FFmpeg

FFmpeg

FFmpeg running on Microsoft Windows
Original author(s)	Fabrice Bellard
Developer(s)	FFmpeg team
Initial release	December 20, 2000[1]
Stable release	3.2.1 (November 26, 2016[2]) [±]
Preview release	Git [±]
Repository	git.ffmpeg.org/ffmpeg.git
Development status	Active
Written in	C and Assembly[3]
Operating system	Windows, OS X, and Linux; may be compiled for other OSes.[4]
Platform	x86, ARM, PowerPC, MIPS, DEC Alpha, Blackfin, AVR32, SH-4, and SPARC; may be compiled for other desktop computers
Type	Multimedia framework
License	LGPL 2.1+, GPL 2+ Unredistributable if compiled as such[5]
Website	ffmpeg.org

FFmpeg is a free software project that produces libraries and programs for handling multimedia data. FFmpeg includes libavcodec, an audio/video codec library used by several other projects, libavformat (Lavf),^[6] an audio/video container mux and demux library, and the ffmpeg command line program for transcoding multimedia files. FFmpeg is published under the GNU Lesser General Public License 2.1+ or GNU General Public License 2+ (depending on which options are enabled).^[7]

The name of the project is inspired by the MPEG video standards group, together with "FF" for "fast forward".^[8] The logo uses a zigzag pattern that shows how MPEG video codecs handle entropy encoding.^[9]

History

The project was started by Fabrice Bellard^[7] (using the pseudonym "Gérard Lantau") in 2000, and was led by Michael Niedermayer from 2004 until 2015.^[10] Some FFmpeg developers were also part of the MPlayer project.

The project publishes a new release every three months on average. While release versions are available from the website for download, FFmpeg developers recommend that users compile the software from source using the latest build from their source code Git version control system.^[11]

On January 10, 2014, two Google employees announced that over 1000 bugs had been fixed in FFmpeg during the previous two years by means of fuzz testing.^[12]

Codec history

Two video coding formats with corresponding codecs and one container format have been created within the FFmpeg project so far. The two video codecs are the lossless FFV1, and the lossless and lossy Snow codec. Development of Snow has stalled, while its bit-stream format has not been finalized yet, making it experimental since 2011. The multimedia container format called NUT is no longer being actively developed, but still maintained.^[13]

In summer 2010, Fiona Glaser, Ronald Bultje, and David Conrad of the FFmpeg Team announced the ffvp8 decoder. Through testing, they determined that ffvp8 was faster than Google's own libvpx decoder.^[14][15] Starting with version 0.6, FFmpeg also supported WebM and VP8.^[16]

In October 2013, a native VP9^[17] and the OpenHEVC decoder, an open source High Efficiency Video Coding (HEVC) decoder, were added to FFmpeg.^[18] In 2016 the native AAC encoder was considered stable, removing support for the two external AAC encoders from VisualOn and FAAC. FFmpeg 3.0 (nicknamed "Einstein" ) retained build support for the Fraunhofer FDK AAC encoder.^[19]

Components

Command line tools

• ffmpeg is a command-line tool that converts audio or video formats. It can also capture and encode in real-time from various hardware and software sources such as a TV capture card.
• ffserver is an HTTP and RTSP multimedia streaming server for live and recorded broadcasts. It can also be used to time shift live broadcasts.
• ffplay is a simple media player utilizing SDL and the FFmpeg libraries.
• ffprobe is a command-line tool to display media information (text, CSV, XML, JSON), see also Mediainfo.

