On 27/08/2020 22:52, Simon Roberts wrote: > 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 > > Try using the line/mic input on the computer, not the audio cable to the USB device.
-- PvdH _______________________________________________ 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".