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On Wed, Sep 18, 2019 at 11:16:41AM +0100, Mick wrote |
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> On Wednesday, 18 September 2019 10:10:16 BST Walter Dnes wrote: |
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> > |
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> > ffmpeg -f alsa -ac 2 -i hw:0 -video_size 1920x1080 -framerate 25 -f x11grab |
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> > -i :0.0 output.mp4 |
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> |
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> The above should work, but only if your active audio card has Card |
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> ID 0. If your PC uses HDMI as the first card you'll need to adjust |
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> /etc/asound.conf accordingly to switch to your analogue audio device, |
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> or perhaps try hw:1 in the above incantation instead. |
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"aplay -l" outputs |
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**** List of PLAYBACK Hardware Devices **** |
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card 0: PCH [HDA Intel PCH], device 0: CX20641 Analog [CX20641 Analog] |
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Subdevices: 0/1 |
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Subdevice #0: subdevice #0 |
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card 0: PCH [HDA Intel PCH], device 3: Generic Digital [Generic Digital] |
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Subdevices: 1/1 |
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Subdevice #0: subdevice #0 |
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If I try "hw:1" it dies immediately (No such file or directory) |
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No /etc/asound.conf or $HOME/.asoundrc on my system. But there is a |
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large (9596 bytes) /usr/share/alsa/alsa.conf |
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> Also, check your Mic is not muted with alsamixer, or your desktop GUI |
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> equivalent. |
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Enabled them, but no difference. |
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> Did you try USE="alsa, -speex"? |
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"emerge -pv mlayer" shows that speex is disabled. |
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The console I launch ffmpeg from shows a lot of stuff like... |
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[alsa @ 0x559c480c94c0] ALSA buffer xrun. |
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frame= 2337 fps= 25 q=28.0 size= 11008kB time=00:01:33.05 bitrate= 969.1kbits/frame= 2350 fps= 25 q=28.0 size= 11008kB time=00:01:33.05 bitrate= 969.1kbits/frame= 2362 fps= 25 q=28.0 size= 11008kB time=00:01:33.05 bitrate= 969.1kbits/frame= 2375 fps= 25 q=28.0 size= 11008kB time=00:01:33.05 bitrate= 969.1kbits/[alsa @ 0x559c480c94c0] ALSA buffer xrun. |
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frame= 2387 fps= 25 q=28.0 size= 11264kB time=00:01:35.21 bitrate= 969.2kbits/frame= 2400 fps= 25 q=28.0 size= 11264kB time=00:01:35.21 bitrate= 969.2kbits/frame= 2412 fps= 25 q=28.0 size= 11264kB time=00:01:35.21 bitrate= 969.2kbits/frame= 2425 fps= 25 q=28.0 size= 11264kB time=00:01:35.21 bitrate= 969.2kbits/[alsa @ 0x559c480c94c0] ALSA buffer xrun. |
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When I playback with mplayer and exit, there's a bunch of diagnostics. |
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Towards the end it says... |
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========================================================================== |
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Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders |
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AUDIO: 48000 Hz, 2 ch, floatle, 0.1 kbit/0.00% (ratio: 17->384000) |
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Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio)) |
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========================================================================== |
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AO: [alsa] 48000Hz 2ch floatle (4 bytes per sample) |
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Starting playback... |
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Could not find matching colorspace - retrying with -vf scale... |
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Opening video filter: [scale] |
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Movie-Aspect is undefined - no prescaling applied. |
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[swscaler @ 0x7f28e3f20100]bicubic scaler, from yuv444p to yuv420p using MMXEXT |
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VO: [xv] 1920x1080 => 1920x1080 Planar YV12 |
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A: 38.9 V: 35.9 A-V: 3.003 ct: 3.588 0/ 0 17% 12% 0.0% 0 0 |
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Timing looks severely broken, resetting |
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A: 38.9 V: 39.6 A-V: -0.717 ct: 3.805 0/ 0 17% 12% 0.0% 0 0 |
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The message about timing may be a clue. |
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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I don't run "desktop environments"; I run useful applications |
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