FFMPEGを使用して別のオーディオソースでWebカメラからmp4ビデオを録画するにはどうすればよいですか？
このコマンドを使用しようとしていますが、結果が遅れ、時々停止し、1秒後に音声が消えます。
オーディオ+ビデオ-動作しません
ffmpeg -f alsa -i hw:0,0 -f v4l2 -input_format mjpeg -i /dev/video0 -t 5 -strict -2 /var/www/html/tmp/temp.mp4 2>&1
オーディオとビデオの記録を分離した場合、結果は良好です。
ビデオ-作品
ffmpeg -f v4l2 -input_format mjpeg -i /dev/video0 -t 5 -strict -2 /var/www/html/tmp/temp.mp4 2>&1
オーディオ-作品
ffmpeg -f alsa -i hw:0,0 /var/www/html/tmp/temp.mp3 2>&1
私のコンソール出力：
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609 configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, alsa, from 'hw:0,0': Duration: N/A, start: 1540888842.634797, bitrate: 1536 kb/s Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s [mjpeg @ 0x2624fc0] Changeing bps to 8 Input #1, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 338379.214188, bitrate: N/A Stream #1:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 800x600, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc No pixel format specified, yuvj422p for H.264 encoding chosen. Use -pix_fmt yuv420p for compatibility with outdated media players. [libx264 @ 0x261ba40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2 [libx264 @ 0x261ba40] profile High 4:2:2, level 3.1, 4:2:2 8-bit [libx264 @ 0x261ba40] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to '/var/www/html/tmp/temp.mp4': Metadata: encoder : Lavf56.40.101 Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj422p(pc), 800x600, q=-1--1, 30 fps, 15360 tbn, 30 tbc Metadata: encoder : Lavc56.60.100 libx264 Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc56.60.100 aac Stream mapping: Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264)) Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native)) Press [q] to stop, [?] for help [alsa @ 0x26095c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) [alsa @ 0x26095c0] ALSA buffer xrun. [alsa @ 0x26095c0] ALSA buffer xrun. 137kB time=00:00:02.14 bitrate= 525.9kbits/s
[alsa @ 0x26095c0] ALSA buffer xrun. 185kB time=00:00:04.24 bitrate= 356.7kbits/s
frame= 150 fps= 27 q=-1.0 Lsize= 266kB time=00:00:04.93 bitrate= 441.0kbits/s
video:256kB audio:6kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.313912% [libx264 @ 0x261ba40] frame I:1 Avg QP:24.07 size: 34967 [libx264 @ 0x261ba40] frame P:38 Avg QP:24.04 size: 4175 [libx264 @ 0x261ba40] frame B:111 Avg QP:25.53 size: 613 [libx264 @ 0x261ba40] consecutive B-frames: 1.3% 0.0% 0.0% 98.7% [libx264 @ 0x261ba40] mb I I16..4: 19.9% 59.7% 20.4% [libx264 @ 0x261ba40] mb P I16..4: 2.3% 1.3% 0.0% P16..4: 74.9% 3.1% 5.5% 0.0% 0.0% skip:12.9% [libx264 @ 0x261ba40] mb B I16..4: 0.1% 0.1% 0.0% B16..8: 18.7% 0.1% 0.0% direct: 0.8% skip:80.2% L0:65.7% L1:33.1% BI: 1.1% [libx264 @ 0x261ba40] 8x8 transform intra:47.2% inter:91.3% [libx264 @ 0x261ba40] coded y,uvDC,uvAC intra: 29.6% 67.7% 14.6% inter: 3.9% 18.6% 0.7% [libx264 @ 0x261ba40] i16 v,h,dc,p: 28% 12% 6% 54% [libx264 @ 0x261ba40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 22% 39% 3% 3% 2% 5% 3% 4% [libx264 @ 0x261ba40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 36% 7% 3% 4% 4% 12% 3% 4% [libx264 @ 0x261ba40] i8c dc,h,v,p: 47% 19% 29% 5% [libx264 @ 0x261ba40] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x261ba40] ref P L0: 8.8% 4.4% 83.1% 3.7% [libx264 @ 0x261ba40] ref B L0: 14.5% 39.9% 45.6% [libx264 @ 0x261ba40] ref B L1: 29.6% 70.4% [libx264 @ 0x261ba40] kb/s:418.56
動作させるには、alsaをPulseに変更する必要がありました。
ffmpeg -f Pulse -ac 2 -i default -f v4l2 -i /dev/video0 -t 00:00:18 -vcodec libx264 -strict -2 /var/www/html/tmp/temp.mp4