FFMPEG 在单个命令中缩放和裁剪
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【中文标题】FFMPEG 在单个命令中缩放和裁剪【英文标题】：FFMPEG scale and crop in single command 【发布时间】：2016-03-25 14:32:34 【问题描述】：我正在使用以下库在 android 上使用 FFMPEG：http://writingminds.github.io/ffmpeg-android-java/
这是我正在使用的命令：
"-i " + path + " -vf scale=480:360,crop=360:360:0:00 -strict -2 -preset ultrafast " + fileOutPath
我的目标是将图像缩小到 480x360，然后将其从 (0,0)（左上角）裁剪为 360x360。然而，最终发生的是它从垂直中心裁剪。因此，例如，如果您要在整个屏幕上拍摄三个块的视频，则裁剪最终将只显示中间块，而我想要顶部块。
关于我做错了什么有什么想法吗？
我的最终目标是获得一个 360x360 大小的方形视频。
输出日志：
03-26 12:10:16.816 17198-17198/com.noq D/FFMPEG: FFMPEG onStart
03-26 12:10:16.900 17198-17385/com.noq D/FFmpeg: Running publishing updates method
03-26 12:10:16.914 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: WARNING: linker: /data/user/0/com.noq/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
03-26 12:10:17.004 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
03-26 12:10:17.004 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
03-26 12:10:17.007 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
03-26 12:10:17.021 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libavutil 54. 7.100 / 54. 7.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libavcodec 56. 1.100 / 56. 1.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libavformat 56. 4.101 / 56. 4.101
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libavdevice 56. 0.100 / 56. 0.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libavfilter 5. 1.100 / 5. 1.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libswscale 3. 0.100 / 3. 0.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libswresample 1. 1.100 / 1. 1.100
03-26 12:10:17.022 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: libpostproc 53. 0.100 / 53. 0.100
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.noq/files/Pictures/noq/1459008610063.mp4':
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: major_brand : mp42
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: minor_version : 0
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: compatible_brands: isommp42
03-26 12:10:17.201 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: creation_time : 2016-03-26 16:10:16
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Duration: 00:00:02.02, start: 0.000000, bitrate: 6131 kb/s
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 5926 kb/s, SAR 65536:65536 DAR 4:3, 29.87 fps, 30.17 tbr, 90k tbn, 180k tbc (default)
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: rotate : 270
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: creation_time : 2016-03-26 16:10:16
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: handler_name : VideoHandle
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: encoder : MOTO
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Side data:
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: displaymatrix: rotation of 90.00 degrees
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 130 kb/s (default)
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: creation_time : 2016-03-26 16:10:16
03-26 12:10:17.202 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: handler_name : SoundHandle
03-26 12:10:17.263 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] using SAR=1/1
03-26 12:10:17.297 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] using cpu capabilities: none!
03-26 12:10:17.411 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] profile Constrained Baseline, level 2.1
03-26 12:10:17.417 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Output #0, mp4, to '/storage/emulated/0/Android/data/com.noq/files/Pictures/noq/14590086100631459008616802_square.mp4':
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: major_brand : mp42
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: minor_version : 0
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: compatible_brands: isommp42
03-26 12:10:17.464 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: encoder : Lavf56.4.101
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 360x360 [SAR 1:1 DAR 1:1], q=-1--1, 30.17 fps, 11584 tbn, 30.17 tbc (default)
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: rotate : 270
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: creation_time : 2016-03-26 16:10:16
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: handler_name : VideoHandle
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: encoder : Lavc56.1.100 libx264
03-26 12:10:17.465 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
03-26 12:10:17.466 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Metadata:
03-26 12:10:17.466 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: creation_time : 2016-03-26 16:10:16
