
ãªã¼ãã³ã½ã¼ã¹ã®ãã«ãã¡ãã£ã¢ãã¬ã¼ã ã¯ã¼ã¯ãFFmpegãã®éçºãã¼ã ãã³ãã³ãã©ã¤ã³ãã¼ã«ã®ãã«ãã¹ã¬ããåå®äºãå ±åãã¾ãããéçºãã¼ã ã¯ä¸é£ã®ä½æ¥ããããæ°åå¹´ã§æãè¤éãªãªãã¡ã¯ã¿ãªã³ã°ãã¨è¡¨ç¾ãã¦ãã¾ãã FFmpeg CLI multithreading is now merged! https://t.co/uUJ0SF0opwâ FFmpeg (@FFmpeg) December 12, 2023 FFmpegã¯é常ã«å¤ãã®ç¨®é¡ã®åç»ãã¡ã¤ã«ãé³å£°ãã¡ã¤ã«ãå¦çå¯è½ãªãã«ãã¡ãã£ã¢ãã¬ã¼ã ã¯ã¼ã¯ã§ãåç»ããã³é³å£°ãã¡ã¤ã«ã®åçãããªãã³ã°ãå¤æãå§ç¸®ãªã©å¤æ§ãªæä½ãå¯è½ã§ããFFmpegã¯ç´æ¥ã³ãã³ãã©ã¤ã³ãã使ããã»ããæ°å¤ãã®åç»åçã½ãããåç»ç·¨éã½ãããã¹ããªã¼ãã³ã°ãµã¼ãã¹ãªã©ã«çµã¿è¾¼ã¾ãã¦åºãå©ç¨ããã¦ãã¾ãã FFmpegã¯ã¨ã³ã³ã¼ãã¼ããã³ã¼ãã¼ããã«ãã
ãã£ã«ã¿å 容ãããã¹ãã§èªã¿è¾¼ã filter_scriptãfilter_complex_script ãªãã·ã§ã³ã¯ä½ãæå®ããªãã¨æ¢å®å¤ãå ¥åããããæå®ã«ã¯ãªãã·ã§ã³åãæå®ããã®ã¨ããªãã®ããããæå®ããªãã»ã㯠ffmpeg -h filter=ãã£ã«ã¿åã§è¡¨ç¤ºãããé çªã«æå®ããªããã°ãªããªããåãæå³ã®ãªãã·ã§ã³ã¯ã¾ã¨ãã¦ä¸ã¤ã®é çªã¨ããããã®ãã«ãã³ãã³ãã®é çªã¨å ¬å¼ãµã¤ãã®é çªãä¸è´ããªããã¨ããã¾ã«ããããffmpeg -h filter=ãã£ã«ã¿åã®é çªãæ£ãããæ¢å®å¤ä»¥å¤ãæå®ããã¨ãã¯å¥éãªãã·ã§ã³åãæå®ãã¦å¤ãæå®ããã[int]ã®æå®é ã¯åºæ¬ãã«ãã®é çªã ããffmpeg 4.3ã§ã¯å¯¾å¿ããæ°å¤ããã«ãã³ãã³ãã§è¡¨ç¤ºãããã cropï¼åãåºããã£ã«ã¿ï¼ãä¾ã«ãããæåã®å¼æ°ã®åã«=ï¼ã¤ã³ã¼ã«ï¼ã§ã¤ãªãã¦ç¬¬1å¼æ°ãæå®ã第2å¼æ°ä»¥éã¯:ï¼ã³ãã³ï¼ã§ã¤ãªããå¼
Overview One of the great features of ffmpeg filtering library is the ability to create overlays, allowing users to put one video over another. We can also use this feature to implement the mosaic video output, usually used in security surveillance systems. An example of what we are going to achieve in this tutorial is displayed in the following screenshot: We can see one video, displaying 4 diffe
