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  • How to fix laggy ffmpeg screen and audio capture ?

    26 juillet 2022, par Wh0r00t

    I am using ffmpeg to capture the screen along with audio.

    


    The ffmpeg command that i tried is

    


    ffmpeg -y \
    -f x11grab \
    -framerate 60 \
    -s 1366x768 \
    -i :0.0 \
    -f alsa -i default -ac 2 \
    -r 30 \
    -c:v h264 -crf 0 -preset ultrafast -c:a vorbis -strict experimental  \
    "$HOME/Videos/$fname-$(date '+%y%m%d-%H%M-%S').mkv"


    


    The stdout of the ffmpeg https://pastebin.com/Qmi5TMKv

    


    ffmpeg version n5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
[x11grab @ 0x561faf77eb00] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1658814267.169414, bitrate: 2014248 kb/s
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 2014248 kb/s, 60 fps, 1000k tbr, 1000k tbn
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1658814267.230653, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> vorbis (native))
Press [q] to stop, [?] for help
[libx264 @ 0x561faf7d4300] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA3 BMI1
[libx264 @ 0x561faf7d4300] profile High 4:4:4 Predictive, level 3.2, 4:4:4, 8-bit
[libx264 @ 0x561faf7d4300] 264 - core 164 r3081 19856cc - H.264/MPEG-4 AVC codec - Copyleft 2003-2021 - 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
[alsa @ 0x561faf78a940] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
Output #0, matroska, to '/home/earth/Videos/-220726-1114-27.mkv':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p(tv, progressive), 1366x768, q=2-31, 30 fps, 1k tbn
    Metadata:
      encoder         : Lavc59.18.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc59.18.100 vorbis
[vorbis @ 0x561faf7d5500] Queue input is backward in time0 bitrate=N/A speed=   0x
frame=  153 fps= 31 q=-1.0 Lsize=    2295kB time=00:00:05.06 bitrate=3709.5kbits/s dup=0 drop=150 speed=1.01x
video:2282kB audio:7kB subtitle:0kB other streams:0kB global headers:3kB muxing overhead: 0.281689%
[libx264 @ 0x561faf7d4300] frame I:1     Avg QP: 0.00  size:381729
[libx264 @ 0x561faf7d4300] frame P:152   Avg QP: 0.00  size: 12857
[libx264 @ 0x561faf7d4300] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x561faf7d4300] mb P  I16..4: 56.3%  0.0%  0.0%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:43.6%
[libx264 @ 0x561faf7d4300] coded y,u,v intra: 1.6% 1.6% 1.6% inter: 0.2% 0.2% 0.2%
[libx264 @ 0x561faf7d4300] i16 v,h,dc,p: 99%  1%  0%  0%
[libx264 @ 0x561faf7d4300] kb/s:3664.27
Exiting normally, received signal 15.


    


    I am using the preset ultrafast because I read that it helps not to compress the video too much.
The output of the recorded test file using ffmpeg is as below.

    


     (+) Video --vid=1 (h264 1366x768 30.000fps)
 (+) Audio --aid=1 (vorbis 2ch 48000Hz)
AO: [pulse] 48000Hz stereo 2ch float
VO: [gpu] 1366x768 yuv444p
AV: 00:00:03 / 00:00:19 (17%) A-V:  0.000
[mkv] Discarding potentially broken or useless index.
AV: 00:00:14 / 00:00:19 (73%) A-V:  0.000

Exiting... (Quit)


    


    The recording works but there is a audio lag. If I record the same using simplescreenrecorder with the same settings like,

    


    audio backend - alsa

    


    source - default

    


    audio codec - vorbis

    


    video codec - h.264

    


    container - matroska

    


    preset - superfast

    


    The simplescreenrecorder log https://pastebin.com/83hMMRQF

    


