Leonardo via ffmpeg-user <ffmpeg-user@ffmpeg.org> writes:
> Hello,
>
> as an alternative, you can display your webcam at screen with mplayer
>
> $ mplayer tv:// -tv
> driver=v4l2:width=640:height=480:device=/dev/video0:fps=30:outfmt=yuy2
> -noborder -geometry 640x480+0+0
>
> and record your screen+audio with ffmpeg (here I'm using pulseaudio because of
> the "noise-reduction")
>
>
> $ ffmpeg -thread_queue_size 1024 -f pulse -sample_rate 44100 -i default
> -video_size 640x480 -probesize 10M -framerate 30 -thread_queue_size 512 -f
> x11grab -i :0.0 -c:a aac -b:a 128k -c:v libx264 -vf "format=yuv420p" -crf 0
> -preset ultrafast output.mp4
>
> You can use
>
> $ uvcdynctrl -f
>
> to identify which resolution/fps your webcam supports and edit commands above
> to your needs.
Thank you, Leonardo... but the problem remains: when I watch the resulting
video, it freezes for many seconds at start...
$ uvcdynctrl -f
Listing available frame formats for device video0:
Pixel format: YUYV (YUYV 4:2:2; MIME type: video/x-raw-yuv)
Frame size: 640x480
Frame rates: 30, 30
Frame size: 320x240
Frame rates: 30
Frame size: 160x120
Frame rates: 30
Frame size: 640x480
Frame rates: 30, 30
$ mplayer tv:// -tv
driver=v4l2:width=640:height=480:device=/dev/video0:fps=30:outfmt=yuy2
-noborder -geometry 640x480+0+0
MPlayer 1.3.0 (Debian), built with gcc-8 (C) 2000-2016 MPlayer Team
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing tv://.
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input
author: Martin Olschewski <olschew...@zpr.uni-koeln.de>
comment: first try, more to come ;-)
v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was
used instead.
Selected device: BZ IR: BZ IR
Capabilities: video capture streaming
supported norms:
inputs: 0 = Camera 1;
Current input: 0
Current format: YUYV
tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
v4l2: ioctl enum norm failed: Inappropriate ioctl for device
Error: Cannot set norm!
Selected input hasn't got a tuner!
v4l2: ioctl set mute failed: Invalid argument
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
Movie-Aspect is undefined - no prescaling applied.
VO: [vdpau] 640x480 => 640x480 Packed YUY2
Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
==========================================================================
Audio: no sound
Starting playback...
V: 0.0 154/154 ??% ??% ??,?% 0 0
$ ffmpeg -thread_queue_size 1024 -f pulse -sample_rate 44100 -i default
-video_size 640x480 -probesize 10M -framerate 30 -thread_queue_size 512 -f
x11grab -i :0.0 -c:a aac -b:a 128k -c:v libx264 -vf "format=yuv420p" -crf 0
-preset ultrafast output.mp4
ffmpeg version 4.1.4-1+b2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9 (Debian 9.2.1-1)
configuration: --prefix=/usr --extra-version=1+b2 --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
--arch=amd64 --enable-gpl --disable-stripping --enable-avresample
--disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libaom --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa
--enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse
--enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx
--enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394
--enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
--enable-libx264 --enable-shared
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, pulse, from 'default':
Duration: N/A, start: 1595442907.483712, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Input #1, x11grab, from ':0.0':
Duration: N/A, start: 1595442908.796004, bitrate: N/A
Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 640x480, 30 fps, 30
tbr, 1000k tbn, 1000k tbc
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x55b270984840] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX BMI1 SlowPshufb
[libx264 @ 0x55b270984840] profile High 4:4:4 Predictive, level 3.0, 4:2:0 8-bit
[libx264 @ 0x55b270984840] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2018 - 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 lookahead_threads=1 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, mp4, to 'output.mp4':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p(progressive), 640x480, q=-1--1, 30 fps, 15360 tbn, 30 tbc
Metadata:
encoder : Lavc58.35.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp,
128 kb/s
Metadata:
encoder : Lavc58.35.100 aac
frame= 419 fps= 44 q=0.0 size= 768kB time=00:00:13.74 bitrate=
457.7kbits/s dup=120 drop=118 speed=1.44x
thanks,
rodolfo
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