[LAD] Screencasting with JACK [SOLVED!]
F. Medeiros
excalibas at gmail.com
Thu Sep 26 15:16:08 UTC 2013
Hello,
I have the same problem, audio and video are not in sync and the data
is not aligned Warning.
This also happens when using Xephyr.
This is what I get from ffmpeg:
x at space:~/Documents/ffmpeg$ ./ffmpeg -fflags +genpts+igndts -f x11grab
-vsync 0 -r 30 -s 1920x1080 -i :1.0+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 test.mkv
ffmpeg version N-56669-g1906e00 Copyright (c) 2000-2013 the FFmpeg
developers
built on Sep 26 2013 11:48:30 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --enable-libvorbis --enable-gpl --enable-libx264
--enable-x11grab
libavutil 52. 46.100 / 52. 46.100
libavcodec 55. 33.100 / 55. 33.100
libavformat 55. 18.102 / 55. 18.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 87.100 / 3. 87.100
libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
[x11grab @ 0x917dfc0] device: :1.0+0,0 -> display: :1.0 x: 0 y: 0 width:
1920 height: 1080
[x11grab @ 0x917dfc0] shared memory extension found
Input #0, x11grab, from ':1.0+0,0':
Duration: N/A, start: 1380208288.085940, bitrate: 1990656 kb/s
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080,
1990656 kb/s, 30 tbr, 1000k tbn, 30 tbc
jack_port_get_latency_range called with an incorrect port 0
[jack @ 0x918e260] JACK client registered and activated (rate=48000Hz,
buffer_size=256 frames)
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, jack, from 'screencast':
Duration: N/A, start: 1380144319.409428, bitrate: 3072 kb/s
Stream #1:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s
[swscaler @ 0x9171fc0] 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Use -pix_fmt yuv420p for compatibility with outdated media players.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 @ 0x95e97c0] using cpu capabilities: MMX2 SSE2Fast SSSE3
FastShuffle SSE4.2
[libx264 @ 0x95e97c0] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
[libx264 @ 0x95e97c0] 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=6
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 'test.mkv':
Metadata:
encoder : Lavf55.18.102
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p,
1920x1080, 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 @ 0x9171fc0] Warning: data is not aligned! This can lead to a
speedloss
frame= 76 fps= 30 q=-1.0 Lsize= 1218kB time=00:00:02.53
bitrate=3939.6kbits/s
video:745kB audio:469kB subtitle:0 global headers:0kB muxing overhead
0.358030%
[libx264 @ 0x95e97c0] frame I:1 Avg QP: 0.00 size: 7840
[libx264 @ 0x95e97c0] frame P:75 Avg QP: 0.00 size: 10057
[libx264 @ 0x95e97c0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x95e97c0] mb P I16..4: 98.5% 0.0% 0.0% P16..4: 0.0%
0.0% 0.0% 0.0% 0.0% skip: 1.5%
[libx264 @ 0x95e97c0] coded y,u,v intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0%
0.0%
[libx264 @ 0x95e97c0] i16 v,h,dc,p: 100% 0% 0% 0%
[libx264 @ 0x95e97c0] kb/s:2406.68
x at space:~/Documents/ffmpeg$
On 08/12/2013 03:18 AM, J. Liles wrote:
>
>
>
> On Sun, Aug 11, 2013 at 6:18 AM, Diego Simak <diego.simak at gmail.com
> <mailto:diego.simak at gmail.com>> wrote:
>
> 2013/8/8 J. Liles <malnourite at gmail.com <mailto:malnourite at gmail.com>>
> >
> >
> > 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
> > Linux-audio-dev at lists.linuxaudio.org
> <mailto:Linux-audio-dev at lists.linuxaudio.org>
> > 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 at 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 at ruidosa:~$
> diego at ruidosa:~$
> diego at 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
> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-dev
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