Libraries

• libswresample is a library containing audio resampling routines.
• libavresample is a library containing audio resampling routines from the Libav project, similar to libswresample from ffmpeg.
• libavcodec is a library containing all of the native FFmpeg audio/video encoders and decoders. Most codecs were developed from scratch to ensure best performance and high code reusability.
• libavformat (Lavf)^[6] is a library containing demuxers and muxers for audio/video container formats.
• libavutil is a helper library containing routines common to different parts of FFmpeg. This library includes hash functions (Adler-32, CRC, MD5, RIPEMD, SHA-1. SHA-2, MurmurHash3, HMAC MD-5, HMAC SHA-1 and HMAC SHA-2), ciphers (DES, RC4, AES, AES-CTR, TEA, XTEA, Blowfish, CAST-128, Twofish and Camellia), LZO decompressor and Base64 encoder/decoder.
• libpostproc is a library containing older h263 based video postprocessing routines.
• libswscale is a library containing video image scaling and colorspace/pixelformat conversion routines.
• libavfilter is the substitute for vhook which allows the video/audio to be modified or examined between the decoder and the encoder. Filters have been ported from many projects including MPlayer and avisynth

Supported hardware

CPUs

FFmpeg encompasses software implementations of video and audio compressing and decompressing algorithms. These can be compiled and run on diverse instruction sets.

Many wide-spread instruction sets are supported by FFmpeg, like x86 (IA-32 and x86-64), PPC (PowerPC), ARM, DEC Alpha, SPARC, and MIPS.^[20]

Special purpose hardware

Various application-specific integrated circuit related to video and audio compression and decompression do exist. Such ASIC can perform the computation for audio/video decompression or compression partly or fully to offload these from the host CPU. To make use of such ASIC, instead of an complete implementation of some algorithm, only the API is required. There are numerous ASICs and APIs available, of which several are supported by FFmpeg.^[21]

Firm	ASIC	purpose	supported by FFmpeg	details
AMD	UVD	decompression
	VCE	compression
Intel	Intel Quick Sync Video	both	✓
Nvidia	PureVideo / NVDEC	decompression	✓	via the VDPAU API as of FFmpeg v1.2 (deprecated) via CUVID API as of FFmpeg v3.1[22]
	NVENC	compression	✓	as of FFmpeg v2.6
Broadcom	Crystal HD	decompression

Supported codecs and formats

Image formats

FFmpeg supports many common and some uncommon image formats.

The PGMYUV image format is a homebrewn variant of the binary (P5) PGM Netpbm format. FFmpeg also supports 16-bit depths of the PGM and PPM formats, and the binary (P7) PAM format with or without alpha channel, depth 8 bit or 16 bit for pix_fmts monob, gray, gray16be, rgb24, rgb48be, ya8, rgba, rgb64be.

Codecs

In addition to FFV1 and Snow codecs, which were created and developed from within FFmpeg, the project also supports codecs from the following:

Group	Format type	Format name
ISO/IEC/ITU-T	Video	MPEG-1 Part 2, H.261 (Px64),[23] H.262/MPEG-2 Part 2, H.263,[23] MPEG-4 Part 2, H.264/MPEG-4 AVC, HEVC/H.265[18] (MPEG-H Part 2), Motion JPEG, IEC DV video and CD+G
	Audio	MP1, MP2, MP3, AAC, HE-AAC, MPEG-4 ALS, G.711 µ-law, G.711 A-law, G.721 (aka G.726 32k), G.722, G.722.2 (aka AMR-WB), G.723 (aka G.726 24k and 40k), G.723.1, G.726, G.729, G.729D, IEC DV audio and Direct Stream Transfer
	Subtitle	MPEG-4 Timed Text (aka 3GPP Timed Text)
	Image	JPEG, JPEG-LS, JPEG 2000, PNG, CCITT G3 and CCITT G4
EBU	Subtitle	Spruce subtitle (EBU STL)
EIA	Subtitle	EIA-608
CEA	Subtitle	CEA-708
SMPTE	Video	SMPTE 314M (aka DVCAM and DVCPRO), SMPTE 370M (aka DVCPRO HD), VC-1 (aka WMV3), VC-2 (aka Dirac Pro), VC-3 (aka AVID DNxHD), VC-5 (aka Cineform)
	Audio	SMPTE 302M
	Image	DPX
ATSC/ETSI/DVB	Audio	Full Rate (GSM 06.10), AC-3 (Dolby Digital) and Enhanced AC-3 (Dolby Digital Plus)
	Subtitle	DVB Subtitling (ETSI 300 743)
DVD Forum/Dolby	Audio	MLP / Dolby TrueHD
	Subtitle	DVD-Video subtitles
DTS, Inc	Audio	DTS Coherent Acoustics (aka DTS or DCA), DTS Extended Surround (aka DTS-ES), DTS 96/24, DTS-HD High Resolution Audio, DTS Express (aka DTS-HD LBR), DTS-HD Master Audio
Blu-ray Disc Association	Subtitle	PGS (Presentation Graphics Stream)
3GPP	Audio	AMR-NB, AMR-WB (aka G.722.2)
3GPP2	Audio	QCELP-8 (aka SmartRate or IS-96C), QCELP-13 (aka PureVoice or IS-733) and Enhanced Variable Rate Codec (EVRC. aka IS-127)
World Wide Web Consortium	Video	Animated GIF
	Subtitle	WebVTT
	Image	GIF
IETF	Audio	iLBC (via libilbc), Opus and Comfort noise
International Voice Association	Audio	DSS-SP
SAC	Video	AVS video
Microsoft	Video	Microsoft RLE, Microsoft Video 1, Cinepak, Indeo (v2, v3 and v5),[23] Microsoft MPEG-4 v1, v2 and v3, Windows Media Video (WMV1, WMV2, WMV3/VC-1), WMV Screen and Mimic codec
	Audio	Windows Media Audio (WMA1, WMA2, WMA Pro and WMA Lossless), XMA (XMA1 and XMA2), MS-GSM and MS-ADPCM
	Subtitle	SAMI
	Image	Windows Bitmap, WMV Image (WMV9 Image and WMV9 Image v2) and DirectDraw Surface
Interactive Multimedia Association	Audio	IMA ADPCM
Digital Video Interactive	Video	RTV 2.1 (Intel Indeo 2)
	Audio	DVI4 audio codec
RealNetworks	Video	RealVideo 1, 2, 3 and 4
	Audio	RealAudio v1 – v10
	Subtitle	RealText
Apple	Video	Cinepak (Apple Compact Video), ProRes, Sorenson 3 Codec, QuickTime Animation (Apple Animation), QuickTime Graphics (Apple Graphics), Apple Video
	Audio	QDesign Music Codec 2 and ALAC
Adobe Flash Player (SWF)	Video	Screen video, Screen video 2, Sorenson Spark and VP6
	Audio	Adobe SWF ADPCM and Nellymoser Asao
Aldus / Adobe	Image	TIFF
Xiph.Org	Video	Theora
	Audio	Speex (via libspeex), Vorbis, Opus and FLAC
	Subtitle	Ogg Writ
Sony	Audio	Adaptive Transform Acoustic Coding (ATRAC1, ATRAC3 and ATRAC3Plus)[23][24] and PSX ADPCM
NTT	Audio	TwinVQ
On2 / GIPS / Google	Video	Duck TrueMotion 1, Duck TrueMotion 2, Duck TrueMotion 2.0 Real Time, VP3, VP5,[23] VP6,[23] VP7, VP8, VP9[17] and animated WebP
	Audio	DK ADPCM Audio 3/4, On2 AVC and iLBC (via libilbc)
	Image	WebP
RAD Game Tools	Video	Smacker video and Bink video
DSP Group	Audio	Truespeech
RenderWare	Video	TXD[25]
Netpbm	Image	PBM, PGM and PPM
MIT/X Consortium	Image	XBM and xwd
Silicon Graphics	Video	Silicon Graphics RLE 8-bit video, Silicon Graphics MVC1/2
	Image	Silicon Graphics Image
Oracle/Sun Microsystems	Image	Sun Raster
IBM	Video	IBM UltiMotion
Avid Technology / Truevision	Video	Avid 1:1x, Avid Meridien, Avid DNxHD and DNxHR
	Image	Targa
Autodesk / Alias	Video	Autodesk Animator Studio Codec and FLIC
	Image	Alias PIX
Grass Valley / Canopus	Video	HQ, HQA, HQX and Lossless
Industrial Light & Magic / Lucasfilm	Image	OpenEXR
Mozilla Corporation	Video	APNG
Matrox	Video	Matrox Uncompressed SD (M101) / HD (M102)
AMD/ATI	Video	ATI VCR1/VCR2
Asus	Video	ASUS V1/V2 codec

The default MPEG-4 codec used by FFmpeg for encoding has the FourCC of FMP4.

