bfe620] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX
[libx264 @ 0000000002bfe620] profile High, level 4.0
Output #0, avi, to 'output2.avi':
Metadata:
major_brand : avc1
minor_version : 0
compatible_brands: avc1isom
ISFT : Lavf55.37.102
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 2560x720 [S
AR 1:1 DAR 32:9], q=-1--1, 29.97 tbn, 29.97 tbc (default)
Stream #0:1(eng): Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 48000 Hz, s
tereo, fltp (default)
Metadata:
creation_time : 2014-04-15 15:32:32
handler_name : GoPro AAC
timecode : 15:31:36:03
Stream mapping:
Stream #0:0 (h264) -> setpts (graph 0)
Stream #1:0 (h264) -> setpts (graph 0)
overlay (graph 0) -> Stream #0:0 (libx264)
Stream #0:1 -> #0:1 (aac -> libmp3lame)
Press [q] to stop, [?] for help
frame= 4 fps=0.0 q=0.0 size= 10kB time=00:00:01.34 bitrate= 59.5kbits/s
frame= 7 fps=7.0 q=0.0 size= 10kB time=00:00:02.66 bitrate= 30.0kbits/s
frame= 10 fps=6.6 q=0.0 size= 10kB time=00:00:03.96 bitrate= 20.2kbits/s
frame= 13 fps=6.5 q=0.0 size= 10kB time=00:00:05.30 bitrate= 15.1kbits/s
frame= 16 fps=6.4 q=0.0 size= 10kB time=00:00:06.62 bitrate= 12.1kbits/s
frame= 19 fps=6.3 q=0.0 size= 10kB time=00:00:07.96 bitrate= 10.0kbits/s
frame= 22 fps=6.3 q=0.0 size= 10kB time=00:00:09.31 bitrate= 8.6kbits/s
frame= 25 fps=6.2 q=0.0 size= 20kB time=00:00:10.65 bitrate= 15.7kbits/s
frame= 28 fps=6.2 q=0.0 size= 41kB time=00:00:11.95 bitrate= 28.2kbits/s
frame= 31 fps=6.2 q=0.0 size= 62kB time=00:00:13.27 bitrate= 38.4kbits/s
frame= 34 fps=6.2 q=0.0 size= 84kB time=00:00:14.61 bitrate= 46.9kbits/s
frame= 37 fps=6.1 q=0.0 size= 105kB time=00:00:15.93 bitrate= 53.8kbits/s
frame= 40 fps=6.1 q=0.0 size= 126kB time=00:00:17.25 bitrate= 59.7kbits/s
frame= 43 fps=6.1 q=0.0 size= 146kB time=00:00:18.50 bitrate= 64.5kbits/s
frame= 46 fps=6.1 q=0.0 size= 166kB time=00:00:19.75 bitrate= 68.7kbits/s
frame= 49 fps=6.1 q=0.0 size= 186kB time=00:00:21.02 bitrate= 72.4kbits/s
frame= 52 fps=6.1 q=0.0 size= 205kB time=00:00:22.24 bitrate= 75.6kbits/s
frame= 55 fps=6.1 q=0.0 size= 224kB time=00:00:23.42 bitrate= 78.4kbits/s
frame= 57 fps=6.0 q=25.0 size= 420kB time=00:00:24.55 bitrate= 140.2kbits/
frame= 60 fps=6.0 q=25.0 size= 570kB time=00:00:25.77 bitrate= 181.2kbits/
frame= 63 fps=6.0 q=25.0 size= 679kB time=00:00:26.97 bitrate= 206.2kbits/
frame= 66 fps=6.0 q=25.0 size= 782kB time=00:00:28.22 bitrate= 226.9kbits/
frame= 68 fps=5.9 q=25.0 size= 871kB time=00:00:29.42 bitrate= 242.4kbits/
frame= 71 fps=5.9 q=25.0 size= 1009kB time=00:00:30.60 bitrate= 270.1kbits/
frame= 74 fps=5.9 q=25.0 size= 1111kB time=00:00:31.80 bitrate= 286.3kbits/
frame= 77 fps=5.9 q=25.0 size= 1212kB time=00:00:33.02 bitrate= 300.7kbits/
frame= 79 fps=5.8 q=25.0 size= 1296kB time=00:00:34.20 bitrate= 310.5kbits/
frame= 82 fps=5.8 q=25.0 size= 1398kB time=00:00:35.37 bitrate= 323.7kbits/
frame= 85 fps=5.8 q=25.0 size= 1494kB time=00:00:36.57 bitrate= 334.5kbits/
frame= 88 fps=5.8 q=25.0 size= 1593kB time=00:00:37.80 bitrate= 345.3kbits/
frame= 90 fps=5.8 q=25.0 size= 1675kB time=00:00:38.90 bitrate= 352.6kbits/
frame= 93 fps=5.8 q=25.0 size= 1770kB time=00:00:40.08 bitrate= 361.8kbits/
frame= 96 fps=5.8 q=25.0 size= 1871kB time=00:00:41.25 bitrate= 371.5kbits/
