On Sun, Aug 11, 2013 at 6:18 AM, Diego Simak <[email protected]> wrote:
> 2013/8/8 J. Liles <[email protected]> > > > > > > As some of you may recall, every time I've posted a demo video to LAD, > I've had to include a disclaimer excusing the poor quality due to a lack of > functional screencasting tools. > > > > Well, it took a couple of weeks of hair pulling and many, many hours of > testing, but I finally arrived at a solution. > > > > Anyone who wants to create a screencast and record audio via JACK *in > perfect sync* must do the following: > > > > Get ffmpeg. Apply this patch to it: > > > > > https://github.com/original-male/FFmpeg/commit/d02509d04d396a98646ca81e9ba327a501486130.patch > > > > Build it with vorbis and h264 support. > > > > Then, start your favorite desktop environment. I use Xephyr for this. > > > > Have jack running (at -r 48000) > > > > Then run the following command: > > > > ffmpeg -fflags +genpts+igndts -f x11grab -vsync 0 -r 30 -s 1920x1080 -i > :${DISPLAY}.+0,0 -vcodec h264 -f jack -ac 2 -r:a 48000 -i screencast > -acodec pcm_s16le -r:v 30 -vsync 2 -async 1 -map 0:0,1,0 -map 1:0 -preset > ultrafast -qp 0 "$FILE" > > > > Where DISPLAY is the number of your X11 display and FILE is the filename > for the screencast. I use a .mkv extension for the matroska container. > > > > Remember to connect the streams you want recorded to the 'screencast' > JACK inputs! > > > > With this setup I'm able to record a full 30 FPS @ 1080P with audio in > perfect sync. Please share your results too. With some more evidence I > might have a good case to get ffmpeg to accept my patch. > > > > Enjoy! > > > > > > > > > > > > > > > > _______________________________________________ > > Linux-audio-dev mailing list > > [email protected] > > http://lists.linuxaudio.org/listinfo/linux-audio-dev > > > > My result: > > - I had to change screen size to 1366x768 according to my laptop display > - Audio and video are not in sync, I can see the following message > after executing the ffmpeg command: > > [swscaler @ 0x1ac5080] Warning: data is not aligned! This can lead to > a speedloss > > > This is the full log. > Thank you very much! > > diego@ruidosa:~$ ffmpeg -fflags +genpts+igndts -f x11grab -vsync 0 -r > 30 -s 1366x768 -i :0.0+0,0 -vcodec h264 -f jack -ac 2 -r:a 48000 -i > screencast -acodec pcm_s16le -r:v 30 -vsync 2 -async 1 -map 0:0,1,0 > -map 1:0 -preset ultrafast -qp 0 aaa.mkv > ffmpeg version N-55422-gb37ff48 Copyright (c) 2000-2013 the FFmpeg > developers > built on Aug 10 2013 10:54:00 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) > configuration: --enable-libx264 --enable-x11grab --enable-gpl > --enable-libvorbis --disable-yasm > libavutil 52. 41.100 / 52. 41.100 > libavcodec 55. 24.100 / 55. 24.100 > libavformat 55. 13.102 / 55. 13.102 > libavdevice 55. 3.100 / 55. 3.100 > libavfilter 3. 82.100 / 3. 82.100 > libswscale 2. 4.100 / 2. 4.100 > libswresample 0. 17.103 / 0. 17.103 > libpostproc 52. 3.100 / 52. 3.100 > [x11grab @ 0x1ae3700] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 > width: 1366 height: 768 > [x11grab @ 0x1ae3700] shared memory extension found > Input #0, x11grab, from ':0.0+0,0': > Duration: N/A, start: 1376226919.464630, bitrate: 1007124 kb/s > Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, > 1007124 kb/s, 30 tbr, 1000k tbn, 30 tbc > jack_port_get_latency_range called with an incorrect port 0 > [jack @ 0x1afbce0] JACK client registered and activated (rate=48000Hz, > buffer_size=1024 frames) > Guessed Channel Layout for Input Stream #1.0 : stereo > Input #1, jack, from 'screencast': > Duration: N/A, start: 1376226919.619355, bitrate: 3072 kb/s > Stream #1:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s > [swscaler @ 0x1ac5080] deprecated pixel format used, make sure you did > set range correctly > No pixel format specified, yuv444p for H.264 encoding chosen. > Use -pix_fmt yuv420p for compatibility with outdated media players. > -async is forwarded to lavfi similarly to -af > aresample=async=1:min_hard_comp=0.100000:first_pts=0. > [libx264 @ 0x2b6e520] using cpu capabilities: MMX2 SSE2Fast SSSE3 > FastShuffle SSE4.1 Cache64 > [libx264 @ 0x2b6e520] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit > [libx264 @ 0x2b6e520] 64 - core 120 r2151 a3f4407 - 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=3 > 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 > Output #0, matroska, to 'aaa.mkv': > Metadata: > encoder : Lavf55.13.102 > Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, > 1366x768, q=-1--1, 1k tbn, 30 tbc > Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, > stereo, s16, 1536 kb/s > Stream mapping: > Stream #0:0 -> #0:0 (rawvideo -> libx264) > Stream #1:0 -> #0:1 (pcm_f32le -> pcm_s16le) > Press [q] to stop, [?] for help > [swscaler @ 0x1ac5080] Warning: data is not aligned! This can lead to > a speedloss > frame= 122 fps= 23 q=-1.0 Lsize= 2774kB time=00:00:04.06 > bitrate=5588.3kbits/s > video:2040kB audio:732kB subtitle:0 global headers:0kB muxing overhead > 0.097703% > [libx264 @ 0x2b6e520] frame I:1 Avg QP: 0.00 size:596863 > [libx264 @ 0x2b6e520] frame P:121 Avg QP: 0.00 size: 12324 > [libx264 @ 0x2b6e520] mb I I16..4: 100.0% 0.0% 0.0% > [libx264 @ 0x2b6e520] mb P I16..4: 7.6% 0.0% 0.0% P16..4: 0.3% > 0.0% 0.0% 0.0% 0.0% skip:92.1% > [libx264 @ 0x2b6e520] coded y,u,v intra: 11.9% 37.1% 37.5% inter: 0.2% > 0.2% 0.2% > [libx264 @ 0x2b6e520] i16 v,h,dc,p: 91% 8% 0% 0% > [libx264 @ 0x2b6e520] kb/s:4107.72 > Received signal 2: terminating. > diego@ruidosa:~$ > diego@ruidosa:~$ > diego@ruidosa:~$ > Interesting. If you use Xephyr you can record a virtual desktop larger than your actual display (and therefore 1920x1080), does that avoid the error (and give you better results)?
_______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