æè¿ã¯ããã®ã¦ã¼ãã¥ã¼ãã¼ã®çãããã¢ã³ã¹ãã§éãã åç» ãYouTubeã«ããããæ稿ããã¦ã¾ã ã¨ã¦ãå ¨é¨ã¯è¦åããªãã®ã§æå㪠人æ°åç»é ä¿¡è ã®ãã®ã ãããã£ã¨è¦³ãã ãã§ãã ã¢ã³ã¹ãã®ã¬ãã£ã®åç»ã¯çµæ§å¥½ã ã§ããªã¢ã¯ã·ã§ã³ãè¦ã¦ã㨠楽ãããããã§ãâãããªæãã§ç»é¢ååå²ããåæããåç»ãã¤ãããªãããªã¼ã¨ãã£ã¦ã¿ã¾ãã ã¢ã³ã¹ãã¬ãã£ãååå²ã§åæããåç» å®ç¾ã«åãã¦ããã㨠ã¿ã¤ãã³ã°ãåããã ã®ãéè¦ã§ãã ãã®ããã«ååç»ã®ã¬ãã£ã®ã¿ã¤ãã³ã°ãä¸è´ãããã¬ã¼ã çªå· ãè¦ã¤ããå¿ è¦ãããã¾ãã ãã£ãããã£ã¦ã¿ã¾ãã®ã§ä¸æºå åç» ããç»åãã¡ã¤ã« ãåãåºã ffmpeg ã使ã£ã¦âä¸ã®ããã«ãã¦ãã¬ã¼ã ãç»åã«ãã¦ãã¾ãã¾ãããã®åã«ä¸æºåã§fpsã20fpsã¨ãã«æãã¦ããã®ãè¯ãããããã¾ãããããã«ãã¦ãç»åå¦çã¯PCãç±ã ãã¦ããã¾ãã ç¹å¾´ã¨ãªãã¿ã¤ã
WebAssemblyã¯ãã©ã¦ã¶ä¸ã§æ©æ¢°èªãå®è¡å¯è½ããJavaScriptãè£å®ãã¦ããã©ã¼ãã³ã¹ãé«ããæè¡ã§ãããã®WebAssemblyã®ãã¤ããªå½¢å¼ã§åç»å¦çã½ããã¦ã§ã¢ãFFmpegããã³ã³ãã¤ã«ãããã©ã¦ã¶ä¸ã§ã®åç»çæãå¤æãè¡ããã½ããã¦ã§ã¢ããffmpeg.wasmãã§ãã FFMPEG.WASM https://ffmpegwasm.github.io/ GitHub - ffmpegwasm/ffmpeg.wasm: FFmpeg for browser and node, powered by WebAssembly https://github.com/ffmpegwasm/ffmpeg.wasm ãffmpeg.wasmãã®ãwasmãã¯WebAssemblyã®ç¥ç§°ã§ãJavaScriptããFFmpegãå©ç¨å¯è½ã«ãããã¨ã§ãã©ã¦ã¶ãNode.jsä¸ã§åç»ã®
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主ã«ä»äºã§ãffmpegãVLCã®ãããªOSSãå©ç¨ãã¦ãåç»ããã³ã¼ããããã¨ã³ã³ã¼ããããã¨ãã¡ããã¡ããããã®ã§ããã ããããã®ã使ã£ãã¨ãã«MEPG-LAã®ä¿æãã¦ããç¹è¨±ãã¼ã«ã«çªã£è¾¼ããã¨ã«ãªããªãã®ããæ°ã«ãªã£ãã®ã§ãã®éããããªããã¦ãããã¨ã«ãã¾ããã ffmpegã®è¦è§£ MPEG-LA ã¯ãAppleãMicrosoftãFujitsuãSonyçççã¨ãã£ãåç«ããä¼æ¥ãåãé£ããLLCã§ãMPEG2ã³ã¼ããã¯ãMPEG2-SystemsãH264/AVCçãåç»ã«ã¾ã¤ããå¤æ°ã®ç¹è¨±ãä¿æãã¦ãã¾ãã å½ç¶ãffmpegçãå©ç¨ãã¦åç»ããã³ã¼ãã»ã¨ã³ã³ã¼ãã§ããè½åãåããã½ããã¦ã§ã¢ãæä¾ããã¨ãã«ãããããã®ç¹è¨±ãåé¡ã«ãªã£ã¦ããå¯è½æ§ãããã¾ãã ffmpegèªä½ã¯ãã©ã³ãã£ã¢ã§éçºããã¦ãããMPEG-LAã«ã©ã¤ã»ã³ã¹æãæ¯æãåå ¥æºãããã¨ã¯æããªãã«ã
