问题描述
我有一个持续时间为14秒的视频。我应用了setPTS过滤器，使其速度降低了3倍。因此，总持续时间应为42s（14 * 3）。但是输出给出了49秒长的视频。这是命令：
ffmpeg -i video.mp4 -filter_complex "[0:v]setpts=3*PTS[v];[0:a]atempo=0.6,atempo=0.5[a]" -map "[v]" -map "[a]" output.mp4
此命令有什么问题？我为不同的视频尝试过，但是所有问题都相同。任何帮助将不胜感激。问候。
日志：
ffmpeg version git-2020-08-31-4a11a6f copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.1 (GCC) 20200805
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --enable-libsvtav1 --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 58.100 / 56. 58.100
libavcodec 58.101.101 / 58.101.101
libavformat 58. 51.101 / 58. 51.101
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
libpostproc 55. 8.100 / 55. 8.100
Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'video.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2018-11-20T06:28:07.000000Z
Duration: 00:00:14.72,start: 0.000000,bitrate: 688 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661),yuv420p(tv,unkNown/bt470bg/unkNown),198x360 [SAR 1:1 DAR 11:20],592 kb/s,29.93 fps,29.93 tbr,29931 tbn,59.86 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D),44100 Hz,stereo,fltp,96 kb/s (default)
Metadata:
creation_time : 2018-11-20T06:28:07.000000Z
handler_name : IsoMedia File Produced by Google,5-11-2011
File 'output.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
Stream #0:0 (h264) -> setpts
Stream #0:1 (aac) -> atempo
setpts -> Stream #0:0 (libx264)
atempo -> Stream #0:1 (aac)
Press [q] to stop,[?] for help
[libx264 @ 0000021e37f15340] using SAR=1/1
[libx264 @ 0000021e37f15340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000021e37f15340] profile High,level 1.3,4:2:0,8-bit
[libx264 @ 0000021e37f15340] 264 - core 161 - H.264/MPEG-4 AVC codec - copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0,to 'output.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
encoder : Lavf58.51.101
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),yuv420p(progressive),q=-1--1,29.93 tbc (default)
Metadata:
encoder : Lavc58.101.101 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D),128 kb/s (default)
Metadata:
encoder : Lavc58.101.101 aac
frame= 1313 fps=256 q=-1.0 Lsize= 2241kB time=00:00:44.11 bitrate= 416.2kbits/s dup=875 drop=0 speed=8.61x
video:1500kB audio:693kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.182632%
[libx264 @ 0000021e37f15340] frame I:7 Avg QP:21.61 size: 18425
[libx264 @ 0000021e37f15340] frame P:331 Avg QP:24.78 size: 3593
[libx264 @ 0000021e37f15340] frame B:975 Avg QP:31.57 size: 223
[libx264 @ 0000021e37f15340] consecutive B-frames: 0.8% 0.2% 1.6% 97.5%
[libx264 @ 0000021e37f15340] mb I I16..4: 3.6% 31.1% 65.3%
[libx264 @ 0000021e37f15340] mb P I16..4: 0.8% 1.3% 4.2% P16..4: 37.0% 29.0% 15.9% 0.0% 0.0% skip:11.7%
[libx264 @ 0000021e37f15340] mb B I16..4: 0.0% 0.0% 0.2% B16..8: 8.4% 2.8% 1.2% direct: 0.4% skip:87.0% L0:61.8% L1:31.0% BI: 7.3%
[libx264 @ 0000021e37f15340] 8x8 transform intra:22.3% inter:18.7%
[libx264 @ 0000021e37f15340] coded y,uvDC,uvAC intra: 73.2% 85.7% 52.9% inter: 11.6% 7.4% 0.7%
[libx264 @ 0000021e37f15340] i16 v,h,dc,p: 25% 33% 22% 19%
[libx264 @ 0000021e37f15340] i8 v,ddl,ddr,vr,hd,vl,hu: 20% 28% 19% 4% 5% 4% 7% 5% 7%
[libx264 @ 0000021e37f15340] i4 v,hu: 23% 26% 13% 5% 7% 6% 7% 6% 7%
[libx264 @ 0000021e37f15340] i8c dc,v,p: 38% 29% 22% 11%
[libx264 @ 0000021e37f15340] Weighted P-Frames: Y:2.7% UV:0.3%
[libx264 @ 0000021e37f15340] ref P L0: 86.1% 8.9% 3.6% 1.4% 0.1%
[libx264 @ 0000021e37f15340] ref B L0: 94.7% 4.6% 0.8%
[libx264 @ 0000021e37f15340] ref B L1: 99.3% 0.7%
[libx264 @ 0000021e37f15340] kb/s:280.02
[aac @ 0000021e3847c900] Qavg: 729.586
解决方法
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