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使用ffmpeg进行视频转码,剪切,合并与调速

视频转码

视频转码最简单的命令就是

ffmpeg -i ${infile} -vcodec ${outcodec} ${outfile}

其中 -vcodec 后面是编码格式,可以用 ffmpeg -codecs 来查看

ffmpeg -codecs
Codecs:
 D..... = Decoding supported
 .E.... = Encoding supported
 ..V... = Video codec
 ..A... = Audio codec
 ..S... = Subtitle codec
 ...I.. = Intra frame-only codec
 ....L. = Lossy compression
 .....S = Lossless compression
 -------
 D.VI.S 012v                 Uncompressed 4:2:2 10-bit
 D.V.L. 4xm                  4X Movie
 D.VI.S 8bps                 QuickTime 8BPS video
 .EVIL. a64_multi            Multicolor charset for Commodore 64 (encoders: a64multi )
 .EVIL. a64_multi5           Multicolor charset for Commodore 64, extended with 5th color (colram) (encoders: a64multi5 )
 D.V..S aasc                 Autodesk RLE
 D.VIL. aic                  Apple Intermediate Codec
 DEVI.S alias_pix            Alias/Wavefront PIX image
 DEVIL. amv                  AMV Video
 D.V.L. anm                  Deluxe Paint Animation
 D.V.L. ansi                 ASCII/ANSI art
 DEV..S apng                 APNG (Animated Portable Network Graphics) image
 DEVIL. asv1                 ASUS V1
 DEVIL. asv2                 ASUS V2
 D.VIL. aura                 Auravision AURA
 D.VIL. aura2                Auravision Aura 2
 ..V.L. av1                  Alliance for Open Media AV1
 D.V... avrn                 Avid AVI Codec
 DEVI.S avrp                 Avid 1:1 10-bit RGB Packer
 D.V.L. avs                  AVS (Audio Video Standard) video
 DEVI.S avui                 Avid Meridien Uncompressed
 DEVI.S ayuv                 Uncompressed packed MS 4:4:4:4
 D.V.L. bethsoftvid          Bethesda VID video
 D.V.L. bfi                  Brute Force & Ignorance
 D.V.L. binkvideo            Bink video
 D.VI.. bintext              Binary text
 D.VI.S bitpacked            Bitpacked
 DEVI.S bmp                  BMP (Windows and OS/2 bitmap)
 D.V..S bmv_video            Discworld II BMV video
 D.VI.S brender_pix          BRender PIX image
 D.V.L. c93                  Interplay C93
 D.V.L. cavs                 Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)
 D.V.L. cdgraphics           CD Graphics video
 D.VIL. cdxl                 Commodore CDXL video
 D.V.L. cfhd                 Cineform HD
 DEV.L. cinepak              Cinepak
 D.V.L. clearvideo           Iterated Systems ClearVideo
 DEVIL. cljr                 Cirrus Logic AccuPak
 D.VI.S cllc                 Canopus Lossless Codec
 D.V.L. cmv                  Electronic Arts CMV video (decoders: eacmv )
 D.V... cpia                 CPiA video format
 D.V..S cscd                 CamStudio (decoders: camstudio )
 D.VIL. cyuv                 Creative YUV (CYUV)
 ..V.LS daala                Daala
 D.VILS dds                  DirectDraw Surface image decoder
 D.V.L. dfa                  Chronomaster DFA
 DEV.LS dirac                Dirac (encoders: vc2 )
 DEVIL. dnxhd                VC3/DNxHD
 DEVI.S dpx                  DPX (Digital Picture Exchange) image
 D.V.L. dsicinvideo          Delphine Software International CIN video
 DEVIL. dvvideo              DV (Digital Video)
 D.V..S dxa                  Feeble Files/ScummVM DXA
 D.VI.S dxtory               Dxtory
 D.VIL. dxv                  Resolume DXV
 D.V.L. escape124            Escape 124
 D.V.L. escape130            Escape 130
 D.VILS exr                  OpenEXR image
 DEV..S ffv1                 FFmpeg video codec #1
 DEVI.S ffvhuff              Huffyuv FFmpeg variant
 D.V.L. fic                  Mirillis FIC
 DEVI.S fits                 FITS (Flexible Image Transport System)
 DEV..S flashsv              Flash Screen Video v1
 DEV.L. flashsv2             Flash Screen Video v2
