[FFmpeg-user] How to grab the desktop in the webm format

Sat May 28 22:59:15 CEST 2016

Hi, Carl !

I will paste the console output for you:

ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 5.3.0 (GCC)
 configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --en
able-avisynth --enable-avresample --enable-fontconfig --enable-gnutls
--enable-gpl --ena
ble-ladspa --enable-libass --enable-libbluray --enable-libdcadec
--enable-libfreetype --
enable-libfribidi --enable-libgsm --enable-libiec61883
--enable-libmodplug --enable-libm
p3lame --enable-libopencore_amrnb --enable-libopencore_amrwb
--enable-libopenjpeg --enab
le-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr
--enable-libspeex
--enable-libssh --enable-libtheora --enable-libv4l2
--enable-libvidstab --enable-libvor
bis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxvid
--enable-netcdf --enable-shared --enable-version3 --enable-x11grab
 libavutil      55. 17.103 / 55. 17.103
 libavcodec     57. 24.102 / 57. 24.102
 libavformat    57. 25.100 / 57. 25.100
 libavdevice    57.  0.101 / 57.  0.101
 libavfilter     6. 31.100 /  6. 31.100
 libavresample   3.  0.  0 /  3.  0.  0
 libswscale      4.  0.100 /  4.  0.100
 libswresample   2.  0.101 /  2.  0.101
 libpostproc    54.  0.100 / 54.  0.100
Input #0, x11grab, from ':0.0':
 Duration: N/A, start: 1464468959.871402, bitrate: N/A
   Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1600x900,
30 fps, 30 tbr, 10
00k tbn, 30 tbc
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:0':
 Duration: N/A, start: 1464468959.974821, bitrate: 1536 kb/s
   Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x55f90b8d6060] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
[libx264 @ 0x55f90b8d6060] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
[libx264 @ 0x55f90b8d6060] 264 - core 148 r2643 5c65704 - H.264/MPEG-4
AVC codec - Copyl
eft 2003-2015 - 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
lookahead_threads=1 slic
ed_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
[libopus @ 0x55f90b8d6fc0] No bit rate set. Defaulting to 96000 bps.
Output #0, webm, to 'capture20.webm':
 Metadata:
   encoder         : Lavf57.25.100
   Stream #0:0: Video: h264 (libx264), yuv444p, 1600x900, q=-1--1, 30
fps, 1k tbn, 30 t
bc
   Metadata:
     encoder         : Lavc57.24.102 libx264
   Side data:
     unknown side data type 10 (24 bytes)
   Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, s16, 96 kb/s
   Metadata:
     encoder         : Lavc57.24.102 libopus
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
 Stream #1:0 -> #0:1 (pcm_s16le (native) -> opus (libopus))
Press [q] to stop, [?] for help
[x11grab @ 0x55f90b8bcb80] Thread message queue blocking; consider
raising the thread_qu
eue_size option (current value: 8)
[alsa @ 0x55f90b8c4280] Thread message queue blocking; consider
raising the thread_queue
_size option (current value: 8)
[webm @ 0x55f90b8d4b40] Only VP8 or VP9 video and Vorbis or Opus audio
and WebVTT subtit
les are supported for WebM.
av_interleaved_write_frame(): Invalid argument
[webm @ 0x55f90b8d4b40] Only VP8 or VP9 video and Vorbis or Opus audio
and WebVTT subtit
les are supported for WebM.
Error writing trailer of capture20.webm: Invalid argumentframe=    5
fps=0.0 q=-1.0 Lsiz
e=       1kB time=00:00:00.46 bitrate=  14.2kbits/s dup=0 drop=3 speed=1.06x
video:871kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead:
unknown
[libx264 @ 0x55f90b8d6060] frame I:1     Avg QP: 0.00  size:315281
[libx264 @ 0x55f90b8d6060] frame P:4     Avg QP: 0.00  size:144086
[libx264 @ 0x55f90b8d6060] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x55f90b8d6060] mb P  I16..4: 60.5%  0.0%  0.0%  P16..4:
0.4%  0.0%  0.0%  0
.0%  0.0%    skip:39.1%
[libx264 @ 0x55f90b8d6060] coded y,u,v intra: 16.3% 15.4% 14.9% inter:
0.5% 0.5% 0.5%
[libx264 @ 0x55f90b8d6060] i16 v,h,dc,p: 84% 16%  0%  0%
[libx264 @ 0x55f90b8d6060] kb/s:15284.96
Conversion failed!

On Sat, May 28, 2016 at 5:51 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Alexandre Almeida <lugarparaler <at> selodigital.net> writes:
>
>> But I really can't understand how to save the video in the webm
>> format. If I change the "capture.mkv" for "capture.webm", I get an
>> error message in the terminal.
>
> Command line and complete, uncut console output missing.
>
> Carl Eugen
>
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