Muxers

Output formats (container formats and other ways of creating output streams) in FFmpeg are called "muxers". FFmpeg supports, among others, the following:

• AIFF
• ASF
• AVI and also input from AviSynth
• BFI^[26]
• CAF
• FLV
• GIF
• GXF, General eXchange Format, SMPTE 360M
• HLS, HTTP Live Streaming
• IFF^[27]
• ISO base media file format (including QuickTime, 3GP and MP4)
• Matroska (including WebM)
• Maxis XA^[28]
• MPEG-DASH^[29]
• MPEG program stream
• MPEG transport stream (including AVCHD)
• MXF, Material eXchange Format, SMPTE 377M
• MSN Webcam stream^[30]
• NUT^[13]
• Ogg
• OMA^[31]
• RL2^[32]
• Segment, for creating segmented video streams
• Smooth Streaming
• TXD^[25]
• WTV

Pixel formats

FFmpeg supports many pixel formats.^[33] Some of these formats are only supported as input formats. The command ffmpeg -pix_fmts provides a list of supported pixel formats.

Type	Color	Packed		Planar			Palette
		Without alpha	With alpha	Without alpha	With alpha	Chroma-interleaved	With alpha
Monochrome	Binary (1-bit monochrome)	monoblack, monowhite	-	-	-	-	-
	Grayscale	8 / 10 / 12 / 16bpp	16 / 32bpp	-	-	-	-
RGB	RGB 1:2:1 (4-bit color)	4bpp	-	-	-	-	-
	RGB 3:3:2 (8-bit color)	8bpp	-	-	-	-	-
	RGB 5:5:5 (High color)	16bpp	-	-	-	-	-
	RGB 5:6:5 (High color)	16bpp	-	-	-	-	-
	RGB/BGR	24 / 48bpp	32[p 1] / 64bpp	-	-	-	8bit->32bpp
	GBR[p 2]	-	-	8 / 9 / 10 / 12 / 14 / 16bpc	8 / 10 / 12 / 16bpc	-	-
YUV	YVU 4:1:0	-	-	(9bpp (YVU9))[p 3]	-	-	-
	YUV 4:1:0	-	-	9bpp	-	-	-
	YUV 4:1:1	8bpc (UYYVYY)	-	8bpc	-	(8bpc (NV11))	-
	YVU 4:2:0	-	-	(8bpc (YV12))[p 3]	-	8 (NV21)	-
	YUV 4:2:0	-	-	8 (I420 aka YUV420P) / 9 / 10 / 12 / 14 / 16bpc	8 / 9 / 10 / 16bpc	8 (NV12) / 10 (P010) / 16bpc (P016)	-
	YVU 4:2:2	-	-	(8bpc (YV16))[p 3]	-	(8bpc (NV61))	-
	YUV 4:2:2	8bpc (YUYV[p 4] and UYVY)[p 5]	-	8 (I422 aka YUV422P) / 9 / 10 / 16bpc	8 / 9 / 10 / 16bpc	8 (NV16) / 10bpc (NV20 aka P210)[p 6]	-
	YUV 4:4:0	-	-	8 / 10 / 12bpc	-	-	-
	YVU 4:4:4	-	-	(8bpc (YV24))[p 3]	-	(8bpc (NV42))	-
	YUV 4:4:4	(10 (Y410) and 16bpc (Y416))	16bpc[p 7]	8 (I444 aka YUV444P) / 9 / 10 / 16bpc	8 / 9 / 10 / 16bpc	(8bpc (NV24))	-
XYZ	XYZ 4:4:4[p 8]	12bpc	-	-	-	-	-
Bayer	BGGR/RGGB/GBRG/GRBG	8 / 16bpp	-	-	-	-	-

1. RGBx (rgb0) and xBGR (0bgr) are also supported
2. used in YUV-centric codecs such like H.264
3. YVU9, YV12, YV16, and YV24 are supported as rawvideo codec in FFmpeg.
4. aka YUY2 in Windows
5. 10bpc (Y210) is not supported. 16bpc (Y216) is supported as targa_y216 codec in FFmpeg.
6. 16bpc (P216) is not supported
7. 8bpc (AYUV) is not supported
8. used in JPEG2000

FFmpeg does not support IMC1-IMC4, AI44, CYMK, RGB Float, RGBE, Log RGB and other formats. It also does not yet support ARGB 1:5:5:5, 2:10:10:10, or other BMP bitfield formats that are not commonly used.

Supported protocols

Open standards

• IETF RFCs
  • FTP
  • Gopher
  • HTTP
  • HTTPS
  • RTP
  • RTSP
  • SCTP
  • SDP
  • SRTP
  • TCP
  • TLS
  • UDP
  • UDP-Lite
• IETF I-Ds:
  • HLS^[34]
  • SFTP (via libssh)
• Microsoft OSP
  • CIFS/SMB (via libsmbclient)
  • MMS over TCP (MS-MMSP) and MMS over HTTP (MS-WMSP)
• Pro-MPEG Forum: Pro-MPEG CoP #3 r2

De facto standards

• RTSPS (RTSP over TLS)^[35][36]

Open-source

• Icecast protocol

Proprietary

• Adobe RTMP, RTMPT, RTMPE, RTMPTE and RTMPS (can be compiled with the native support or using rtmpdumps librtmp library)
• RealMedia RTSP/RDT

Supported filters

Audio

Resampling (aresample) Pass/Stop filters Low-pass filter (lowpass) High-pass filter (highpass) All-pass filter (allpass) Butterworth Band-pass filter (bandpass) Butterworth Band-stop filter (bandreject) Equalizer Peak Equalizer (equalizer) Butterworth/Chebyshev Type I/Type II Multiband Equalizer (anequalizer) Low Shelving filter (bass) High Shelving filter (treble) FIR equalizer (firequalizer) Biquad filter (biquad) Remove/Add DC offset (dcshift) Expression evaluation Time domain expression evaluation (aeval) Frequency domain expression evaluation (afftfilt) Dynamics Limiter (alimiter) Compressor (acompressor) Dynamic range expander (crystalizer) Side-chain Compressor (sidechaincompress) Compander (compand) Noise gate (agate) Side-chain Noise gate(sidechaingate) Distortion Bitcrusher (acrusher) Emphasis (aemphasis) Amplify/Normalizer Volume (volume) Dynamic Audio Normalizer (dynaudnorm) EBU R128 loudness normalizer (loudnorm) Modulation Sinusoidal Amplitude Modulation (tremolo) Sinusoidal Phase Modulation (vibrato) Phaser (aphaser) Chorus (chorus) Flanger (flanger) Pulsator (apulsator) Echo/Reverb Echo (aecho)

Routing/Panning Stereo widening (stereowiden) Increase channel differences (extrastereo) M/S to L/R (stereotools) Channel mapping (channelmap) Channel splitting (channelsplit) Channel panning (pan) Channel merging (amerge) Channel joining (join) for Headphones Stereo to Binaural (earwax, ported from SoX)[37] Bauer Stereo to Binaural (bs2b, via libbs2b) Multi-channel to Binaural (sofalizer, requires libnetcdf) Delay Delay (adelay) Delay by distance (compensationdelay) Fade Fader (afade) Crossfader (acrossfade) Audio time-scale/pitch modification Time stretching (atempo) Time-stretching and Pitch-shifting (rubberband, via librubberband) Editing Trim (atrim) Silence-padding (apad) Silence remover (silenceremove) Show frame/channel information Show frame information (ashowinfo) Show channel information (astats) Show silence ranges (silencedetect) Show audio volumes (volumedetect) ReplayGain scanner (replaygain) Modify frame/channel informations Set output format (aformat) Set number of sample (asetnsamples) Set sampling rate (asetrate) Mixer (amix) Synchronization (asyncts) HDCD data decoder (hdcd) Plugins LADSPA (ladspa) Do nothing (anull)

Legal aspects

FFmpeg contains more than 100 codecs,^[38] most of which use compression techniques of one kind or another. Many such compression techniques may be subject to legal claims relating to software patents.^[39] Such claims may be enforceable in countries like the United States which have implemented software patents, but are considered unenforceable or void in member countries of the European Union, for example.