 D.V..S flic                 Autodesk Animator Flic video
 DEV.L. flv1                 FLV / Sorenson Spark / Sorenson H.263 (Flash Video) (decoders: flv ) (encoders: flv )
 D.V..S fmvc                 FM Screen Capture Codec
 D.VI.S fraps                Fraps
 D.VI.S frwu                 Forward Uncompressed
 D.V.L. g2m                  Go2Meeting
 D.V.L. gdv                  Gremlin Digital Video
 DEV..S gif                  GIF (Graphics Interchange Format)
 DEV.L. h261                 H.261
 DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2 (decoders: h263 h263_v4l2m2m ) (encoders: h263 h263_v4l2m2m )
 D.V.L. h263i                Intel H.263
 DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m h264_cuvid ) (encoders: libx264 libx264rgb h264_nvenc h264_omx h264_v4l2m2m h264_vaapi nvenc nvenc_h264 )
 D.VIL. hap                  Vidvox Hap
 DEV.L. hevc                 H.265 / HEVC (High Efficiency Video Coding) (decoders: hevc hevc_cuvid ) (encoders: libx265 nvenc_hevc hevc_nvenc hevc_vaapi )
 D.V.L. hnm4video            HNM 4 video
 D.VIL. hq_hqa               Canopus HQ/HQA
 D.VIL. hqx                  Canopus HQX
 DEVI.S huffyuv              HuffYUV
 D.V.L. idcin                id Quake II CIN video (decoders: idcinvideo )
 D.VI.. idf                  iCEDraw text
 D.V.L. iff_ilbm             IFF ACBM/ANIM/DEEP/ILBM/PBM/RGB8/RGBN (decoders: iff )
 D.V.L. indeo2               Intel Indeo 2
 D.V.L. indeo3               Intel Indeo 3
 D.V.L. indeo4               Intel Indeo Video Interactive 4
 D.V.L. indeo5               Intel Indeo Video Interactive 5
 D.V.L. interplayvideo       Interplay MVE video
 DEVILS jpeg2000             JPEG 2000 (decoders: jpeg2000 libopenjpeg ) (encoders: jpeg2000 libopenjpeg )
 DEVILS jpegls               JPEG-LS
 D.VIL. jv                   Bitmap Brothers JV video
 D.V.L. kgv1                 Kega Game Video
 D.V.L. kmvc                 Karl Morton's video codec
 D.VI.S lagarith             Lagarith lossless
 .EVI.S ljpeg                Lossless JPEG
 D.VI.S loco                 LOCO
 D.VI.S m101                 Matrox Uncompressed SD
 D.V.L. mad                  Electronic Arts Madcow Video (decoders: eamad )
 DEVI.S magicyuv             MagicYUV video
 D.VIL. mdec                 Sony PlayStation MDEC (Motion DECoder)
 D.V.L. mimic                Mimic
 DEVIL. mjpeg                Motion JPEG (decoders: mjpeg mjpeg_cuvid ) (encoders: mjpeg mjpeg_vaapi )
 D.VIL. mjpegb               Apple MJPEG-B
 D.V.L. mmvideo              American Laser Games MM Video
 D.V.L. motionpixels         Motion Pixels video
 DEV.L. mpeg1video           MPEG-1 video (decoders: mpeg1video mpeg1_v4l2m2m mpeg1_cuvid )
 DEV.L. mpeg2video           MPEG-2 video (decoders: mpeg2video mpegvideo mpeg2_v4l2m2m mpeg2_cuvid ) (encoders: mpeg2video mpeg2_vaapi )
 DEV.L. mpeg4                MPEG-4 part 2 (decoders: mpeg4 mpeg4_v4l2m2m mpeg4_cuvid ) (encoders: mpeg4 libxvid mpeg4_v4l2m2m )
 D.V.L. msa1                 MS ATC Screen
 D.VI.S mscc                 Mandsoft Screen Capture Codec
 D.V.L. msmpeg4v1            MPEG-4 part 2 Microsoft variant version 1
 DEV.L. msmpeg4v2            MPEG-4 part 2 Microsoft variant version 2
 DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4 ) (encoders: msmpeg4 )
 D.V..S msrle                Microsoft RLE
 D.V.L. mss1                 MS Screen 1
 D.VIL. mss2                 MS Windows Media Video V9 Screen
 DEV.L. msvideo1             Microsoft Video 1
 D.VI.S mszh                 LCL (LossLess Codec Library) MSZH
 D.V.L. mts2                 MS Expression Encoder Screen
 D.VIL. mvc1                 Silicon Graphics Motion Video Compressor 1
 D.VIL. mvc2                 Silicon Graphics Motion Video Compressor 2
 D.V.L. mxpeg                Mobotix MxPEG video
 D.V.L. nuv                  NuppelVideo/RTJPEG
 D.V.L. paf_video            Amazing Studio Packed Animation File Video
 DEVI.S pam                  PAM (Portable AnyMap) image
 DEVI.S pbm                  PBM (Portable BitMap) image
 DEVI.S pcx                  PC Paintbrush PCX image
 DEVI.S pgm                  PGM (Portable GrayMap) image
 DEVI.S pgmyuv               PGMYUV (Portable GrayMap YUV) image
 D.VIL. pictor               Pictor/PC Paint
 D.VIL. pixlet               Apple Pixlet
 DEV..S png                  PNG (Portable Network Graphics) image
 DEVI.S ppm                  PPM (Portable PixelMap) image
 DEVIL. prores               Apple ProRes (iCodec Pro) (decoders: prores prores_lgpl ) (encoders: prores prores_aw prores_ks )
 D.VI.S psd                  Photoshop PSD file
 D.VIL. ptx                  V.Flash PTX image
 D.VI.S qdraw                Apple QuickDraw
 D.V.L. qpeg                 Q-team QPEG
 DEV..S qtrle                QuickTime Animation (RLE) video
 DEVI.S r10k                 AJA Kona 10-bit RGB Codec
 DEVI.S r210                 Uncompressed RGB 10-bit
 DEVI.S rawvideo             raw video
 D.VIL. rl2                  RL2 video
 DEV.L. roq                  id RoQ video (decoders: roqvideo ) (encoders: roqvideo )
 D.V.L. rpza                 QuickTime video (RPZA)
 D.V..S rscc                 innoHeim/Rsupport Screen Capture Codec
 DEV.L. rv10                 RealVideo 1.0
 DEV.L. rv20                 RealVideo 2.0
 D.V.L. rv30                 RealVideo 3.0
 D.V.L. rv40                 RealVideo 4.0
 D.V.L. sanm                 LucasArts SANM/SMUSH video
 D.V.LS scpr                 ScreenPressor
 D.V..S screenpresso         Screenpresso
 DEVI.S sgi                  SGI image
 D.VI.S sgirle               SGI RLE 8-bit
 D.VI.S sheervideo           BitJazz SheerVideo
 D.V.L. smackvideo           Smacker video (decoders: smackvid )
 D.V.L. smc                  QuickTime Graphics (SMC)
 D.V... smvjpeg              Sigmatel Motion Video
 DEV.LS snow                 Snow
 D.VIL. sp5x                 Sunplus JPEG (SP5X)
 D.VIL. speedhq              NewTek SpeedHQ
 D.VI.S srgc                 Screen Recorder Gold Codec
 DEVI.S sunrast              Sun Rasterfile image
 ..V..S svg                  Scalable Vector Graphics
 DEV.L. svq1                 Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1
 D.V.L. svq3                 Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3
 DEVI.S targa                Truevision Targa image
 D.VI.S targa_y216           Pinnacle TARGA CineWave YUV16
 D.V.L. tdsc                 TDSC
 D.V.L. tgq                  Electronic Arts TGQ video (decoders: eatgq )
 D.V.L. tgv                  Electronic Arts TGV video (decoders: eatgv )
 DEV.L. theora               Theora (encoders: libtheora )
 D.VIL. thp                  Nintendo Gamecube THP video
 D.V.L. tiertexseqvideo      Tiertex Limited SEQ video
 DEVI.S tiff                 TIFF image
 D.VIL. tmv                  8088flex TMV
 D.V.L. tqi                  Electronic Arts TQI video (decoders: eatqi )
 D.V.L. truemotion1          Duck TrueMotion 1.0
 D.V.L. truemotion2          Duck TrueMotion 2.0
 D.V.L. truemotion2rt        Duck TrueMotion 2.0 Real Time
 D.V..S tscc                 TechSmith Screen Capture Codec (decoders: camtasia )
 D.V.L. tscc2                TechSmith Screen Codec 2
 D.VIL. txd                  Renderware TXD (TeXture Dictionary) image
 D.V.L. ulti                 IBM UltiMotion (decoders: ultimotion )
 DEVI.S utvideo              Ut Video
 DEVI.S v210                 Uncompressed 4:2:2 10-bit
