FFmpeg je kolekce svobodného softwaru umožňujícího nahrávání, konverzi a streamovaní digitálního zvuku (audia) a obrazu (videa).1)
http://www.tecmint.com/ffmpeg-commands-for-video-audio-and-image-conversion-in-linux/
ffmpeg -i video.flv image%d.jpg ffmpeg -i video.flv video.mpg ffmpeg -i video.flv -vn -ar 44100 -ac 2 -ab 192 -f mp3 audio.mp3 ffmpeg -i video.flv animated.gif.mp4 ffmpeg -i video.avi -target pal-dvd -ps 2000000000 -aspect 16:9 video.mpeg ffmpeg -i video.mp4 -i subtitles.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast video-output.mkv
http://www.linuxandlife.com/2012/07/some-small-tricks-with-ffmpeg.html
ffmpeg -i input.avi -s 800x600 output.flv ffmpeg -vcodec copy -acodec copy -i input.avi -ss 00:00:25 -t 00:02:00 output.flv ffmpeg -i video.mp4 -r 15 -ss 00:00:30 -t 00:00:10 img%d.jpg
Konverze videa z DV kamery do avi
ffmpeg -i all_grabs.dv -s 720x406 -b 800k -acodec libmp3lame -ab 64k -vcodec mpeg4 -deinterlace -ar 44100 full_encoding.avi
Main options:
-L show license
-h show help
-version show version
-formats show available formats, codecs, protocols, ...
-f fmt force format
-img img_fmt force image format
-i filename input file name
-y overwrite output files
-t duration set the recording time
-fs limit_size set the limit file size
-ss time_off set the start time offset
-itsoffset time_off set the input ts offset
-title string set the title
-timestamp time set the timestamp
-author string set the author
-copyright string set the copyright
-comment string set the comment
-v verbose control amount of logging
-target type specify target file type ("vcd", "svcd", "dvd", "dv", "pal-vcd", "ntsc-svcd", ...)
-dframes number set the number of data frames to record
-hq activate high quality settings
-scodec codec force subtitle codec ('copy' to copy stream)
-newsubtitle add a new subtitle stream to the current output stream
-slang code set the ISO 639 language code (3 letters) of the current subtitle stream
Video options:
-b bitrate set video bitrate (in kbit/s)
-vframes number set the number of video frames to record
-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)
-fixaspect fix aspect ratio
-croptop size set top crop band size (in pixels)
-cropbottom size set bottom crop band size (in pixels)
-cropleft size set left crop band size (in pixels)
-cropright size set right crop band size (in pixels)
-padtop size set top pad band size (in pixels)
-padbottom size set bottom pad band size (in pixels)
-padleft size set left pad band size (in pixels)
-padright size set right pad band size (in pixels)
-padcolor color set color of pad bands (Hex 000000 thru FFFFFF)
-vn disable video
-bt tolerance set video bitrate tolerance (in kbit/s)
-maxrate bitrate set max video bitrate tolerance (in kbit/s)
-minrate bitrate set min video bitrate tolerance (in kbit/s)
-bufsize size set ratecontrol buffer size (in kByte)
-vcodec codec force video codec ('copy' to copy stream)
-sameq use same video quality as source (implies VBR)
-pass n select the pass number (1 or 2)
-passlogfile file select two pass log file name
-newvideo add a new video stream to the current output stream
Advanced Video options:
-pix_fmt format set pixel format
-g gop_size set the group of picture size
-intra use only intra frames
-vdt n discard threshold
-qscale q use fixed video quantiser scale (VBR)
-qmin q min video quantiser scale (VBR)
-qmax q max video quantiser scale (VBR)
-lmin lambda min video lagrange factor (VBR)
-lmax lambda max video lagrange factor (VBR)
-mblmin q min macroblock quantiser scale (VBR)
-mblmax q max macroblock quantiser scale (VBR)
-qdiff q max difference between the quantiser scale (VBR)
-qblur blur video quantiser scale blur (VBR)
-qsquish squish how to keep quantiser between qmin and qmax (0 = clip, 1 = use differentiable function)
-qcomp compression video quantiser scale compression (VBR)
-rc_init_cplx complexity initial complexity for 1-pass encoding
-b_qfactor factor qp factor between p and b frames
-i_qfactor factor qp factor between p and i frames
-b_qoffset offset qp offset between p and b frames
-i_qoffset offset qp offset between p and i frames
-ibias bias intra quant bias
-pbias bias inter quant bias
-rc_eq equation set rate control equation
-rc_override override rate control override for specific intervals
-me method set motion estimation method
-dct_algo algo set dct algo
-idct_algo algo set idct algo
-me_threshold motion estimaton threshold
-mb_threshold macroblock threshold
-er n set error resilience
-ec bit_mask set error concealment
-bf frames use 'frames' B frames
-mbd mode macroblock decision
