A screencast is a digital recording of computer screen output, also known as a video screen capture, often containing audio narration.This post will guide you to record screencast using FFMPEG.
1 Configure FFMPEG
cd ffmpeg
./configure --enable-x11grab --enable-gpl
make
2 Do the recording
ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1024x768 -i :0.0 -acodec ac3 -vcodec mpeg2video output.avi
More ffmpeg options pls see:man ffmpeg
3 Check audio/video Codecs which FFMPEG supports
djstava@Gateway:~/ffmpeg$ ffmpeg -codecs
FFmpeg version SVN-r25137, Copyright (c) 2000-2010 the FFmpeg developers
built on Sep 17 2010 10:56:59 with gcc 4.4.3
configuration: --enable-x11grab --enable-gpl
libavutil 50.27. 0 / 50.27. 0
libavcore 0. 9. 0 / 0. 9. 0
libavcodec 52.89. 0 / 52.89. 0
libavformat 52.78. 5 / 52.78. 5
libavdevice 52. 2. 2 / 52. 2. 2
libavfilter 1.39. 0 / 1.39. 0
libswscale 0.11. 0 / 0.11. 0
Codecs:
D..... = Decoding supported
.E.... = Encoding supported
..V... = Video codec
..A... = Audio codec
..S... = Subtitle codec
...S.. = Supports draw_horiz_band
....D. = Supports direct rendering method 1
.....T = Supports weird frame truncation
------
D V D 4xm 4X Movie
D V D 8bps QuickTime 8BPS video
D A 8svx_exp 8SVX exponential
D A 8svx_fib 8SVX fibonacci
D V D FRWU Forward Uncompressed
EV a64multi Multicolor charset for Commodore 64
EV a64multi5 Multicolor charset for Commodore 64, extended with 5th color (colram)
DEA aac Advanced Audio Coding
D V D aasc Autodesk RLE
DEA ac3 ATSC A/52A (AC-3)
D A adpcm_4xm ADPCM 4X Movie
DEA adpcm_adx SEGA CRI ADX ADPCM
D A adpcm_ct ADPCM Creative Technology
D A adpcm_ea ADPCM Electronic Arts
D A adpcm_ea_maxis_xa ADPCM Electronic Arts Maxis CDROM XA
D A adpcm_ea_r1 ADPCM Electronic Arts R1
D A adpcm_ea_r2 ADPCM Electronic Arts R2
D A adpcm_ea_r3 ADPCM Electronic Arts R3
D A adpcm_ea_xas ADPCM Electronic Arts XAS
D A adpcm_ima_amv ADPCM IMA AMV
D A adpcm_ima_dk3 ADPCM IMA Duck DK3
D A adpcm_ima_dk4 ADPCM IMA Duck DK4
D A adpcm_ima_ea_eacs ADPCM IMA Electronic Arts EACS
D A adpcm_ima_ea_sead ADPCM IMA Electronic Arts SEAD
D A adpcm_ima_iss ADPCM IMA Funcom ISS
DEA adpcm_ima_qt ADPCM IMA QuickTime
D A adpcm_ima_smjpeg ADPCM IMA Loki SDL MJPEG
DEA adpcm_ima_wav ADPCM IMA WAV
D A adpcm_ima_ws ADPCM IMA Westwood
DEA adpcm_ms ADPCM Microsoft
D A adpcm_sbpro_2 ADPCM Sound Blaster Pro 2-bit
D A adpcm_sbpro_3 ADPCM Sound Blaster Pro 2.6-bit
D A adpcm_sbpro_4 ADPCM Sound Blaster Pro 4-bit
DEA adpcm_swf ADPCM Shockwave Flash
D A adpcm_thp ADPCM Nintendo Gamecube THP
D A adpcm_xa ADPCM CDROM XA
DEA adpcm_yamaha ADPCM Yamaha
DEA alac ALAC (Apple Lossless Audio Codec)
D A als MPEG-4 Audio Lossless Coding (ALS)
D A amrnb Adaptive Multi-Rate NarrowBand
D V D amv AMV Video
D V D anm Deluxe Paint Animation
D V D ansi ASCII/ANSI art
D A ape Monkey's Audio
DEV D asv1 ASUS V1
DEV D asv2 ASUS V2
D A atrac1 Atrac 1 (Adaptive TRansform Acoustic Coding)
D A atrac3 Atrac 3 (Adaptive TRansform Acoustic Coding 3)
D V D aura Auravision AURA
D V D aura2 Auravision Aura 2
D V D avs AVS (Audio Video Standard) video
D V D bethsoftvid Bethesda VID video
D V D bfi Brute Force & Ignorance
D A binkaudio_dct Bink Audio (DCT)
D A binkaudio_rdft Bink Audio (RDFT)
D V binkvideo Bink video
DEV D bmp BMP image
D V D c93 Interplay C93
D V D camstudio CamStudio
D V D camtasia TechSmith Screen Capture Codec
D V D cavs Chinese AVS video (AVS1-P2, JiZhun profile)
D V D cdgraphics CD Graphics video
D V D cinepak Cinepak
D V D cljr Cirrus Logic AccuPak
D A cook COOK
D V D cyuv Creative YUV (CYUV)
D A dca DCA (DTS Coherent Acoustics)
