![]() The following presets are available in descending order: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower and veryslow. A slower preset will provide a better compression. You can leave the default value or, for a smaller bitrate, you can raise the value:įFmpeg also provides several quality presets which are calibrated for a certain encoding speed to compression ratio. So the lower the value the better the quality. When encoding video with H.264, the video quality can be controlled using a quantizer scale (crf value, crf stands for Constant Rate Factor) which can take values from 0 to 51: 0 being lossless, 23 the default and 51 the worst possible. but FFmpeg provides a series of presets and controls to help you optimize for quality or faster conversions. Video conversion can be a lengthy and CPU intensive process, depending on file size, video and audio quality, video resolution, etc. When the WebM file contains VP8 or VP9 video, you have no choice but to transcode both the video and audio. The simplest catch all command to convert WebM to MP4 using FFmpeg is: webm file with 720p video and 48kHz Opus audio: VLC‘s Media Information window is very good in providing you with quick information about the number and types of streams available in a video. webm files already contain H.264 video in which case we can simply copy the video data over and transcode just the audio.Īudio data: A WebM file might contain sound encoded with Opus at 8-48kHz or Vorbis at 8-192kHz For them we’ll transcode the video data to H.264. Video data: Most WebM files will contain VP8 or VP9 for video. For details on how to use the 2nd one (it’s better) check out the FFmpeg’s AAC Encoding Guide. ![]() Our examples will be using the native AAC-LC library.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |