1. vid="screencast"; \
  2. crf="23"; \
  3. preset="slower"; \
  4. pushd /tmp/ && \
  5. ffmpeg -y -f x11grab -show_region 1 -s 1920x1080 -i :0.0+0,0 -an -c:v libx264 -preset ultrafast -qp 0 -threads 0 /dev/shm/${vid}.mp4 && \
  6. ffmpeg -y -ss 00:00:02 -i /dev/shm/${vid}.mp4 -an -c:v libx264 -preset ${preset} -crf ${crf} -s 1920x1080 -s hd720 -sws_flags lanczos -threads 0 ~/${vid}_${crf}crf_${preset}_`date +%F_%H%M%S`.mp4 && \
  7. popd && ls -l /dev/shm/${vid}*.mp4 && ls -l ~/${vid}*.mp4 && rm --interactive /dev/shm/${vid}*.mp4
  10. Sample run:
  11. $ vid="screencast"; \
  12. > crf="23"; \
  13. > preset="slower"; \
  14. > pushd /tmp/ && \
  15. > ffmpeg -y -f x11grab -show_region 1 -s 1920x1080 -i :0.0+0,0 -an -c:v libx264 -preset ultrafast -qp 0 -threads 0 /dev/shm/${vid}.mp4 && \
  16. > ffmpeg -y -ss 00:00:02 -i /dev/shm/${vid}.mp4 -an -c:v libx264 -preset ${preset} -crf ${crf} -s 1920x1080 -s hd720 -sws_flags lanczos -threads 0 ~/${vid}_${crf}crf_${preset}_`date +%F_%H%M%S`.mp4 && \
  17. > popd && ls -l /dev/shm/${vid}*.mp4 && ls -l ~/${vid}*.mp4 && rm --interactive /dev/shm/${vid}*.mp4
  18. /tmp ~
  19. ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
  20. built on Mar 8 2014 19:28:45 with gcc 4.8.2 (Gentoo 4.8.2 p1.3r1, pie-0.5.8r1)
  21. configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 -pipe' --extra-cflags='-march=native -O2 -pipe' --extra-cxxflags='-march=native -O2 -pipe' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --enable-nonfree --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-network --disable-openssl --enable-ffplay --disable-vaapi --enable-vdpau --enable-zlib --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --enable-libfdk-aac --disable-libaacplus --disable-libfaac --enable-libtheora --disable-libtwolame --enable-libx264 --enable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-li libavutil 52. 18.100 / 52. 18.100
  22. libavcodec 54. 92.100 / 54. 92.100
  23. libavformat 54. 63.104 / 54. 63.104
  24. libavdevice 54. 3.103 / 54. 3.103
  25. libavfilter 3. 42.103 / 3. 42.103
  26. libswscale 2. 2.100 / 2. 2.100
  27. libswresample 0. 17.102 / 0. 17.102
  28. libpostproc 52. 2.100 / 52. 2.100
  29. [x11grab @ 0xcbd050] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 width: 1920 height: 1080
  30. [x11grab @ 0xcbd050] shared memory extension found
  31. [x11grab @ 0xcbd050] Estimating duration from bitrate, this may be inaccurate
  32. Input #0, x11grab, from ':0.0+0,0':
  33. Duration: N/A, start: 1395235630.495227, bitrate: 1988667 kb/s
  34. Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1988667 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
  35. [libx264 @ 0xcdb490] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  36. [libx264 @ 0xcdb490] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
  37. [libx264 @ 0xcdb490] 64 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=12 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
  38. Output #0, mp4, to '/dev/shm/screencast.mp4':
  39. Metadata:
  40. encoder : Lavf54.63.104
  41. Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv444p, 1920x1080, q=-1--1, 30k tbn, 29.97 tbc
  42. Stream mapping:
  43. Stream #0:0 -> #0:0 (rawvideo -> libx264)
  44. Press [q] to stop, [?] for help