FFmtech Foundation

In June 2011 an election was organized to establish the board of FFmtech foundation,^[40] a non-profit organization dedicated for managing donation funds. It was designed to offer reimbursement for expenses and work done to FFmpeg and Libav. However, according to FFmpeg developer Ronald Bultje the results have been doubtful.^[41]

Projects using FFmpeg

FFmpeg is used by software such as VLC media player, xine, HandBrake, Plex, Blender, YouTube,^[42] and MPC-HC;^[43] it handles video and audio playback in Google Chrome,^[43] and Linux version of Firefox.^[44] Graphical user interface front-ends for FFmpeg have been developed, including Avanti,^[45] and XMedia Recode. JavaCV, a Java wrapper for OpenCV, includes a supplementary Java wrapper for FFmpeg.^[46]

FFmpeg is used by ffdshow, LAV Filters, GStreamer FFmpeg plug-in, Perian and OpenMAX IL to expand the encoding and decoding capabilities of their respective multimedia platform.

Forks

Libav

On March 13, 2011, a group of FFmpeg developers decided to fork the project under the name "Libav".^[47][48][49] The event was related to a recent issue in project management, in which developers disagreed with the leadership of FFmpeg.^[50][51][52]

See also

• MEncoder, a similar project
• Open source codecs and containers

References

1. "Initial revision - git.videolan.org/ffmpeg.git/commit". git.videolan.org. 2000-12-20. Retrieved 2013-05-11.
2. "FFmpeg 3.2 "Hypatia"". FFmpeg Git. 2016-11-26. Retrieved 2016-11-26.
3. "Developer Documentation". ffmpeg.org. 2011-12-08. Retrieved 2012-01-04.
4. "Download". ffmpeg.org. FFmpeg. Retrieved 2012-01-04.
5. FFmpeg can be configured to make it proprietary and unredistributable software because NVIDIA Performance Primitives, an optional external library, is proprietary software and cannot be distributed under the terms of the GPL.
6. "FFmpeg: Lavf: I/O and Muxing/Demuxing Library". ffmpeg.org. Retrieved 21 October 2016.
7. "FFmpeg License and Legal Considerations". ffmpeg.org. Retrieved 2012-01-04.
8. Bellard, Fabrice (18 February 2006). "FFmpeg naming and logo". FFmpeg developer mailing list. FFmpeg website. Retrieved 24 December 2011.
9. Carlsen, Steve (1992-06-03). "TIFF 6.0 specification" (PS). Aldus. p. 98. Archived (PDF) from the original on 2004. Retrieved 2016-08-14. Zig-Zag Scan
10. Niedermayer, Michael. "[FFmpeg-devel] FFmpegs future and resigning as leader". Retrieved 2015-09-22.
11. "ffmpeg.org/download.html#releases". ffmpeg.org. Retrieved 2015-04-27.
12. "FFmpeg and a thousand fixes". googleblog.com. January 10, 2014. Retrieved 21 October 2016.
13. "NUT". Multimedia Wiki. 2012. Retrieved 2014-01-03.
14. Glaser, Fiona (2010-07-23), Diary Of An x264 Developer: Announcing the world’s fastest VP8 decoder, retrieved 2012-01-04
15. FFmpeg Announces High-Performance VP8 Decoder, Slashdot, 2010-07-24, retrieved 2012-01-04
16. "FFmpeg Goes WebM, Enabling VP8 for Boxee & Co". newteevee.com. 2010-06-17. Retrieved 2012-01-04. ...with VLC, Boxee, MythTV, Handbrake and MPlayer being some of the more popular projects utilizing FFmpeg...