 D.VI.S v210x                Uncompressed 4:2:2 10-bit
 DEVI.S v308                 Uncompressed packed 4:4:4
 DEVI.S v408                 Uncompressed packed QT 4:4:4:4
 DEVI.S v410                 Uncompressed 4:4:4 10-bit
 D.V.L. vb                   Beam Software VB
 D.VI.S vble                 VBLE Lossless Codec
 D.V.L. vc1                  SMPTE VC-1 (decoders: vc1 vc1_v4l2m2m vc1_cuvid )
 D.V.L. vc1image             Windows Media Video 9 Image v2
 D.VIL. vcr1                 ATI VCR1
 D.VIL. vixl                 Miro VideoXL (decoders: xl )
 D.V.L. vmdvideo             Sierra VMD video
 D.V..S vmnc                 VMware Screen Codec / VMware Video
 D.V.L. vp3                  On2 VP3
 D.V.L. vp5                  On2 VP5
 D.V.L. vp6                  On2 VP6
 D.V.L. vp6a                 On2 VP6 (Flash version, with alpha channel)
 D.V.L. vp6f                 On2 VP6 (Flash version)
 D.V.L. vp7                  On2 VP7
 DEV.L. vp8                  On2 VP8 (decoders: vp8 vp8_v4l2m2m libvpx vp8_cuvid ) (encoders: libvpx vp8_v4l2m2m vp8_vaapi )
 DEV.L. vp9                  Google VP9 (decoders: vp9 vp9_v4l2m2m libvpx-vp9 vp9_cuvid ) (encoders: libvpx-vp9 vp9_vaapi )
 DEVILS webp                 WebP (encoders: libwebp_anim libwebp )
 DEV.L. wmv1                 Windows Media Video 7
 DEV.L. wmv2                 Windows Media Video 8
 D.V.L. wmv3                 Windows Media Video 9
 D.V.L. wmv3image            Windows Media Video 9 Image
 D.VIL. wnv1                 Winnov WNV1
 DEV..S wrapped_avframe      AVFrame to AVPacket passthrough
 D.V.L. ws_vqa               Westwood Studios VQA (Vector Quantized Animation) video (decoders: vqavideo )
 D.V.L. xan_wc3              Wing Commander III / Xan
 D.V.L. xan_wc4              Wing Commander IV / Xxan
 D.VI.. xbin                 eXtended BINary text
 DEVI.S xbm                  XBM (X BitMap) image
 DEVIL. xface                X-face image
 D.VI.S xpm                  XPM (X PixMap) image
 DEVI.S xwd                  XWD (X Window Dump) image
 DEVI.S y41p                 Uncompressed YUV 4:1:1 12-bit
 D.VI.S ylc                  YUY2 Lossless Codec
 D.V.L. yop                  Psygnosis YOP Video
 DEVI.S yuv4                 Uncompressed packed 4:2:0
 D.V..S zerocodec            ZeroCodec Lossless Video
 DEVI.S zlib                 LCL (LossLess Codec Library) ZLIB
 DEV..S zmbv                 Zip Motion Blocks Video
 ..A.L. 4gv                  4GV (Fourth Generation Vocoder)
 D.A.L. 8svx_exp             8SVX exponential
 D.A.L. 8svx_fib             8SVX fibonacci
 DEA.L. aac                  AAC (Advanced Audio Coding) (decoders: aac aac_fixed )
 D.A.L. aac_latm             AAC LATM (Advanced Audio Coding LATM syntax)
 DEA.L. ac3                  ATSC A/52A (AC-3) (decoders: ac3 ac3_fixed ) (encoders: ac3 ac3_fixed )
 D.A.L. adpcm_4xm            ADPCM 4X Movie
 DEA.L. adpcm_adx            SEGA CRI ADX ADPCM
 D.A.L. adpcm_afc            ADPCM Nintendo Gamecube AFC
 D.A.L. adpcm_aica           ADPCM Yamaha AICA
 D.A.L. adpcm_ct             ADPCM Creative Technology
 D.A.L. adpcm_dtk            ADPCM Nintendo Gamecube DTK
 D.A.L. adpcm_ea             ADPCM Electronic Arts
 D.A.L. adpcm_ea_maxis_xa    ADPCM Electronic Arts Maxis CDROM XA
 D.A.L. adpcm_ea_r1          ADPCM Electronic Arts R1
 D.A.L. adpcm_ea_r2          ADPCM Electronic Arts R2
 D.A.L. adpcm_ea_r3          ADPCM Electronic Arts R3
 D.A.L. adpcm_ea_xas         ADPCM Electronic Arts XAS
 DEA.L. adpcm_g722           G.722 ADPCM (decoders: g722 ) (encoders: g722 )
 DEA.L. adpcm_g726           G.726 ADPCM (decoders: g726 ) (encoders: g726 )
 DEA.L. adpcm_g726le         G.726 ADPCM little-endian (decoders: g726le ) (encoders: g726le )
