Music&Video: Difference between revisions

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= PulseAudio =
= PulseAudio =


  pactl stat
  $ pactl info
 
  Server String: unix:/run/user/1000/pulse/native
  Currently in use: 17 blocks containing 216,3 KiB bytes total.
  Library Protocol Version: 32
  Allocated during whole lifetime: 947139 blocks containing 1,6 GiB bytes total.
  Server Protocol Version: 32
  Sample cache size: 0 B
  Is Local: yes
  Server String: /tmp/pulse-EPQnHaSCnLWC/native
  Client Index: 157
  Library Protocol Version: 26
  Tile Size: 65472
  Server Protocol Version: 26
  User Name: xxxxxxx
  Is Local: yes
  Host Name: xxxxxxx
  Client Index: 17
  Server Name: pulseaudio
  Tile Size: 65472
  Server Version: 10.0
  User Name: user
  Default Sample Specification: s16le 2ch 44100Hz
  Host Name: localhost
  Default Channel Map: front-left,front-right
  Server Name: pulseaudio
  Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
  Server Version: 2.0
  Default Source: alsa_input.pci-0000_00_1b.0.analog-stereo
  Default Sample Specification: s16le 2ch 44100Hz
  Cookie: 4aea:057c
  Default Channel Map: front-left,front-right
  $ pactl stat
  Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
  Currently in use: 1 blocks containing 63.9 KiB bytes total.
  Default Source: alsa_input.usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam.analog-mono
  Allocated during whole lifetime: 375708 blocks containing 2.7 GiB bytes total.
  Cookie: 9cec:902b
  Sample cache size: 0 B
 
 
  Module #0
        Name: module-device-restore
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Automatically restore the volume/mute state of devices"
                module.version = "2.0"
 
  Module #1
        Name: module-stream-restore
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Automatically restore the volume/mute/device state of streams"
                module.version = "2.0"
 
  Module #2
        Name: module-card-restore
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Automatically restore profile of cards"
                module.version = "2.0"
 
  Module #3
        Name: module-augment-properties
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Augment the property sets of streams with additional static information"
                module.version = "2.0"
 
  Module #4
        Name: module-alsa-card
        Argument: device_id="0" name="pci-0000_00_1b.0" card_name="alsa_card.pci-0000_00_1b.0" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes card_properties="module-udev-detect.discovered=1"
        Usage counter: 1
        Properties:
                module.author = "Lennart Poettering"
                module.description = "ALSA Card"
                module.version = "2.0"
 
  Module #5
        Name: module-alsa-card
        Argument: device_id="1" name="usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam" card_name="alsa_card.usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes card_properties="module-udev-detect.discovered=1"
        Usage counter: 0
        Properties:
                module.author = "Lennart Poettering"
                module.description = "ALSA Card"
                module.version = "2.0"
 
  Module #6
        Name: module-udev-detect
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Detect available audio hardware and load matching drivers"
                module.version = "2.0"
 
  Module #7
        Name: module-native-protocol-unix
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Native protocol (UNIX sockets)"
                module.version = "2.0"
 
  Module #8
        Name: module-default-device-restore
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Automatically restore the default sink and source"
                module.version = "2.0"
 
  Module #9
        Name: module-rescue-streams
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "When a sink/source is removed, try to move their streams to the default sink/source"
                module.version = "2.0"
 
  Module #10
        Name: module-always-sink
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Colin Guthrie"
                module.description = "Always keeps at least one sink loaded even if it's a null one"
                module.version = "2.0"
 
  Module #11
        Name: module-intended-roles
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Automatically set device of streams based of intended roles of devices"
                module.version = "2.0"
 
  Module #12
        Name: module-suspend-on-idle
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "When a sink/source is idle for too long, suspend it"
                module.version = "2.0"
 
  Module #13
        Name: module-console-kit
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Create a client for each ConsoleKit session of this user"
                module.version = "2.0"
 
  Module #14
        Name: module-systemd-login
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Create a client for each login session of this user"
                module.version = "2.0"
 
  Module #15
        Name: module-position-event-sounds
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Lennart Poettering"
                module.description = "Position event sounds between L and R depending on the position on screen of the widget triggering them."
                module.version = "2.0"
 
  Module #16
        Name: module-filter-heuristics
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Colin Guthrie"
                module.description = "Detect when various filters are desirable"
                module.version = "2.0"
 
  Module #17
        Name: module-filter-apply
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Colin Guthrie"
                module.description = "Load filter sinks automatically when needed"
                module.version = "2.0"
 
  Module #18
        Name: module-dbus-protocol
        Argument:
        Usage counter: n/a
        Properties:
                module.author = "Tanu Kaskinen"
                module.description = "D-Bus interface"
                module.version = "2.0"
 
  Module #19
        Name: module-switch-on-port-available
        Argument:
        Usage counter: n/a
        Properties:
 