-mbcmp cmp function macroblock compare function
-ildctcmp cmp function ildct compare function
-subcmp cmp function subpel compare function
-cmp cmp function fullpel compare function
-precmp cmp function pre motion estimation compare function
-preme pre motion estimation
-lelim elim single coefficient elimination threshold for luminance (negative values also consider DC coefficient)
-celim elim single coefficient elimination threshold for chrominance (negative values also consider DC coefficient)
-lumi_mask luminance masking
-dark_mask darkness masking
-scplx_mask spatial complexity masking
-tcplx_mask temporal complexity masking
-p_mask inter masking
-4mv use four motion vector by macroblock (MPEG4)
-obmc use overlapped block motion compensation (h263+)
-lf use loop filter (h263+)
-part use data partitioning (MPEG4)
-bug param workaround not auto detected encoder bugs
-strict strictness how strictly to follow the standards
-deinterlace deinterlace pictures
-ildct force interlaced dct support in encoder (MPEG2/MPEG4)
-ilme force interlaced me support in encoder (MPEG2/MPEG4)
-psnr calculate PSNR of compressed frames
-vstats dump video coding statistics to file
-vhook module insert video processing module
-aic enable Advanced intra coding (h263+)
-aiv enable Alternative inter vlc (h263+)
-umv enable Unlimited Motion Vector (h263+)
-ssm enable Slice Structured mode (h263+)
-alt enable alternate scantable (MPEG2/MPEG4)
-qprd
-cbp
-trell enable trellis quantization
-mv0 try to encode each MB with MV=<0,0> and choose the better one (has no effect if mbd=0)
-naq normalize adaptive quantization
-cgop closed gop
-sgop strict gop
-noout skip bitstream encoding
-scan_offset enable SVCD Scan Offset placeholder
-qpel enable 1/4-pel
-intra_matrix matrix specify intra matrix coeffs
-inter_matrix matrix specify inter matrix coeffs
-top top=1/bottom=0/auto=-1 field first
-nr noise reduction
-qns quantization noise shaping
-sc_threshold threshold scene change threshold
-me_range range limit motion vectors range (1023 for DivX player)
-dc precision intra_dc_precision
-coder coder type
-context context model
-pred prediction method
-vprofile profile
-vlevel level
-nssew weight
-subq
-mepc factor (1.0 = 256) motion estimation bitrate penalty compensation
-lowres
-vtag fourcc/tag force video tag/fourcc
-skip_threshold threshold frame skip threshold
-skip_factor factor frame skip factor
-skip_exp exponent frame skip exponent
-skip_cmp compare function frame skip compare function
-gray encode/decode grayscale
Audio options:
-aframes number set the number of audio frames to record
-ab bitrate set audio bitrate (in kbit/s)
-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)
-newaudio add a new audio stream to the current output stream
-alang code set the ISO 639 language code (3 letters) of the current audio stream
Advanced Audio options:
-atag fourcc/tag force audio tag/fourcc
Subtitle options:
-scodec codec force subtitle codec ('copy' to copy stream)
-newsubtitle add a new subtitle stream to the current output stream
-slang code set the ISO 639 language code (3 letters) of the current subtitle stream
Audio/Video grab options:
-vd device set video grab device
-vc channel set video grab channel (DV1394 only)
-tvstd standard set television standard (NTSC, PAL (SECAM))
-ad device set audio device
-grab format request grabbing using
-gd device set grab device
Advanced options:
-map file:stream[:syncfile:syncstream] set input stream mapping
-map_meta_data outfile:infile set meta data information of outfile from infile
-debug print specific debug info
-vismv visualize motion vectors
-benchmark add timings for benchmarking
-dump dump each input packet
-hex when dumping packets, also dump the payload
-bitexact only use bit exact algorithms (for codec testing)
-re read input at native frame rate
-loop loop (current only works with images)
-loop_output number of times to loop output in formats that support looping (0 loops forever)
-threads count thread count
-vsync video sync method
-async audio sync method
-vglobal video global header storage type
-copyts copy timestamps
-shortest finish encoding within shortest input
-b_strategy strategy dynamic b frame selection strategy
-ps size set packet size in bits
-error rate error rate
-muxrate rate set mux rate
-packetsize size set packet size
-muxdelay seconds set the maximum demux-decode delay
-muxpreload seconds set the initial demux-decode delay
-muxab bitrate set the audio bitrate in mux tag (in kbit/s)
-muxvb bitrate set the video bitrate in mux tag (in kbit/s)
Vypíše formáty:
ffmpeg -formats