====== FFmpeg ====== **FFmpeg** je kolekce svobodného softwaru umožňujícího nahrávání, konverzi a streamovaní digitálního zvuku (audia) a obrazu (videa).((Zdroj:https://cs.wikipedia.org/wiki/FFmpeg)) 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