atrpmsã§ffmpegãã¤ã³ã¹ãã¼ã«ã§ããããã§ããï¼atrpmsã«ã¢ã¯ã»ã¹ã§ããªãã£ã(2015-9-29)ã®ã§nux-dextopããffmpegãã¤ã³ã¹ãã¼ã«ããï¼ ãªãã¸ããªã®è¿½å CentOS7ã¸ã®ãªãã¸ããªã®è¿½å æ¹æ³ã¾ã¨ããåèã«ã㦠EPEL Nux-Dextop ã追å ã¤ã³ã¹ãã¼ã« $ sudo yum -y --enablerepo=epel,nux-dextop install ffmpeg ç¢ºèª $ ffmpeg -version ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-9) configuration: --prefix=/usr --bindir=/usr/bin
FFmpegã§x264ã®ã¨ã³ã³ã¼ããããå ´åããªãã·ã§ã³ã«ã-vcodec libx264ããæå®ãã¾ããã以ä¸ã®ãããªã¨ã©ã¼ãåºã¦ã¨ã³ã³ã¼ãã§ããªããã¨ãããã¾ãã Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height ãã®å ´åã以ä¸ã®ãªãã·ã§ã³ã追å ããã°è§£æ±ºã§ãã¾ãã -g 150 -qcomp 0.7 -qmin 10 -qmax 51 -qdiff 4 -subq 6 -me_range 16 -i_qfactor 0.714286 ãã®ã¨ã©ã¼ã®åå ã¯ãlibx264å´ã§FFmpegã®ããã©ã«ãå¤ãå¤å®ããä¸å®ã®æ¡ä»¶ãæºããã¨ã¨ã©ã¼ã§çµäºããããã«ãªã£ã¦ããããã§ãã å¤å®ã®å¯¾è±¡ã¨ãªãFFmpeg
FFmpegãtrunkçã«ããã¦VP8ã®ãã¤ãã£ããã³ã¼ãã«å¯¾å¿ããï¼ã¡ã¼ãªã³ã°ãªã¹ãã®ã¹ã¬ãããã³ãããã¡ã¼ã«ï¼ãlibvpxãããé«éããããã¤ã³ãã©ã®ã¿ã®åç»ã«ããã¦æ大10%ãä¸è¬çãªåç»ã«ããã¦ã¯40ï½50%ãæ©ãã¨ãããéçºè ã¯Matroska muxerã2007å¹´ã®GSoCã§éçºããDavid Conradæ°ã¨WMA Voiceã®ãã³ã¼ããéçºããRonald S. Bultjeæ°ãã¾ãx264ã®Jason Garrett-Glaseræ°ãSIMDæé©åã®é¢ã§ååãã¦ããï¼é¢é£ã¹ã¬ããï¼ã
ãã®åã®è¨äºã§FFMpegã¨é¢é£ããã³ã¼ããã¯ã®ãã¼ã¸ã§ã³ã¢ãããããã¨ãã«libx264ããªãã·ã§ã³ãããã¤ãå¤æ´ããã¦ãã¦ãåã®ã³ãã³ãã§å¤æã§ããªãã£ãã®ã§èª¿æ»ã ã¾ãã¯åèãµã¤ã FFmpeg x264 encoding guide x264 ffmpeg mapping and options guide å®éã«å¤æããã³ãã³ãã¯æ¬¡ã®ãããªæãã ffmpeg -i 'input.mov' -vcodec 'libx264' -s '640x480' -b '501251' -r '29.97' -acodec 'libfaac' -ab '128000' -ar '44100' -ac '2' -level 41 -vpre hq -coder 1 -bf 16 -crf 25 -threads 0 -bufsize 20000k -maxrate 25000kÂ
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