    [PageRecord::StartPage] Starting page ...
[PageRecord::StartPage] Started page.
[PageRecord::StartOutput] Starting output ...
[PageRecord::StartOutput] Output file: /home/earth/Videos/simplescreenrecorder-2022-07-26_11.18.13.mkv
[Muxer::Init] Using format matroska (Matroska).
[Muxer::AddStream] Using codec libx264 (libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10).
[VideoEncoder::PrepareStream] Using pixel format nv12.
[libx264 @ 0x563436cbfd40] using SAR=1/1
[libx264 @ 0x563436cbfd40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA3 BMI1
[libx264 @ 0x563436cbfd40] profile High, level 3.2, 4:2:0, 8-bit
[libx264 @ 0x563436cbfd40] 264 - core 164 r3081 19856cc - H.264/MPEG-4 AVC codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=1:1.00
[Muxer::AddStream] Using codec libvorbis (libvorbis).
[BaseEncoder::EncoderThread] Encoder thread started.
[AudioEncoder::PrepareStream] Using sample format f32p.
[BaseEncoder::EncoderThread] Encoder thread started.
[Muxer::MuxerThread] Muxer thread started.
[PageRecord::StartOutput] Started output.
[Synchronizer::SynchronizerThread] Synchronizer thread started.
[PageRecord::StartInput] Starting input ...
[X11Input::Init] Using X11 shared memory.
[X11Input::Init] Detecting screen configuration ...
[X11Input::Init] Screen 0: x1 = 0, y1 = 0, x2 = 1366, y2 = 768
[X11Input::InputThread] Input thread started.
[ALSAInput::InputThread] Using sample format s16.
[PageRecord::StartInput] Started input.
[ALSAInput::InputThread] Input thread started.
[FastResampler::Resample] Resample ratio is 1.0000 (was 0.0000).
[PageRecord::StopOutput] Stopping output ...
[PageRecord::StopOutput] Stopped output.
[PageRecord::StopInput] Stopping input ...
[X11Input::~X11Input] Stopping input thread ...
[X11Input::InputThread] Input thread stopped.
[ALSAInput::~ALSAInput] Stopping input thread ...
[ALSAInput::InputThread] Input thread stopped.
[PageRecord::StopInput] Stopped input.


    


    It works perfectly without any lag whatsoever. The output of the recorded test file using simplescreenrecorder is as below.

    


     (+) Video --vid=1 (h264 1366x768)
 (+) Audio --aid=1 (vorbis 2ch 48000Hz)
AO: [pulse] 48000Hz stereo 2ch float
VO: [gpu] 1366x768 yuv420p
AV: 00:00:01 / 00:00:17 (7%) A-V:  0.000
[mkv] Discarding potentially broken or useless index.
AV: 00:00:08 / 00:00:17 (47%) A-V:  0.000

Exiting... (Quit)


    


    The only difference that I saw between these two recordings is VO: [gpu] 1366x768 yuv444p
VO: [gpu] 1366x768 yuv420p for ffmpeg and simplescreenrecorder receptively.
I do not know if this matters but is there something that I could tweak to make ffmpeg to capture the screen and audio without any lag.
Like answered here https://unix.stackexchange.com/questions/675436/ffmpeg-recording-slows-down-when-audio-inputs-are-added
I do open pavucontrol but its not much of a help.

    


    The reason that I going with ffmpeg is because I can kill the process using pid at a particular time using cronjobs.
These are my system information, in case if it helps

    