17. "Native VP9 decoder is now in the Git master branch". Launchpad. 2013-10-03. Retrieved 2013-10-21.
18. "FFmpeg Now Features Native HEVC/H.265 Decoder Support". Softpedia. 2013-10-16. Retrieved 2013-10-16.
19. FFmpeg (2016-02-15). "February 15th, 2016, FFmpeg 3.0 "Einstein"". Retrieved 2016-04-02.
20. "FFmpeg Automated Testing Environment". Fate.multimedia.cx. Retrieved 2012-01-04.
21. "FFmpeg Hardware Acceleration". ffmpeg.org Wiki. Retrieved 2016-11-12.
22. "FFmpeg Changelog".
23. "Changelog". FFmpeg trunk SVN. FFmpeg. 17 April 2007. Retrieved 26 April 2007.
24. "ATRAC3plus decoder - git.videolan.org Git - ffmpeg.git/commit". git.videolan.org. 2013-12-28. Retrieved 2013-12-28.
25. "FFmpeg development mailing list". FFmpeg development. FFmpeg. 7 May 2007. Retrieved 24 December 2010.
26. vitor (13 April 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 14 April 2008.
27. vitor (30 March 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 30 March 2008.
28. benoit (14 April 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 14 April 2008.
29. Michael Niedermayer, Timothy Gu (2014-12-05). "RELEASE NOTES for FFmpeg 2.5 "Bohr"". VideoLAN. Retrieved 2014-12-05.
30. ramiro (18 March 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 18 March 2008.
31. banan (8 June 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 8 June 2008.
32. faust3 (21 March 2008). "FFmpeg development mailing list". FFmpeg development. FFmpeg website. Retrieved 21 March 2008.
33. "FFmpeg: libavutil/pixfmt.h File Reference - enum AVPixelFormat". FFmpeg Project. 2015-11-17. Retrieved 2015-11-18.
34. van Kesteren, Anne (2010-09-01). "Internet Drafts are not Open Standards". annevankesteren.nl. Self-published. Retrieved 2015-03-22.
35. Real Time Streaming Protocol 2.0 (RTSP) draft-ietf-mmusic-rfc2326bis-40 P.231
36. "rtsp: Support tls-encapsulated RTSP - git.videolan.org Git - ffmpeg.git/commit". videolan.org. Retrieved 21 October 2016.
37. How it works earwax.ca
38. "Codecs list". ffmpeg.org. Retrieved 2012-01-01.
39. "Legal information on FFmpeg's website". ffmpeg.org. Retrieved 2012-01-04.
40. "[Ffmtech-board-election] FFmtech board elections". June 8, 2011. Retrieved 14 August 2015.
41. "[Ffmpeg-devel-irc] ffmpeg-devel.log.20150814". August 14, 2015. Retrieved 15 August 2014.
42. "Google's YouTube Uses FFmpeg | Breaking Eggs And Making Omelettes". Multimedia.cx. 2011-02-08. Retrieved 2012-08-06.
43. "FFmpeg-based Projects". Ffmpeg.org. Retrieved 2012-01-04.
44. "Firefox Enables FFmpeg Support By Default". Phoronix. 2015-11-15. Retrieved 2015-11-18.
45. "Avanti: FFmpeg/Avisynth GUI". Retrieved 2011-08-17.
46. "JavaCV". GitHub. 2015.
47. Libav project site, retrieved 2012-01-04
48. Ronald S. Bultje (2011-03-14), Project renamed to Libav, retrieved 2012-01-04
49. A group of FFmpeg developers just forked as Libav, Phoronix, 2011-03-14, retrieved 2012-01-04
50. What happened to FFmpeg, 2011-03-30, retrieved 2012-05-19
51. FFMpeg turmoil, 2011-01-19, retrieved 2012-01-04
52. "The FFmpeg/Libav situation". blog.pkh.me. Retrieved 2015-09-22.

External links

• Official website
• FFmpeg at Open Hub