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  • Desktop audio falls behind when recording microphone + desktop audio + screen using ffmpeg

    15 septembre 2013, par madr

    I have put together this script for recording the microphone, the desktop audio and the screen using ffmpeg :

    DATE=`which date`
    
RESO=2560x1440
    
FPS=30
    
PRESET=ultrafast
    
DIRECTORY=$HOME/Video/
    
FILENAME=videocast`$DATE +%d%m%Y_%H.%M.%S`.mkv
    

    
ffmpeg -y -vsync 1 \
    
-f pulse -ac 2 -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor \
    
-f pulse -ac 1 -ar 25000 -i alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono \
    
-filter_complex aresample=async=1,amix=duration=shortest,apad \
    
-f x11grab -r $FPS -s $RESO -i :0.0 \
    
-acodec libvorbis \
    
-vcodec libx264 -pix_fmt yuv420p -preset $PRESET -threads 0 \
    
$DIRECTORY$FILENAME

    Everything is recorded and between the screen and the microphone sound there are no issues what so ever, however the desktop audio falls behind badly.

    It begins in sync but gets worse over time during playback, also in ffplay. It does not matter what application playing sound : both Youtube-videos in the browser, desktop sounds and Rhythmbox (playing a couple of seconds of song then stops, wait and repeat) gets out of sync.

    The terminal output complain about

    "ALSA lib pcm.c:7843:(snd_pcm_recover) overrun occurred22.73 bitrate=10384.5kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred"

    and similar but I do not know what that means.

    Full terminal output here :

    ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Aug 11 2013 14:52:28 with gcc 4.8.1 (GCC) 20130725 (prerelease)
    
  configuration: --prefix=/usr --disable-debug --disable-static --enable-avresample --enable-dxva2 --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
    
  libavutil      52. 38.100 / 52. 38.100
    
  libavcodec     55. 18.102 / 55. 18.102
    
  libavformat    55. 12.100 / 55. 12.100
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 79.101 /  3. 79.101
    
  libavresample   1.  1.  0 /  1.  1.  0
    
  libswscale      2.  3.100 /  2.  3.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, pulse, from 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor':
    
  Duration: N/A, start: 0.014093, bitrate: 1536 kb/s
    
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    
Guessed Channel Layout for  Input Stream #1.0 : mono
    
Input #1, pulse, from 'alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono':
    
  Duration: N/A, start: 0.006172, bitrate: 400 kb/s
    
    Stream #1:0: Audio: pcm_s16le, 25000 Hz, mono, s16, 400 kb/s
    
[x11grab @ 0x218a6e0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 2560 height: 1440
    
[x11grab @ 0x218a6e0] shared memory extension found
    
Input #2, x11grab, from ':0.0':
    
  Duration: N/A, start: 1379021580.184321, bitrate: N/A
    
    Stream #2:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 2560x1440, -2147483 kb/s, 30 tbr, 1000k tbn, 30 tbc
    
[libx264 @ 0x21ae560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x21ae560] profile Constrained Baseline, level 5.0
    
[libx264 @ 0x21ae560] 264 - core 133 r2339 585324f - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 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=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, matroska, to '/home/anders/Video/videocast12092013_23.33.00.mkv':
    
  Metadata:
    
    encoder         : Lavf55.12.100
    
    Stream #0:0: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 25000 Hz, mono, fltp
    
    Stream #0:1: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 2560x1440, q=-1--1, 1k tbn, 30 tbc
    
Stream mapping:
    
  Stream #0:0 (pcm_s16le) -> aresample (graph 0)
    
  Stream #1:0 (pcm_s16le) -> amix:input1 (graph 0)
    
  amix (graph 0) -> Stream #0:0 (libvorbis)
    
  Stream #2:0 -> #0:1 (rawvideo -> libx264)
    
Press [q] to stop, [?] for help
    
ALSA lib pcm.c:7843:(snd_pcm_recover) overrun occurred22.73 bitrate=10384.5kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred3.22 bitrate=10423.3kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) overrun occurred25.25 bitrate=11011.0kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred5.76 bitrate=11013.7kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) overrun occurred27.25 bitrate=11175.4kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred7.76 bitrate=11168.7kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred8.24 bitrate=11176.4kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) overrun occurred55.48 bitrate=11243.8kbits/s    
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred
    
ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred
    
frame=12871 fps= 30 q=-1.0 Lsize=  542369kB time=00:07:09.31 bitrate=10349.3kbits/s    
    
video:539762kB audio:2363kB subtitle:0 global headers:3kB muxing overhead 0.044476%
    
[libx264 @ 0x21ae560] frame I:52    Avg QP:15.46  size:725888
    
[libx264 @ 0x21ae560] frame P:12819 Avg QP:18.26  size: 40172
    
[libx264 @ 0x21ae560] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x21ae560] mb P  I16..4:  2.6%  0.0%  0.0%  P16..4: 18.1%  0.0%  0.0%  0.0%  0.0%    skip:79.3%
    
[libx264 @ 0x21ae560] coded y,uvDC,uvAC intra: 57.8% 49.8% 25.3% inter: 8.9% 8.7% 2.2%
    
[libx264 @ 0x21ae560] i16 v,h,dc,p: 23% 29% 32% 16%
    
[libx264 @ 0x21ae560] i8c dc,h,v,p: 45% 28% 18%  9%
    
[libx264 @ 0x21ae560] kb/s:10306.26

    Please help me, I am really close to get this working !

    UPDATE : The desktop audio is out of sync when skipping filter_complex and microphone also, bit in a smaller amount. Using copy instead of libvorbis does not change anything either.

  • FFMPEG gives Working Directory : null error

    5 décembre 2016, par Urvashi Patel

    I’m working in a video processing project and i’m using precompiled FFmpeg library for that.

    Now, ffmpeg file must be create under data/data/packageName/files/ directory in Android Device Monitor after compile library from gradle file.

    But ffmpeg file can’t be create. So, I got Exception as :

    java.io.IOException: Error running exec(). Command: [/data/data/com.example.videotomp3_ffmpeg/files/ffmpeg, -i, file:///android_asset/SampleVideo.mp4, -vn, -acodec, copy, /storage/emulated/0/VideoToMP3_FFmpeg/SampleMP3.mp3] Working Directory: null Environment: null

    Please tell me what can I do for solving this problem ?

  • FFMPEG & OPENGL - RAW Frames

    27 mars 2015, par Marco Reisacher

    I’m building a recorder using a BlackMagic DeckLink Card.
    The program is using OpenGL to display the Frames and FFMPEG (with the glReadPixels() method) to record them.
    I’m setting the viewport in my program to apply a automatic letter-/pillarbox whether the Image/Monitor is 16:9/4:3.
    The problem with that ist that when i capture these frames of this viewport they get of course recorded in the resolution my viewport is (i.e. Full Hd source -> viewport due to monitor with 1600x1200 resolution -> letterbox down to 1600x900) and so FFMPEG records those 1600x1200 with black bars at the top/bottom.

    Is there any possibility to grab the RAW Frame before it gets passed trough the setViewport function and all the rescaling stuff ?

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