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Today, I will talk to you about how Java implements video custom clipping. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something from this article.

Preface

The following is a Java utility class that tailors videos to custom sizes, as pragmatic as ever.

Maven relies on com.google.guava guava 30.1.1-jre org.bytedeco javacv-platform 1.5.5 cn.hutool hutool-all 5.5.2 code

No nonsense, go to the code.

Package ai.guiji.csdn.tool;import cn.hutool.core.util.IdUtil;import com.google.common.base.Joiner;import com.google.common.base.Splitter;import org.bytedeco.javacpp.Loader;import java.io.File;import java.text.MessageFormat;import java.util.Arrays;import java.util.List / * @ Program: csdn @ ClassName: CutOutTool @ Author: swordsman A Liang _ ALiang @ Date: 2022-01-23 18:27 @ Description: * clipping tool @ Version: V1.0 * / public class CutOutTool {/ * Video clipping * * @ param videoPath video address * @ param outputDir temporary directory * @ param startX clipping start x coordinates @ param startY clipping start Y coordinate * @ param weight crop width * @ param height crop height * @ throws Exception exception * / public static String cutOutVideo (String videoPath String outputDir, Integer startX, Integer startY, Integer weight, Integer height) throws Exception {List paths = Splitter.on (".") .splitToList (videoPath) String ext = paths.get (paths.size ()-1); if (! Arrays.asList ("mp4", "avi", "flv"). Join (ext) {throw new Exception ("format error");} String resultPath = Joiner.on (File.separator) .join (outputDir, IdUtil.simpleUUID () + "." + ext); String ffmpeg = Loader.load (org.bytedeco.ffmpeg.ffmpeg.class) ProcessBuilder builder = new ProcessBuilder (ffmpeg, "- I", videoPath, "- vf", MessageFormat.format ("crop= {0}: {1}: {2}: {3}", String.valueOf (weight), String.valueOf (height), String.valueOf (startX)) String.valueOf (startY)), "- b", "2000k", "- y", "- threads", "5", "- preset", "ultrafast", "- strict", "- 2", resultPath) Builder.inheritIO (). Start (). WaitFor (); return resultPath;} public static void main (String [] args) throws Exception {System.out.println (cutOutVideo ("C:\ Users\\ yi\\ Desktop\ 3.mp4", "C:\ Users\\ yi\\ Desktop\", 0,0,960, 1080));}}

Code description:

1. The parameters of cutOutVideo method are video path, output temporary directory, starting coordinate x value, starting coordinate y value, clipping width and clipping height.

2. Use uuid as the only id for temporary output to avoid repetition.

3. Check the file suffix format, and you can adjust it according to your needs.

4. The cropping size cannot exceed the video resolution limit, and can be adjusted according to the demand.

Verify it.

The prepared video is as follows

Execution result

Ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 10.2.0 (Rev5, Built by MSYS2 project) configuration:-- prefix=.. -- disable-iconv-- disable-opencl-- disable-sdl2-- disable-bzlib-- disable-lzma-- disable-linux-perf-- enable-shared-- enable-version3-- enable-runtime-cpudetect-- enable-zlib-- enable-libmp3lame-- enable-libspeex-- enable-libopencore-amrnb-- enable-libopencore-amrwb-- enable-libvo-amrwbenc-- enable-openssl-- enable-libopenh364-enable-libvpx-- enable-libfreetype-- enable-libopus-- enable-cuda-- enable-cuvid -- enable-nvenc-- enable-libmfx-- enable-w32threads-- enable-indev=dshow-- target-os=mingw32-- cc='gcc-M64'-- extra-cflags=-I../include/-- extra-ldflags=-L../lib/-- extra-libs='-static-libgcc-static-libstdc++-Wl Bstatic-lstdc++-lgcc_eh-lWs2_32-lcrypt32-lpthread-lz-lm-Wl,-Bdynamic-lole32-luuid' libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100Input # 0, mov,mp4,m4a,3gp,3g2,mj2, from'C:\ Users\ yi\ Desktop\ 3.mp4bicycle: Metadata: major_brand: isom minor_version: 512 compatible_brands: isomiso2avc1mp41 encoder: Lavf58.45.100 Duration: 0000 7.100Input 31.02 Start: 0.000000, bitrate: 3666 kb/s Stream # 0:0 (und): Video: h364 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 3278 kb/s, 24 fps, 24.42 tbr, 19536 tbn, 48.84 tbc (default) Metadata: handler_name: VideoHandler Stream # 0:1 (und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp 384 kb/s (default) Metadata: handler_name: SoundHandlerPlease use-Set the encoding preset an or-b Desktop v,-b is ambiguousCodec AVOption preset (Set the encoding preset) specified for output file # 0 (C:\ Users\ yi\ Desktop\\ 0ba24b19db0c47faa2cd25bcaee8a3ed.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. A video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.Stream mapping: Stream # 0:0-> # 0:0 (h364 (native)-> mpeg4 (native)) Stream # 0:1-> # 0:1 (aac (native)-> aac (native)) Press [Q] to stop, [?] For helpOutput # 0, mp4, to'C:\ Users\ yi\ Desktop\ 0ba24b19db0c47faa2cd25bcaee8a3ed.mp4regions: Metadata: major_brand: isom minor_version: 512 compatible_brands: isomiso2avc1mp41 encoder: Lavf58.45.100 Stream # 0:0 (und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 960x1080 [SAR 1:1 DAR 8:9], Qroom2-31, 2000 kb/s, 24.42 fps, 19536 tbn 24.42 tbc (default) Metadata: handler_name: VideoHandler encoder: Lavc58.91.100 mpeg4 Side data: cpb: bitrate max/min/avg: 0vbv_delay 0000000 buffer size: 0 vbv_delay: a Stream # 0:1 (und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp 128 kb/s (default) Metadata: handler_name: SoundHandler encoder: Lavc58.91.100 aacframe= 732 fps=251 quli1.6 Lsize= 7575kB time=00:00:30.01 bitrate=2067.5kbits/s dup=13 drop=0 speed=10.3x video:7087kB audio:470kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.249497% [aac @ 0000022b33400c40] Qavg: 197.756C:\ Users\ yi\ Desktop\\ 0ba24b19db0c47faa2cd25bcaee8a3ed.mp4Process finished with exit code 0

The result video is as follows

After reading the above, do you have any further understanding of how Java implements custom video clipping? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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