 D.A.L. adpcm_ima_amv        ADPCM IMA AMV
 D.A.L. adpcm_ima_apc        ADPCM IMA CRYO APC
 D.A.L. adpcm_ima_dat4       ADPCM IMA Eurocom DAT4
 D.A.L. adpcm_ima_dk3        ADPCM IMA Duck DK3
 D.A.L. adpcm_ima_dk4        ADPCM IMA Duck DK4
 D.A.L. adpcm_ima_ea_eacs    ADPCM IMA Electronic Arts EACS
 D.A.L. adpcm_ima_ea_sead    ADPCM IMA Electronic Arts SEAD
 D.A.L. adpcm_ima_iss        ADPCM IMA Funcom ISS
 D.A.L. adpcm_ima_oki        ADPCM IMA Dialogic OKI
 DEA.L. adpcm_ima_qt         ADPCM IMA QuickTime
 D.A.L. adpcm_ima_rad        ADPCM IMA Radical
 D.A.L. adpcm_ima_smjpeg     ADPCM IMA Loki SDL MJPEG
 DEA.L. adpcm_ima_wav        ADPCM IMA WAV
 D.A.L. adpcm_ima_ws         ADPCM IMA Westwood
 DEA.L. adpcm_ms             ADPCM Microsoft
 D.A.L. adpcm_mtaf           ADPCM MTAF
 D.A.L. adpcm_psx            ADPCM Playstation
 D.A.L. adpcm_sbpro_2        ADPCM Sound Blaster Pro 2-bit
 D.A.L. adpcm_sbpro_3        ADPCM Sound Blaster Pro 2.6-bit
 D.A.L. adpcm_sbpro_4        ADPCM Sound Blaster Pro 4-bit
 DEA.L. adpcm_swf            ADPCM Shockwave Flash
 D.A.L. adpcm_thp            ADPCM Nintendo THP
 D.A.L. adpcm_thp_le         ADPCM Nintendo THP (Little-Endian)
 D.A.L. adpcm_vima           LucasArts VIMA audio
 D.A.L. adpcm_xa             ADPCM CDROM XA
 DEA.L. adpcm_yamaha         ADPCM Yamaha
 DEAI.S alac                 ALAC (Apple Lossless Audio Codec)
 DEA.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb libopencore_amrnb ) (encoders: libopencore_amrnb )
 D.A.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb libopencore_amrwb )
 D.A..S ape                  Monkey's Audio
 DEA.L. aptx                 aptX (Audio Processing Technology for Bluetooth)
 DEA.L. aptx_hd              aptX HD (Audio Processing Technology for Bluetooth)
 D.A.L. atrac1               ATRAC1 (Adaptive TRansform Acoustic Coding)
 D.A.L. atrac3               ATRAC3 (Adaptive TRansform Acoustic Coding 3)
 D.A..S atrac3al             ATRAC3 AL (Adaptive TRansform Acoustic Coding 3 Advanced Lossless)
 D.A.L. atrac3p              ATRAC3+ (Adaptive TRansform Acoustic Coding 3+) (decoders: atrac3plus )
 D.A..S atrac3pal            ATRAC3+ AL (Adaptive TRansform Acoustic Coding 3+ Advanced Lossless) (decoders: atrac3plusal )
 D.A.L. avc                  On2 Audio for Video Codec (decoders: on2avc )
 D.A.L. binkaudio_dct        Bink Audio (DCT)
 D.A.L. binkaudio_rdft       Bink Audio (RDFT)
 D.A.L. bmv_audio            Discworld II BMV audio
 ..A.L. celt                 Constrained Energy Lapped Transform (CELT)
 ..A.L. codec2               codec2 (very low bitrate speech codec)
 DEA.L. comfortnoise         RFC 3389 Comfort Noise
 D.A.L. cook                 Cook / Cooker / Gecko (RealAudio G2)
 D.A.L. dolby_e              Dolby E
 D.A.L. dsd_lsbf             DSD (Direct Stream Digital), least significant bit first
 D.A.L. dsd_lsbf_planar      DSD (Direct Stream Digital), least significant bit first, planar
 D.A.L. dsd_msbf             DSD (Direct Stream Digital), most significant bit first
 D.A.L. dsd_msbf_planar      DSD (Direct Stream Digital), most significant bit first, planar
 D.A.L. dsicinaudio          Delphine Software International CIN audio
 D.A.L. dss_sp               Digital Speech Standard - Standard Play mode (DSS SP)
 D.A..S dst                  DST (Direct Stream Transfer)
 DEA.LS dts                  DCA (DTS Coherent Acoustics) (decoders: dca ) (encoders: dca )
 D.A.L. dvaudio              DV audio
 DEA.L. eac3                 ATSC A/52B (AC-3, E-AC-3)
 D.A.L. evrc                 EVRC (Enhanced Variable Rate Codec)
 DEAI.S flac                 FLAC (Free Lossless Audio Codec)
 DEA.L. g723_1               G.723.1
 D.A.L. g729                 G.729
