ffmpeg -pix_fmts

1. ffmpeg -pix_fmts -loglevel quiet

显示ffmpeg支持的像素格式

2. 输出

选取部分输出结果

Pixel formats: I.... = Supported Input format for conversion .O... = Supported Output format for conversion ..H.. = Hardware accelerated format ...P. = Paletted format ....B = Bitstream format FLAGS NAME NB_COMPONENTS BITS_PER_PIXEL

IO... yuv420p 3 12

IO... yuyv422 3 16

IO... rgb24 3 24

IO... bgr24 3 24

IO... yuv422p 3 16

IO... yuv444p 3 24

IO... yuv410p 3 9

IO... yuv411p 3 12

IO... gray 1 8

3. 说明

输出选项中带I,表示输入的像素格式;带O,表示输出的像素格式;H:表示硬件加速支持的像素格式。第3列表示像素的通道数,第四列表示一个像素占用的比特数。

以yuv420p举例

IO... yuv420p 3 12

IO:表示输入输出都支持yuv420p格式

3:表示3通道

12:表示一个像素占用12位(bit),也就是1.5 = 12/8 字节;

关于yuv的理解可以参考 YUV格式-优快云博客

D:\>ffmpeg -h ffmpeg version N-94813-g85386c36e3-ffmpeg-for-N_m3u8DL-CLI Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8.2.0 (GCC) libavutil 56. 35.100 / 56. 35.100 libavcodec 58. 56.101 / 58. 56.101 libavformat 58. 32.104 / 58. 32.104 libavfilter 7. 58.102 / 7. 58.102 libavresample 4. 0. 0 / 4. 0. 0 libswresample 3. 6.100 / 3. 6.100 Hyper fast Audio and Video encoder usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}... Getting help: -h -- print basic options -h long -- print more options -h full -- print all options (including all format and codec specific options, very long) -h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter/bsf See man ffmpeg for detailed description of the options. Print help / information / capabilities: -L show license -h topic show help -? topic show help -help topic show help --help topic show help -version show version -buildconf show build configuration -formats show available formats -muxers show available muxers -demuxers show available demuxers -devices show available devices -codecs show available codecs -decoders show available decoders -encoders show available encoders -bsfs show available bit stream filters -protocols show available protocols -filters show available filters -pix_fmts show available pixel formats -layouts show standard channel layouts -sample_fmts show available audio sample formats -colors show available color names -hwaccels show available HW acceleration methods Global options (affect whole program instead of just one file: -loglevel loglevel set logging level -v loglevel set logging level -report generate a report -max_alloc bytes set maximum size of a single allocated block -y overwrite output files -n never overwrite output files -ignore_unknown Ignore unknown stream types -filter_threads number of non-complex filter threads -filter_complex_threads number of threads for -filter_complex -stats print progress report during encoding -max_error_rate maximum error rate ratio of errors (0.0: no errors, 1.0: 100% errors) above which ffmpeg returns an err or instead of success. -bits_per_raw_sample number set the number of bits per raw sample -vol volume change audio volume (256=normal) Per-file main options: -f fmt force format -c codec codec name -codec codec codec name -pre preset preset name -map_metadata outfile[,metadata]:infile[,metadata] set metadata information of outfile from infile -t duration record or transcode "duration" seconds of audio/video -to time_stop record or transcode stop time -fs limit_size set the limit file size in bytes -ss time_off set the start time offset -sseof time_off set the start time offset relative to EOF -seek_timestamp enable/disable seeking by timestamp with -ss -timestamp time set the recording timestamp ('now' to set the current time) -metadata string=string add metadata -program title=string:st=number... add program with specified streams -target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc- " or "film-") -apad audio pad -frames number set the number of frames to output -filter filter_graph set stream filtergraph -filter_script filename read stream filtergraph description from a file -reinit_filter reinit filtergraph on input parameter changes -discard discard -disposition disposition Video options: -vframes number set the number of video frames to output -r rate set frame rate (Hz value, fraction or abbreviation) -s size set frame size (WxH or abbreviation) -aspect aspect set aspect ratio (4:3, 16:9 or 1.3333, 1.7777) -bits_per_raw_sample number set the number of bits per raw sample -vn disable video -vcodec codec force video codec ('copy' to copy stream) -timecode hh:mm:ss[:;.]ff set initial TimeCode value. -pass n select the pass number (1 to 3) -vf filter_graph set video filters -ab bitrate audio bitrate (please use -b:a) -b bitrate video bitrate (please use -b:v) -dn disable data Audio options: -aframes number set the number of audio frames to output -aq quality set audio quality (codec-specific) -ar rate set audio sampling rate (in Hz) -ac channels set number of audio channels -an disable audio -acodec codec force audio codec ('copy' to copy stream) -vol volume change audio volume (256=normal) -af filter_graph set audio filters Subtitle options: -s size set frame size (WxH or abbreviation) -sn disable subtitle -scodec codec force subtitle codec ('copy' to copy stream) -stag fourcc/tag force subtitle tag/fourcc -fix_sub_duration fix subtitles duration -canvas_size size set canvas size (WxH or abbreviation) -spre preset set the subtitle options to the indicated preset。翻译一下
最新发布
09-11
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