DEV D dnxhd VC3/DNxHD
D V dpx DPX image
D A dsicinaudio Delphine Software International CIN audio
D V D dsicinvideo Delphine Software International CIN video
DES dvbsub DVB subtitles
DES dvdsub DVD subtitles
DEV D dvvideo DV (Digital Video)
D V D dxa Feeble Files/ScummVM DXA
D A eac3 ATSC A/52B (AC-3, E-AC-3)
D V D eacmv Electronic Arts CMV video
D V D eamad Electronic Arts Madcow Video
D V D eatgq Electronic Arts TGQ video
D V eatgv Electronic Arts TGV video
D V D eatqi Electronic Arts TQI Video
D V D escape124 Escape 124
DEV D ffv1 FFmpeg video codec #1
DEVSD ffvhuff Huffyuv FFmpeg variant
DEA flac FLAC (Free Lossless Audio Codec)
DEV D flashsv Flash Screen Video
D V D flic Autodesk Animator Flic video
DEVSD flv Flash Video (FLV) / Sorenson Spark / Sorenson H.263
D V D fraps Fraps
D A g722 G.722 ADPCM
DEA g726 G.726 ADPCM
DEV D gif GIF (Graphics Interchange Format)
D A gsm GSM
D A gsm_ms GSM Microsoft variant
DEV D h261 H.261
DEVSDT h263 H.263 / H.263-1996
D VSD h263i Intel H.263
EV h263p H.263+ / H.263-1998 / H.263 version 2
D V D h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
DEVSD huffyuv Huffyuv / HuffYUV
D V D idcinvideo id Quake II CIN video
D V D iff_byterun1 IFF ByteRun1
D V D iff_ilbm IFF ILBM
D A imc IMC (Intel Music Coder)
D V D indeo2 Intel Indeo 2
D V D indeo3 Intel Indeo 3
D V indeo5 Intel Indeo Video Interactive 5
D A interplay_dpcm DPCM Interplay
D V D interplayvideo Interplay MVE video
DEV D jpegls JPEG-LS
D V kgv1 Kega Game Video
D V D kmvc Karl Morton's video codec
EV ljpeg Lossless JPEG
D V D loco LOCO
D A mace3 MACE (Macintosh Audio Compression/Expansion) 3:1
D A mace6 MACE (Macintosh Audio Compression/Expansion) 6:1
D V D mdec Sony PlayStation MDEC (Motion DECoder)
D V D mimic Mimic
DEV D mjpeg MJPEG (Motion JPEG)
D V D mjpegb Apple MJPEG-B
D A mlp MLP (Meridian Lossless Packing)
D V D mmvideo American Laser Games MM Video
D V D motionpixels Motion Pixels video
D A mp1 MP1 (MPEG audio layer 1)
D A mp1float MP1 (MPEG audio layer 1)
DEA mp2 MP2 (MPEG audio layer 2)
D A mp2float MP2 (MPEG audio layer 2)
D A mp3 MP3 (MPEG audio layer 3)
D A mp3adu ADU (Application Data Unit) MP3 (MPEG audio layer 3)
D A mp3adufloat ADU (Application Data Unit) MP3 (MPEG audio layer 3)
D A mp3float MP3 (MPEG audio layer 3)
D A mp3on4 MP3onMP4
D A mp3on4float MP3onMP4
D A mpc7 Musepack SV7
D A mpc8 Musepack SV8
DEVSDT mpeg1video MPEG-1 video
DEVSDT mpeg2video MPEG-2 video
DEVSDT mpeg4 MPEG-4 part 2
D VSDT mpegvideo MPEG-1 video
DEVSD msmpeg4 MPEG-4 part 2 Microsoft variant version 3
DEVSD msmpeg4v1 MPEG-4 part 2 Microsoft variant version 1
DEVSD msmpeg4v2 MPEG-4 part 2 Microsoft variant version 2
D V D msrle Microsoft RLE
D V D msvideo1 Microsoft Video 1
D V D mszh LCL (LossLess Codec Library) MSZH
DEA nellymoser Nellymoser Asao
D V D nuv NuppelVideo/RTJPEG
DEV D pam PAM (Portable AnyMap) image
DEV D pbm PBM (Portable BitMap) image
DEA pcm_alaw PCM A-law
D A pcm_bluray PCM signed 16|20|24-bit big-endian for Blu-ray media
D A pcm_dvd PCM signed 20|24-bit big-endian
DEA pcm_f32be PCM 32-bit floating point big-endian
DEA pcm_f32le PCM 32-bit floating point little-endian
DEA pcm_f64be PCM 64-bit floating point big-endian
DEA pcm_f64le PCM 64-bit floating point little-endian
DEA pcm_mulaw PCM mu-law
DEA pcm_s16be PCM signed 16-bit big-endian
DEA pcm_s16le PCM signed 16-bit little-endian
D A pcm_s16le_planar PCM 16-bit little-endian planar
DEA pcm_s24be PCM signed 24-bit big-endian
DEA pcm_s24daud PCM D-Cinema audio signed 24-bit
DEA pcm_s24le PCM signed 24-bit little-endian