 D.A.L. gremlin_dpcm         DPCM Gremlin
 DEA.L. gsm                  GSM (decoders: gsm libgsm ) (encoders: libgsm )
 DEA.L. gsm_ms               GSM Microsoft variant (decoders: gsm_ms libgsm_ms ) (encoders: libgsm_ms )
 D.A.L. iac                  IAC (Indeo Audio Coder)
 ..A.L. ilbc                 iLBC (Internet Low Bitrate Codec)
 D.A.L. imc                  IMC (Intel Music Coder)
 D.A.L. interplay_dpcm       DPCM Interplay
 D.A.L. interplayacm         Interplay ACM
 D.A.L. mace3                MACE (Macintosh Audio Compression/Expansion) 3:1
 D.A.L. mace6                MACE (Macintosh Audio Compression/Expansion) 6:1
 D.A.L. metasound            Voxware MetaSound
 DEA..S mlp                  MLP (Meridian Lossless Packing)
 D.A.L. mp1                  MP1 (MPEG audio layer 1) (decoders: mp1 mp1float )
 DEA.L. mp2                  MP2 (MPEG audio layer 2) (decoders: mp2 mp2float ) (encoders: mp2 mp2fixed )
 DEA.L. mp3                  MP3 (MPEG audio layer 3) (decoders: mp3float mp3 ) (encoders: libmp3lame )
 D.A.L. mp3adu               ADU (Application Data Unit) MP3 (MPEG audio layer 3) (decoders: mp3adufloat mp3adu )
 D.A.L. mp3on4               MP3onMP4 (decoders: mp3on4float mp3on4 )
 D.A..S mp4als               MPEG-4 Audio Lossless Coding (ALS) (decoders: als )
 D.A.L. musepack7            Musepack SV7 (decoders: mpc7 )
 D.A.L. musepack8            Musepack SV8 (decoders: mpc8 )
 DEA.L. nellymoser           Nellymoser Asao
 DEA.L. opus                 Opus (Opus Interactive Audio Codec) (decoders: opus libopus ) (encoders: opus libopus )
 D.A.L. paf_audio            Amazing Studio Packed Animation File Audio
 DEA.L. pcm_alaw             PCM A-law / G.711 A-law
 D.A..S pcm_bluray           PCM signed 16|20|24-bit big-endian for Blu-ray media
 D.A..S pcm_dvd              PCM signed 20|24-bit big-endian
 D.A..S pcm_f16le            PCM 16.8 floating point little-endian
 D.A..S pcm_f24le            PCM 24.0 floating point little-endian
 DEA..S pcm_f32be            PCM 32-bit floating point big-endian
 DEA..S pcm_f32le            PCM 32-bit floating point little-endian
 DEA..S pcm_f64be            PCM 64-bit floating point big-endian
 DEA..S pcm_f64le            PCM 64-bit floating point little-endian
 D.A..S pcm_lxf              PCM signed 20-bit little-endian planar
 DEA.L. pcm_mulaw            PCM mu-law / G.711 mu-law
 DEA..S pcm_s16be            PCM signed 16-bit big-endian
 DEA..S pcm_s16be_planar     PCM signed 16-bit big-endian planar
 DEA..S pcm_s16le            PCM signed 16-bit little-endian
 DEA..S pcm_s16le_planar     PCM signed 16-bit little-endian planar
 DEA..S pcm_s24be            PCM signed 24-bit big-endian
 DEA..S pcm_s24daud          PCM D-Cinema audio signed 24-bit
 DEA..S pcm_s24le            PCM signed 24-bit little-endian
 DEA..S pcm_s24le_planar     PCM signed 24-bit little-endian planar
 DEA..S pcm_s32be            PCM signed 32-bit big-endian
 DEA..S pcm_s32le            PCM signed 32-bit little-endian
 DEA..S pcm_s32le_planar     PCM signed 32-bit little-endian planar
 DEA..S pcm_s64be            PCM signed 64-bit big-endian
 DEA..S pcm_s64le            PCM signed 64-bit little-endian
 DEA..S pcm_s8               PCM signed 8-bit
 DEA..S pcm_s8_planar        PCM signed 8-bit planar
 DEA..S pcm_u16be            PCM unsigned 16-bit big-endian
 DEA..S pcm_u16le            PCM unsigned 16-bit little-endian
 DEA..S pcm_u24be            PCM unsigned 24-bit big-endian
 DEA..S pcm_u24le            PCM unsigned 24-bit little-endian
 DEA..S pcm_u32be            PCM unsigned 32-bit big-endian
 DEA..S pcm_u32le            PCM unsigned 32-bit little-endian
 DEA..S pcm_u8               PCM unsigned 8-bit
