Slower encoding means that more time is needed, but the compression rate is better. Possible -preset values for the H.264 codec include veryslow, slow, medium, fast and veryfast. ![]() If the source should be RGB, then you might choose the video codec libx264rgb rather than libx264. The video codec is specified by -codec:video, which may be abbreviated as -c:v (or -codec:v or -c:video). ![]() c:a copy re-encodes the audio stream using the same audio codec output_file path, name and extension of the output file Discussion pix_fmt yuv420p The pixel format for “YUV” colour space with 4:2:0 chroma subsampling and planar colour alignment is chosen for best compatibility. ![]() crf constant_rate_factor A parameter of 18 means a “visually lossless” compression. preset preset_value A slower encoding preset means a better compression rate. c:a copy \ output_file Command syntax ffmpeg starts the command -i input_file path, name and extension of the input file -c:v libx264 The library libx264 re-encodes the video stream using the H.264 video codec. ![]() c:a copy \ output_file Generic command ffmpeg \ Transcode a video file by using the H.264 codec for dissemination purposes.
0 Comments
Leave a Reply. |