    System:
  Host: taco Kernel: 5.18.12-arch1-1 arch: x86_64 bits: 64 Desktop: dwm
    v: 6.2 Distro: Arch Linux
Machine:
  Type: Desktop Mobo: Acer model: A75F2-M v: P21-A1 serial: N/A BIOS: Acer
    v: P21-A1 date: 02/07/2014
CPU:
  Info: quad core model: AMD A8-5500B APU with Radeon HD Graphics bits: 64
    type: MT MCP cache: L2: 4 MiB
  Speed (MHz): avg: 1400 min/max: 1400/3200 cores: 1: 1400 2: 1400 3: 1400
    4: 1400
Graphics:
  Device-1: AMD Trinity [Radeon HD 7560D] driver: radeon v: kernel
  Display: server: X.Org v: 21.1.4 driver: X: loaded: modesetting
    gpu: radeon resolution: 1366x768~60Hz
  OpenGL: renderer: AMD ARUBA (DRM 2.50.0 / 5.18.12-arch1-1 LLVM 14.0.6)
    v: 4.3 Mesa 22.1.3
Audio:
  Device-1: AMD FCH Azalia driver: snd_hda_intel
  Sound Server-1: ALSA v: k5.18.12-arch1-1 running: yes
  Sound Server-2: PulseAudio v: 16.1 running: yes
  Sound Server-3: PipeWire v: 0.3.56 running: yes


    


    Any help is much appreciated.

    


  • Install ffmpeg on Centos6 x64 using FFmpegInstaller 8.0 Issue [on hold]

    21 mars 2017, par woshka

    I have the following issue while installing ffmpeginstaller8.0 on centos 6 x64
    on the mplayer installtion it fails as followes on cpu.c
    what is the issue and how to solve it ?

    Thanks

    EDIT : I have found the best solution to install ffmpeg and all of it’s libraries with this link enter link description here

    YASM    libavcodec/x86/vp9lpf_16bpp.o
    
YASM    libavcodec/x86/vp9itxfm_16bpp.o
    
YASM    libavcodec/x86/vp9lpf.o
    
YASM    libavcodec/x86/hevc_mc.o
    
YASM    libavcodec/x86/vp9itxfm.o
    
AR      libavcodec/libavcodec.a
    
make[1]: Leaving directory `/usr/src/ffmpegscript/mplayer/ffmpeg'
    
make -C ffmpeg libavutil/libavutil.a
    
make[1]: Entering directory `/usr/src/ffmpegscript/mplayer/ffmpeg'
    
CC      libavutil/cpu.o
    
libavutil/cpu.c:20:23: warning: stdatomic.h: No such file or directory
    
libavutil/cpu.c:28:5: warning: "HAVE_SCHED_GETAFFINITY" is not defined
    
libavutil/cpu.c:34:5: warning: "HAVE_GETPROCESSAFFINITYMASK" is not defined
    
libavutil/cpu.c:34:36: warning: "HAVE_WINRT" is not defined
    
libavutil/cpu.c:37:5: warning: "HAVE_SYSCTL" is not defined
    
libavutil/cpu.c:48: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'cpu_flags'
    
libavutil/cpu.c: In function 'av_force_cpu_flags':
    
libavutil/cpu.c:86: error: implicit declaration of function 'atomic_store_explicit'
    
libavutil/cpu.c:86: error: 'cpu_flags' undeclared (first use in this function)
    
libavutil/cpu.c:86: error: (Each undeclared identifier is reported only once
    
libavutil/cpu.c:86: error: for each function it appears in.)
    
libavutil/cpu.c:86: error: 'memory_order_relaxed' undeclared (first use in this function)
    
libavutil/cpu.c: In function 'av_get_cpu_flags':
    
libavutil/cpu.c:91: error: implicit declaration of function 'atomic_load_explicit'
    
libavutil/cpu.c:91: error: 'cpu_flags' undeclared (first use in this function)
    
libavutil/cpu.c:91: error: 'memory_order_relaxed' undeclared (first use in this function)
    
libavutil/cpu.c: In function 'av_set_cpu_flags_mask':
    
libavutil/cpu.c:101: error: 'cpu_flags' undeclared (first use in this function)
    
libavutil/cpu.c:102: error: 'memory_order_relaxed' undeclared (first use in this function)
    