 D.A.L. pcm_zork             PCM Zork
 D.A.L. qcelp                QCELP / PureVoice
 D.A.L. qdm2                 QDesign Music Codec 2
 D.A.L. qdmc                 QDesign Music
 DEA.L. ra_144               RealAudio 1.0 (14.4K) (decoders: real_144 ) (encoders: real_144 )
 D.A.L. ra_288               RealAudio 2.0 (28.8K) (decoders: real_288 )
 D.A..S ralf                 RealAudio Lossless
 DEA.L. roq_dpcm             DPCM id RoQ
 DEA..S s302m                SMPTE 302M
 DEA.L. sbc                  SBC (low-complexity subband codec)
 D.A.L. sdx2_dpcm            DPCM Squareroot-Delta-Exact
 D.A..S shorten              Shorten
 D.A.L. sipr                 RealAudio SIPR / ACELP.NET
 D.A.L. smackaudio           Smacker audio (decoders: smackaud )
 ..A.L. smv                  SMV (Selectable Mode Vocoder)
 D.A.L. sol_dpcm             DPCM Sol
 DEA... sonic                Sonic
 .EA... sonicls              Sonic lossless
 DEA.L. speex                Speex (decoders: libspeex ) (encoders: libspeex )
 D.AI.S tak                  TAK (Tom's lossless Audio Kompressor)
 DEA..S truehd               TrueHD
 D.A.L. truespeech           DSP Group TrueSpeech
 DEAI.S tta                  TTA (True Audio)
 D.A.L. twinvq               VQF TwinVQ
 D.A.L. vmdaudio             Sierra VMD audio
 DEA.L. vorbis               Vorbis (decoders: vorbis libvorbis ) (encoders: vorbis libvorbis )
 D.A... wavesynth            Wave synthesis pseudo-codec
 DEAILS wavpack              WavPack
 D.A.L. westwood_snd1        Westwood Audio (SND1) (decoders: ws_snd1 )
 D.A..S wmalossless          Windows Media Audio Lossless
 D.A.L. wmapro               Windows Media Audio 9 Professional
 DEA.L. wmav1                Windows Media Audio 1
 DEA.L. wmav2                Windows Media Audio 2
 D.A.L. wmavoice             Windows Media Audio Voice
 D.A.L. xan_dpcm             DPCM Xan
 D.A.L. xma1                 Xbox Media Audio 1
 D.A.L. xma2                 Xbox Media Audio 2
 ..D... bin_data             binary data
 ..D... dvd_nav_packet       DVD Nav packet
 ..D... klv                  SMPTE 336M Key-Length-Value (KLV) metadata
 ..D... otf                  OpenType font
 ..D... scte_35              SCTE 35 Message Queue
 ..D... timed_id3            timed ID3 metadata
 ..D... ttf                  TrueType font
 DES... ass                  ASS (Advanced SSA) subtitle (decoders: ssa ass ) (encoders: ssa ass )
 DES... dvb_subtitle         DVB subtitles (decoders: dvbsub ) (encoders: dvbsub )
 ..S... dvb_teletext         DVB teletext
 DES... dvd_subtitle         DVD subtitles (decoders: dvdsub ) (encoders: dvdsub )
 D.S... eia_608              EIA-608 closed captions (decoders: cc_dec )
 D.S... hdmv_pgs_subtitle    HDMV Presentation Graphic Stream subtitles (decoders: pgssub )
 ..S... hdmv_text_subtitle   HDMV Text subtitle
 D.S... jacosub              JACOsub subtitle
 D.S... microdvd             MicroDVD subtitle
 DES... mov_text             MOV text
 D.S... mpl2                 MPL2 subtitle
 D.S... pjs                  PJS (Phoenix Japanimation Society) subtitle
 D.S... realtext             RealText subtitle
 D.S... sami                 SAMI subtitle
 ..S... srt                  SubRip subtitle with embedded timing
 ..S... ssa                  SSA (SubStation Alpha) subtitle
 D.S... stl                  Spruce subtitle format
 DES... subrip               SubRip subtitle (decoders: srt subrip ) (encoders: srt subrip )
 D.S... subviewer            SubViewer subtitle
 D.S... subviewer1           SubViewer v1 subtitle
 DES... text                 raw UTF-8 text
 D.S... vplayer              VPlayer subtitle
 DES... webvtt               WebVTT subtitle
 DES... xsub                 XSUB

