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.
The value changes depending on the audio encoder.įFmpeg currently supports two AAC-LC encoders: Our examples will be using the native AAC-LC library. You can select an audio quality level with -qscale:a (or the alias -q:a ). Most of the time this should be the preferred method. This is a variable bit rate mode, roughly analogous to using -qp (constant QP ) with x264. Is there a variable bit rate mode in FFmpeg? In other words, it is not possible to build one FFmpeg with multiple versions of x264 with different bit depths.
FFmpeg only supports one bit depth in one particular build. The exact bit depth is controlled at x264’s configure time. See FFmpeg Wiki: H.264 and FFmpeg Wiki: AAC for more info.How many bit depths does FFmpeg support x264?
This allows the video to begin playing faster if it is watched via progressive download playback.