I have a little device that takes "old" composite video and sends it out to USB. It's recognized by video4linux2 and I can watch the VHS tapes that I'm trying to capture using xawtv simply using:
v4lctl -c /dev/video2 setnorm NTSC v4lctl -c /dev/video2 movie fps 29.97 and then "xawtv" When I start xawtv it says it's getting audio from hw:3,0 I can also play the video, but *without*sound* using: ffplay -f v4l2 -i /dev/video2 -vf yadif and the picture is just great (well, for a home movie on VHS tape, at least!) but I get no sounds from this. I have tried capturing in a variety of formats, but always end up with a silent sound-track (if I don't specify explicitly that I want -f alsa and some audio source, I don't even get a sound track). Anway, there seems little point in dumping the output of half a dozen failures, This one I think is representative: If I try to do ffplay directly on the audio using: ffplay -f alsa -i plughw:3,0 I get a black window (not surprising, I didn't specify a video source!), silence, and the following output that runs for as long as I let it until I kill it with control-c. $ ffplay -f alsa -i plughw:3,0 ffplay version 4.2.4-1ubuntu0.1 Copyright (c) 2003-2020 the FFmpeg developers built with gcc 9 (Ubuntu 9.3.0-10ubuntu2) configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, alsa, from 'plughw:3,0': 0KB vq= 0KB sq= 0B f=0/0 Duration: N/A, start: 1598560765.378207, bitrate: 1536 kb/s Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s 1598560779.36 M-A: 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0 it seems to think there's "something there" (it doesn't reject "plughw:3,0" as bogus) and to have detected something with a format, yet, nothing. Any idea how to proceed? Can I get more information from xawtv perhaps that might help me know how it's succeeding and transfer that info to ffmpeg? TIA, Simon -- Simon Roberts (303) 249 3613 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".