libavutil/cpu.c:265:5: warning: "HAVE_WINRT" is not defined
    
libavutil/cpu.c:268:5: warning: "HAVE_SCHED_GETAFFINITY" is not defined
    
libavutil/cpu.c:275:7: warning: "HAVE_GETPROCESSAFFINITYMASK" is not defined
    
libavutil/cpu.c:279:7: warning: "HAVE_SYSCTL" is not defined
    
libavutil/cpu.c:285:7: warning: "HAVE_SYSCONF" is not defined
    
libavutil/cpu.c:287:7: warning: "HAVE_SYSCONF" is not defined
    
libavutil/cpu.c:289:7: warning: "HAVE_WINRT" is not defined
    
make[1]: *** [libavutil/cpu.o] Error 1
    
make[1]: Leaving directory `/usr/src/ffmpegscript/mplayer/ffmpeg'
    
make: *** [ffmpeg/libavutil/libavutil.a] Error 2
    
cp: cannot create regular file `/usr/local/cpffmpeg/etc/mplayer/codecs.conf': No such file or directory
    
Installation of mplayer.tar.gz ....... Completed
    

    

    
   Mplayer installation Failed :( ,  please contact  professional support sales@syslint.com

  • FFMPEG Failure - Extracting frames on large file

    25 avril 2018, par Marian Montagnino

    Calling the ffmpeg command :

    ffmpeg -y -ss "00:00:02" -i 5ccaea226acfc1b4b75ccd1a9f09512c.mxf -frames 30 -f image2 -vf "fps=1/1.25,scale='min(420,iw)':-1" video%04d.jpg

    Causes a failure :

    ffmpeg failed: ffmpeg version N-85692-g78a5fc4 Copyright (c) 2000-2017 the FFmpeg developers
    
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
    
configuration: --prefix=/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/include --extra-ldflags=-L/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/lib --bindir=/tmp/gm-ffmpeg-1.0.4/BUILDROOT/gm-ffmpeg-1.0.4-1.el7.centos.x86_64/opt/graymeta/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    
libavutil 55. 61.100 / 55. 61.100
    
libavcodec 57. 93.100 / 57. 93.100
    
libavformat 57. 72.101 / 57. 72.101
    
libavdevice 57. 7.100 / 57. 7.100
    
libavfilter 6. 87.100 / 6. 87.100
    
libswscale 4. 7.101 / 4. 7.101
    
libswresample 2. 8.100 / 2. 8.100
    
libpostproc 54. 6.100 / 54. 6.100
    
[mxf @ 0x2c6da60] broken or empty index
    
Input #0, mxf, from '/alloc/5ccaea226acfc1b4b75ccd1a9f09512c.mxf':
    
Metadata:
    
uid : 27b07007-2dc8-4305-a78a-81a612d78b94
    
generation_uid : ef5ae870-4075-4513-ea1f-39c0ed197267
    
company_name : Colorfront
    
product_name : Transkoder
    
product_uid : 3a4fe380-0d01-11e4-869f-3cd92b5c1dfc
    
product_version : 2.7.3.20150121
    
application_platform: Microsoft Windows 7 Professional Service Pack 1 (Build 7601)
    
modification_date: 2016-09-09T11:29:39.000000Z
    
material_package_umid: 0x060A2B340101010501010F20130000008991E1DCEA584837149E72E7F9F0E09D
    
timecode : 00:00:17;12
    
Duration: 00:11:58.92, start: 0.000000, bitrate: 150802 kb/s
    
Stream #0:0: Video: jpeg2000, yuv422p10le(progressive), 3840x2160, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 59.94 tbn, 59.94 tbc
    
Metadata:
    
file_package_umid: 0x060A2B340101010501010F2013000000F8B3B48BE8044408DDD6303A6D43F566
    
track_name : Picture
    
Stream mapping:
    
Stream #0:0 -> #0:0 (jpeg2000 (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    
: signal: killed

    I’m not sure how to interpret this error message and why it actually failed. This file is about 90GB large and shot in 4K resolution but 11 seconds long.

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