frame= 98 fps=5.7 q=25.0 size= 1919kB time=00:00:42.43 bitrate= 370.4kbits/
frame= 101 fps=5.7 q=25.0 size= 2014kB time=00:00:43.63 bitrate= 378.1kbits/
frame= 104 fps=5.7 q=25.0 size= 2109kB time=00:00:44.83 bitrate= 385.5kbits/
frame= 104 fps=5.1 q=25.0 size= 2109kB time=00:00:44.83 bitrate= 385.5kbits/
frame= 107 fps=5.1 q=25.0 size= 2200kB time=00:00:45.98 bitrate= 392.0kbits/
frame= 109 fps=5.1 q=25.0 size= 2283kB time=00:00:47.20 bitrate= 396.2kbits/
frame= 112 fps=5.1 q=25.0 size= 2377kB time=00:00:48.45 bitrate= 401.8kbits/
frame= 115 fps=5.2 q=25.0 size= 2466kB time=00:00:49.58 bitrate= 407.5kbits/
frame= 115 fps=4.5 q=25.0 size= 2467kB time=00:00:49.60 bitrate= 407.3kbits/
frame= 118 fps=4.5 q=25.0 size= 2555kB time=00:00:50.76 bitrate= 412.3kbits/
frame= 120 fps=4.5 q=25.0 size= 2599kB time=00:00:51.93 bitrate= 409.9kbits/
frame= 123 fps=4.5 q=25.0 size= 2687kB time=00:00:53.18 bitrate= 413.9kbits/
frame= 126 fps=4.6 q=25.0 size= 2775kB time=00:00:54.43 bitrate= 417.6kbits/
frame= 129 fps=4.6 q=25.0 size= 2864kB time=00:00:55.58 bitrate= 422.1kbits/
frame= 132 fps=4.6 q=25.0 size= 2949kB time=00:00:56.78 bitrate= 425.4kbits/
frame= 134 fps=4.6 q=25.0 size= 2997kB time=00:00:58.03 bitrate= 423.1kbits/
frame= 137 fps=4.6 q=25.0 size= 3087kB time=00:00:59.18 bitrate= 427.3kbits/
frame= 140 fps=4.6 q=25.0 size= 3180kB time=00:01:00.38 bitrate= 431.4kbits/
frame= 143 fps=4.7 q=25.0 size= 3268kB time=00:01:01.58 bitrate= 434.7kbits/
frame= 145 fps=4.7 q=25.0 size= 3354kB time=00:01:02.76 bitrate= 437.7kbits/
frame= 147 fps=4.5 q=-1.0 Lsize= 5009kB time=00:01:03.52 bitrate= 645.9kbits
/s dup=0 drop=1748
video:3941kB audio:993kB subtitle:0kB other streams:0kB global headers:0kB muxin
g overhead: 1.527102%
[libx264 @ 0000000002bfe620] frame I:1 Avg QP:19.46 size:182228
[libx264 @ 0000000002bfe620] frame P:56 Avg QP:19.48 size: 45589
[libx264 @ 0000000002bfe620] frame B:90 Avg QP:21.55 size: 14448
[libx264 @ 0000000002bfe620] consecutive B-frames: 1.4% 35.4% 46.9% 16.3%
[libx264 @ 0000000002bfe620] mb I I16..4: 11.8% 55.4% 32.8%
[libx264 @ 0000000002bfe620] mb P I16..4: 0.6% 2.1% 0.4% P16..4: 42.8% 17.4
% 15.1% 0.0% 0.0% skip:21.5%
[libx264 @ 0000000002bfe620] mb B I16..4: 0.0% 0.6% 0.1% B16..8: 37.8% 3.7
% 0.8% direct: 2.9% skip:54.0% L0:45.0% L1:51.7% BI: 3.3%
[libx264 @ 0000000002bfe620] 8x8 transform intra:66.7% inter:58.5%
[libx264 @ 0000000002bfe620] coded y,uvDC,uvAC intra: 76.2% 74.7% 41.5% inter: 2
1.5% 22.6% 2.2%
[libx264 @ 0000000002bfe620] i16 v,h,dc,p: 24% 18% 26% 32%
[libx264 @ 0000000002bfe620] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 14% 33% 5% 10%
6% 10% 5% 7%
[libx264 @ 0000000002bfe620] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 18% 20% 6% 10%
6% 9% 5% 7%
[libx264 @ 0000000002bfe620] i8c dc,h,v,p: 57% 21% 15% 7%
[libx264 @ 0000000002bfe620] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000000002bfe620] ref P L0: 49.4% 10.2% 27.2% 13.2%
[libx264 @ 0000000002bfe620] ref B L0: 57.6% 35.7% 6.7%
[libx264 @ 0000000002bfe620] ref B L1: 87.7% 12.3%
[libx264 @ 0000000002bfe620] kb/s:6581.96
Received signal 2: terminating.
答案1
解决了我无法提高音频播放速度的问题。通过删除 -map 0:a 命令，我可以将叠加的视频加速到正确的时间，但没有音频。如果我想要音频，我会使用 casdade atempo 命令，直到我实现与视频匹配的播放速度，因为它将上升的最大速度是 2.0