注意第三行 .E.... = Encoding supported,说明带有 E 标志的才是支持转出的编码格式.

我们也可以通过一些附加选项指定转换规则:

-r
指定帧率
-s
指定分辨率
-b
指定比特率;于此同时可以对声道进行转码
-acodec
指定音频编码
-ab
指定音频比特率
-ac
指定声道数

比如:

ffmpeg -i 01.mp4 -s 640x480 -b:v 500k -vcodec h264 -r 29.97  -ab 48k -ac 2 out.mp4

视频剪切

视频剪切可以认为是一种特殊的视频转换过程,不过它不需要经过decode再encode的过程,而是可以直接进行流拷贝。

使用ffmpeg进行流拷贝可以通过 -c copy 参数来进行。

既然是视频剪切当然就需要指定剪切的开始位置和结束位置了,可以使用 -ss 参数指定开始位置,使用 -t 参数指定截取时间长度,或者使用 -to 参数指定截取的结束位置

比如下面命令截取从30秒开始,持续10秒钟的内容

ffmpeg -i input.wmv -ss 00:00:30.0 -c copy -t 10 output.wmv

视频合并

视频合并要求被合并的文件格式是一样的,否则需要先将它们转换成统一的中间格式。

然后将将所有要合并的视频,每个视频一行,将视频文件的路径存在一个列表文件中,然后执行

ffmpeg -f concat -i ${listfile} -c copy ${outfile}

视频调速

通过设置video filter来实现,比如

加速四倍:

ffmpeg -i TheOrigin.mp4 -vf  "setpts=0.25*PTS" UpTheOrigin.mp4

四倍慢速:

ffmpeg -i TheOrigin.mp4 -vf  "setpts=4*PTS" DownTheOrigin.mp4