ffmpeg speed up encoding
... input.mp4 -vcodec libx264 -crf 27 -preset veryfast -c:a copy -s 960x540 output.mp4. In CRF mode, x264 encodes video to maintain a certain quality throughout. Lower values produce higher quality but larger files. Combined with veryfast preset, it shou, up vote 3 down vote. Use -speed number (e.g. 8), not -preset setting (e.g. ultrafast ). The later is for x264/x265 encoding. A Higher number means faster encoding, so ultrafast would map to 8 or so. Very slow/placebo maps to 0, and values in between map , Hi cats please I wonder if is there a way to improve speed of encoding dunrig the ffmpeg encoding process I have a HP envy J113 EL pc windows 10 64. ... And more importantly, QTGMC has a very good multi-thread version that, when properly optimized for yo, 2. You are de-interlacing HD footage. Do you really need to do that since speed is such a paramount concern for you? What are you gaining from de-interlacing? Leaving it interlaced should speed things up as well. 3. You are running x264 through ffmpeg an, A preset is a collection of options that will provide a certain encoding speed to compression ratio. A slower preset will provide better compression (compression is quality per filesize). This means that, for example, if you target a certain file size or, To double the speed of the video, you can use: ffmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv. The filter works by changing the presentation timestamp (PTS) of each video frame. For example, if there are two succesive frames shown at, Give this a try: ffmpeg -i audio.m4a -loop 1 -r 2 -i image.jpg -c:a copy -c:v libx264 -preset ultrafast -shortest out.mp4. -r 2 sets the frame rate to 2 fps (some players seem to have problems with 1 fps)., With libx264, the best outcome (in terms of speed -- frames per second) is with -threads 0 (supposed to find how many threads are available), or no thread option. - With libxvid, the best outcomes are -thread 6 (still on a 4-core machine) and -threads 4,, In your 1st posting, ffmpeg cli output, can be seen that the file is encode with threads=1, that suggests on EC2 only 1 cpu core is presented to ffmpeg. So if more cores are available to you on EC2 you probably have to specifically have to ask for more c,Dear Group: I am encoding an FLV that is 1m39s long. It contains SPEEX audio and H.264 video. It was encoded at variable bit rate. I successfully transcode it to MP4 (AAC audio, and H264 video) using the following command. ffmpeg -y -i
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 ffmpeg speed up encoding 相關參考資料
video - ffmpeg command for faster encoding at a decent bitrate ...
... input.mp4 -vcodec libx264 -crf 27 -preset veryfast -c:a copy -s 960x540 output.mp4. In CRF mode, x264 encodes video to maintain a certain quality throughout. Lower values produce higher quality b... https://stackoverflow.com video - ffmpeg - very slow conversion - Stack Overflow
up vote 3 down vote. Use -speed number (e.g. 8), not -preset setting (e.g. ultrafast ). The later is for x264/x265 encoding. A Higher number means faster encoding, so ultrafast would map to 8 or so. ... https://stackoverflow.com How can improve speed of ffmpeg encoding? - VideoHelp Forum
Hi cats please I wonder if is there a way to improve speed of encoding dunrig the ffmpeg encoding process I have a HP envy J113 EL pc windows 10 64. ... And more importantly, QTGMC has a very good mu... https://forum.videohelp.com how to improve speed encoding ffmpeg? - VideoHelp Forum
2. You are de-interlacing HD footage. Do you really need to do that since speed is such a paramount concern for you? What are you gaining from de-interlacing? Leaving it interlaced should speed thing... https://forum.videohelp.com EncodeH.264 – FFmpeg
A preset is a collection of options that will provide a certain encoding speed to compression ratio. A slower preset will provide better compression (compression is quality per filesize). This means ... https://trac.ffmpeg.org How to speed up slow down a video – FFmpeg
To double the speed of the video, you can use: ffmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv. The filter works by changing the presentation timestamp (PTS) of each video frame. ... https://trac.ffmpeg.org How do I speedup encoding of a video that has just 1 static frame ...
Give this a try: ffmpeg -i audio.m4a -loop 1 -r 2 -i image.jpg -c:a copy -c:v libx264 -preset ultrafast -shortest out.mp4. -r 2 sets the frame rate to 2 fps (some players seem to have problems with 1... https://video.stackexchange.co How to optimize multicore encoding - FFmpeg
With libx264, the best outcome (in terms of speed -- frames per second) is with -threads 0 (supposed to find how many threads are available), or no thread option. - With libxvid, the best outcomes ar... https://ffmpeg.zeranoe.com [FFmpeg-user] Can I speed up transcoding?
In your 1st posting, ffmpeg cli output, can be seen that the file is encode with threads=1, that suggests on EC2 only 1 cpu core is presented to ffmpeg. So if more cores are available to you on EC2 y... https://lists.ffmpeg.org FFmpeg-users - Can I speed up transcoding?
Dear Group: I am encoding an FLV that is 1m39s long. It contains SPEEX audio and H.264 video. It was encoded at variable bit rate. I successfully transcode it to MP4 (AAC audio, and H264 video) using ... http://www.ffmpeg-archive.org |