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    13 avril 2011, par

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    31 janvier 2010, par

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Sur d’autres sites (10307)

  • 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.

  • Audio is not playing properly in ffmpeg player

    23 septembre 2013, par user1241903

    I need to create a player which will decrypt the input on-fly and play the content.
    I have choosen ffmpeg libs (libav*) to create player and to start I have followed this link

    but audio is not playing properly,video is playing fine.
    I am using ubuntu 12.04LTS 64bit OS with the following ffmpeg version,

    admin@vz-X401A1:~$ ffmpeg 
    
ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Sep 11 2013 13:46:26 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
  configuration: --prefix=/home/admin/ffmpeg_build --extra-cflags=-I/home/admin/ffmpeg_build/include --extra-ldflags=-L/home/admin/ffmpeg_build/lib --bindir=/home/admin/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
    
  libavutil      52. 43.100 / 52. 43.100
    
  libavcodec     55. 31.101 / 55. 31.101
    
  libavformat    55. 16.102 / 55. 16.102
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 84.100 /  3. 84.100
    
  libswscale      2.  5.100 /  2.  5.100
    
  libswresample   0. 17.103 /  0. 17.103
    
  libpostproc    52.  3.100 / 52.  3.100
    
Hyper fast Audio and Video encoder
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
    

    
Use -h to get full help or, even better, run 'man ffmpeg'
    
admin@vz-X401A1:~$

    and downloaded tutorial07.c from this link

    still, with this also, sound is not playing properly.

    I need help to solve the following issues,

    1. How can I fix this audio issue(I have gone through similar question in StackOverflow and installed old ver. of ffmpeg, but issue still remains).

    2. And also suggest some steps or tutorial, how to implement on-fly decryption process (in C) and integrate this with the player.

  • Is there a chance to check why a videostream on IOS does not work ?

    13 septembre 2013, par mazleu

    I have a very strange problem.

    To stream videos I use AMS (Adobe Media Server)
    This works fine for the most Videos.
    But 4 videos do not work on iOS devices. The first seconds work but then the Video break.
    All Videos (over 1000) are convertet with the same ffmpeg settings.

    I try other settings and other converters but the Result are the same.

    Is there any opportunity to show why IOS don't like this 4 Videos ?

    Mediainfo form a failed video :

    MediaInfoLib - v0.7.62
    

    
General
    
Complete name                       : ---
    
Format                              : MPEG-4
    
Format profile                      : Base Media
    
Codec ID                            : isom
    
File size                           : 91.3 MiB
    
Duration                            : 24mn 27s
    
Overall bit rate mode               : Variable
    
Overall bit rate                    : 522 Kbps
    
Encoded date                        : UTC 2013-09-12 14:24:13
    
Tagged date                         : UTC 2013-09-12 14:24:13
    

    
Video
    
ID                                  : 1
    
Format                              : AVC
    
Format/Info                         : Advanced Video Codec
    
Format profile                      : High@L4.1
    
Format settings, CABAC              : Yes
    
Format settings, ReFrames           : 4 frames
    
Codec ID                            : avc1
    
Codec ID/Info                       : Advanced Video Coding
    
Duration                            : 24mn 27s
    
Bit rate                            : 387 Kbps
    
Maximum bit rate                    : 4 885 Kbps
    
Width                               : 1 280 pixels
    
Height                              : 720 pixels
    
Display aspect ratio                : 16:9
    
Frame rate mode                     : Constant
    
Frame rate                          : 30.000 fps
    
Color space                         : YUV
    
Chroma subsampling                  : 4:2:0
    
Bit depth                           : 8 bits
    
Scan type                           : Progressive
    
Bits/(Pixel*Frame)                  : 0.014
    
Stream size                         : 67.7 MiB (74%)
    
Writing library                     : x264 core 130 r2273 b3065e6
    
Encoding settings                   : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / 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_lookahead=30 / rc=crf / mbtree=1 / crf=28.0 / qcomp=0.70 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=50000 / vbv_bufsize=50000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:0.60
    
Encoded date                        : UTC 2013-09-12 14:24:13
    
Tagged date                         : UTC 2013-09-12 14:24:16
    

    
Audio
    
ID                                  : 2
    
Format                              : AAC
    
Format/Info                         : Advanced Audio Codec
    
Format profile                      : LC
    
Codec ID                            : 40
    
Duration                            : 24mn 27s
    
Bit rate mode                       : Variable
    
Bit rate                            : 132 Kbps
    
Maximum bit rate                    : 172 Kbps
    
Channel(s)                          : 2 channels
    
Channel positions                   : Front: L R
    
Sampling rate                       : 48.0 KHz
    
Compression mode                    : Lossy
    
Delay relative to video             : 67ms
    
Stream size                         : 22.7 MiB (25%)
    
Encoded date                        : UTC 2013-09-12 14:24:15
    
Tagged date                         : UTC 2013-09-12 14:24:16

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