03-26 12:10:17.466 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: handler_name : SoundHandle
03-26 12:10:17.467 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: encoder : Lavc56.1.100 aac
03-26 12:10:17.467 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream mapping:
03-26 12:10:17.467 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
03-26 12:10:17.467 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Stream #0:1 -> #0:1 (aac (native) -> aac (native))
03-26 12:10:17.468 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: Press [q] to stop, [?] for help
03-26 12:10:18.035 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: frame= 3 fps=0.0 q=0.0 size= 0kB time=00:00:01.00 bitrate= 0.4kbits/s dup=1 drop=0
03-26 12:10:18.526 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: frame= 21 fps= 20 q=24.0 size= 48kB time=00:00:01.00 bitrate= 390.3kbits/s dup=1 drop=0
03-26 12:10:19.008 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: frame= 26 fps= 17 q=25.0 size= 68kB time=00:00:01.85 bitrate= 301.1kbits/s dup=1 drop=0
03-26 12:10:19.533 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: frame= 47 fps= 23 q=23.0 size= 165kB time=00:00:01.87 bitrate= 719.7kbits/s dup=1 drop=0
03-26 12:10:19.956 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: frame= 62 fps= 25 q=-1.0 Lsize= 297kB time=00:00:02.05 bitrate=1184.9kbits/s dup=1 drop=0
03-26 12:10:19.956 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: video:262kB audio:33kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.992648%
03-26 12:10:19.984 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] frame I:1 Avg QP:20.00 size: 18507
03-26 12:10:19.984 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] frame P:61 Avg QP:23.52 size: 4079
03-26 12:10:19.984 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] mb I I16..4: 100.0% 0.0% 0.0%
03-26 12:10:19.984 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] mb P I16..4: 4.4% 0.0% 0.0% P16..4: 70.9% 0.0% 0.0% 0.0% 0.0% skip:24.7%
03-26 12:10:19.985 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] coded y,uvDC,uvAC intra: 44.6% 40.1% 14.8% inter: 39.1% 32.7% 0.6%
03-26 12:10:19.985 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] i16 v,h,dc,p: 42% 24% 21% 13%
03-26 12:10:19.986 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] i8c dc,h,v,p: 44% 24% 25% 8%
03-26 12:10:19.987 17198-17198/com.noq D/FFMPEG: FFMPEG onProgress: [libx264 @ 0xb78cde30] kb/s:1040.60
03-26 12:10:20.002 17198-17198/com.noq D/FFMPEG: FFMPEG onSuccess: WARNING: linker: /data/user/0/com.noq/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.noq/files/Pictures/noq/1459008610063.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2016-03-26 16:10:16
Duration: 00:00:02.02, start: 0.000000, bitrate: 6131 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 5926 kb/s, SAR 65536:65536 DAR 4:3, 29.87 fps, 30.17 tbr, 90k tbn, 180k tbc (default)
Metadata:
rotate : 270
creation_time : 2016-03-26 16:10:16
handler_name : VideoHandle
encoder : MOTO
Side data:
displaymatrix: rotation of 90.00 degrees
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 130 kb/s (default)
Metadata:
creation_time : 2016-03-26 16:10:16
handler_name : SoundHandle
[libx264 @ 0xb78cde30] using SAR=1/1
[libx264 @ 0xb78cde30] using cpu capabilities: none!
[libx264 @ 0xb78cde30] profile Constrained Baseline, level 2.1
[libx264 @ 0xb78cde30] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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
Output #0, mp4, to '/storage/emulated/0/Android/data/com.noq/files/Pictures/noq/14590086100631459008616802_square.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
encoder : Lavf56.4.101
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 360x360 [SAR 1:1 DAR 1:1], q=-1--1, 30.17 fps, 11584 tbn, 30.17 tbc (default)
Metadata:
rotate : 270
creation_time : 2016-03-26 16:10:16
handler_name : VideoHandle
encoder : Lavc56.1.100 libx264
Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
creation_time : 2016-03-26 16:10:16
handler_name : SoundHandle
encoder : La
03-26 12:10:20.037 17198-17198/com.noq D/FFMPEG: FFMPEG onFinish【问题讨论】：
应该按预期工作。 @Mulvya...应该，但不应该:) 只进行裁剪，看看行为是否相同。 @Mulvya 如果我只进行裁剪，它会从原始视频源中进行 360x360 裁剪，这不是我需要的。它必须按比例缩放。我基本上需要原始视频的整个宽度，而不是一部分。 是的，但是请检查它是从左上角还是中心。 【参考方案1】：您的源视频已旋转 90 度！
与原始像素矩阵一起使用
-vf scale=480:360,crop=360:360:120:0
旋转重置，2015 年 5 月或更高版本的 ffmpeg 版本。
"-noautorotate -i " + path + \
" -vf scale=480:360,transpose=2,crop=360:360:0:0
-strict -2 -preset ultrafast -metadata:s:v rotate=0" + fileOutPath
对于旧版本，请跳过 noautorotate 标志。
【讨论】：
不，不是：/你为什么这么说？ This: "displaymatrix: 旋转 90.00 度" 我希望你是对的 :( 这只是水平拉伸了我的视频 @Mulvya 我相信 2.4.2 对于自动轮换和-noautorotate 选项来说太旧了。
已更新。我的第一个命令假定旧版本不会重置轮换标签。以上是关于FFMPEG 在单个命令中缩放和裁剪的主要内容，如果未能解决你的问题，请参考以下文章
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