DEA pcm_s32be PCM signed 32-bit big-endian
DEA pcm_s32le PCM signed 32-bit little-endian
DEA pcm_s8 PCM signed 8-bit
DEA pcm_u16be PCM unsigned 16-bit big-endian
DEA pcm_u16le PCM unsigned 16-bit little-endian
DEA pcm_u24be PCM unsigned 24-bit big-endian
DEA pcm_u24le PCM unsigned 24-bit little-endian
DEA pcm_u32be PCM unsigned 32-bit big-endian
DEA pcm_u32le PCM unsigned 32-bit little-endian
DEA pcm_u8 PCM unsigned 8-bit
DEA pcm_zork PCM Zork
DEV D pcx PC Paintbrush PCX image
DEV D pgm PGM (Portable GrayMap) image
DEV D pgmyuv PGMYUV (Portable GrayMap YUV) image
D S pgssub HDMV Presentation Graphic Stream subtitles
D V D pictor Pictor/PC Paint
DEV D png PNG image
DEV D ppm PPM (Portable PixelMap) image
D V D ptx V.Flash PTX image
D A qcelp QCELP / PureVoice
D A qdm2 QDesign Music Codec 2
D V D qdraw Apple QuickDraw
D V D qpeg Q-team QPEG
DEV D qtrle QuickTime Animation (RLE) video
D V D r10k AJA Kona 10-bit RGB Codec
D V D r210 Uncompressed RGB 10-bit
DEV rawvideo raw video
DEA real_144 RealAudio 1.0 (14.4K) encoder
D A real_288 RealAudio 2.0 (28.8K)
D V D rl2 RL2 video
DEA roq_dpcm id RoQ DPCM
DEV D roqvideo id RoQ video
D V D rpza QuickTime video (RPZA)
DEV D rv10 RealVideo 1.0
DEV D rv20 RealVideo 2.0
D V D rv30 RealVideo 3.0
D V D rv40 RealVideo 4.0
DEV sgi SGI image
D A shorten Shorten
D A sipr RealAudio SIPR / ACELP.NET
D A smackaud Smacker audio
D V D smackvid Smacker video
D V D smc QuickTime Graphics (SMC)
DEV D snow Snow
D A sol_dpcm DPCM Sol
DEA sonic Sonic
EA sonicls Sonic lossless
D V D sp5x Sunplus JPEG (SP5X)
D V D sunrast Sun Rasterfile image
DEV D svq1 Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1
D VSD svq3 Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3
DEV D targa Truevision Targa image
D VSD theora Theora
D V D thp Nintendo Gamecube THP video
D V D tiertexseqvideo Tiertex Limited SEQ video
DEV D tiff TIFF image
D V D tmv 8088flex TMV
D A truehd TrueHD
D V D truemotion1 Duck TrueMotion 1.0
D V D truemotion2 Duck TrueMotion 2.0
D A truespeech DSP Group TrueSpeech
D A tta True Audio (TTA)
D A twinvq VQF TwinVQ
D V D txd Renderware TXD (TeXture Dictionary) image
D V D ultimotion IBM UltiMotion
DEV D v210 Uncompressed 4:2:2 10-bit
D V D v210x Uncompressed 4:2:2 10-bit
D V vb Beam Software VB
D V D vc1 SMPTE VC-1
D V D vcr1 ATI VCR1
D A vmdaudio Sierra VMD audio
D V D vmdvideo Sierra VMD video
D V D vmnc VMware Screen Codec / VMware Video
DEA vorbis Vorbis
D VSD vp3 On2 VP3
D V D vp5 On2 VP5
D V D vp6 On2 VP6
D V D vp6a On2 VP6 (Flash version, with alpha channel)
D V D vp6f On2 VP6 (Flash version)
D V D vp8 On2 VP8
D V D vqavideo Westwood Studios VQA (Vector Quantized Animation) video
D A wavpack WavPack
D A wmapro Windows Media Audio 9 Professional
DEA wmav1 Windows Media Audio 1
DEA wmav2 Windows Media Audio 2
D A wmavoice Windows Media Audio Voice
DEVSD wmv1 Windows Media Video 7
DEVSD wmv2 Windows Media Video 8
D V D wmv3 Windows Media Video 9
D V D wnv1 Winnov WNV1
D A ws_snd1 Westwood Audio (SND1)
D A xan_dpcm DPCM Xan
D V D xan_wc3 Wing Commander III / Xan
D V D xl Miro VideoXL
DES xsub DivX subtitles (XSUB)
D V yop Psygnosis YOP Video
DEV D zlib LCL (LossLess Codec Library) ZLIB
DEV D zmbv Zip Motion Blocks Video
Note, the names of encoders and decoders do not always match, so there are
several cases where the above table shows encoder only or decoder only entries
even though both encoding and decoding are supported. For example, the h263
decoder corresponds to the h263 and h263p encoders, for file formats it is even
worse.
djstava
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