 
  Sink #0
        State: SUSPENDED
        Name: alsa_output.pci-0000_00_1b.0.analog-stereo
        Description: Built-in Audio Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 48000Hz
        Channel Map: front-left,front-right
        Owner Module: 4
        Mute: no
        Volume: 0:  19% 1:  19%
                0: -42,60 dB 1: -42,60 dB
                balance 0,00
        Base Volume: 100%
                    0,00 dB
        Monitor Source: alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "STAC9200 Analog"
                alsa.id = "STAC9200 Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xefebc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.name = "NM10/ICH7 Family High Definition Audio Controller"
                device.form_factor = "internal"
                device.string = "front:0"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "32768"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "Built-in Audio Analog Stereo"
                alsa.mixer_name = "SigmaTel STAC9200"
                alsa.components = "HDA:83847690,102801d4,00102201 HDA:14f12bfa,14f100c3,00090000"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Ports:
                analog-output: Analog Output (priority: 9900)
        Active Port: analog-output
        Formats:
                pcm
 
  Source #0
        State: SUSPENDED
        Name: alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
        Description: Monitor of Built-in Audio Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 4
        Mute: no
        Volume: 0: 100% 1: 100%
                0: 0,00 dB 1: 0,00 dB
                balance 0,00
        Base Volume: 100%
                    0,00 dB
        Monitor of Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY
        Properties:
                device.description = "Monitor of Built-in Audio Analog Stereo"
                device.class = "monitor"
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xefebc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.name = "NM10/ICH7 Family High Definition Audio Controller"
                device.form_factor = "internal"
                device.string = "0"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Formats:
                pcm
 
  Source #1
        State: SUSPENDED
        Name: alsa_input.pci-0000_00_1b.0.analog-stereo
        Description: Built-in Audio Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 4
        Mute: no
        Volume: 0:  53% 1:  53%
                0: -16,50 dB 1: -16,50 dB
                balance 0,00
        Base Volume:  42%
                    -22,50 dB
        Monitor of Sink: n/a
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "STAC9200 Analog"
                alsa.id = "STAC9200 Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xefebc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.name = "NM10/ICH7 Family High Definition Audio Controller"
                device.form_factor = "internal"
                device.string = "front:0"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "32768"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "Built-in Audio Analog Stereo"
                alsa.mixer_name = "SigmaTel STAC9200"
                alsa.components = "HDA:83847690,102801d4,00102201 HDA:14f12bfa,14f100c3,00090000"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Ports:
                analog-input-microphone-front: Front Microphone (priority: 8500, not available)
                analog-input-microphone-rear: Rear Microphone (priority: 8200, not available)
                analog-input-linein: Line In (priority: 8100)
        Active Port: analog-input-linein
        Formats:
                pcm
 
  Source #2
        State: SUSPENDED
        Name: alsa_input.usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam.analog-mono
        Description: Webcam SPC1030NC Analog Mono
        Driver: module-alsa-card.c
        Sample Specification: s16le 1ch 48000Hz
        Channel Map: mono
        Owner Module: 5
        Mute: no
        Volume: 0:  88%
                0: -3,40 dB
                balance 0,00
        Base Volume:  34%
                    -28,00 dB
        Monitor of Sink: n/a
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "USB Audio"
                alsa.id = "USB Audio"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "1"
                alsa.card_name = "Philips SPC 1030NC Webcam"
                alsa.long_card_name = "Philips CE Philips SPC 1030NC Webcam at usb-0000:00:1d.7-8.3.3, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1d.7-usb-0:8.3.3:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:1d.7/usb5/5-8/5-8.3/5-8.3.3/5-8.3.3:1.2/sound/card1"
                udev.id = "usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam"
                device.bus = "usb"
                device.vendor.id = "0471"
                device.vendor.name = "Philips (or NXP)"
                device.product.id = "2036"
                device.product.name = "Webcam SPC1030NC"
                device.serial = "Philips_CE_Philips_SPC_1030NC_Webcam"
                device.form_factor = "webcam"
                device.string = "hw:1"
                device.buffering.buffer_size = "176400"
                device.buffering.fragment_size = "88200"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-mono"
                device.profile.description = "Analog Mono"
                device.description = "Webcam SPC1030NC Analog Mono"
                alsa.mixer_name = "USB Mixer"
                alsa.components = "USB0471:2036"
                module-udev-detect.discovered = "1"
                device.icon_name = "camera-web-usb"
        Ports:
                analog-input-microphone: Microphone (priority: 8700)
        Active Port: analog-input-microphone
        Formats:
                pcm
 
  Sink Input #97
        Driver: protocol-native.c
        Owner Module: 7
        Client: 13
        Sink: 0
        Sample Specification: s16le 2ch 48000Hz
        Channel Map: front-left,front-right
        Format: pcm, format.sample_format = "\"s16le\""  format.rate = "48000"  format.channels = "2"  format.channel_map = "\"front-left,front-right\""
        Mute: no
        Volume: 0:  19% 1:  19%
                0: -42,60 dB 1: -42,60 dB
                balance 0,00
        Buffer Latency: 496416 usec
        Sink Latency: 0 usec
        Resample method: n/a
        Properties:
                media.name = "ALSA Playback"
                application.name = "ALSA plug-in [mplayer1]"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "26"
                application.process.id = "7147"
                application.process.user = "user"
                application.process.host = "localhost"
                application.process.binary = "mplayer1"
                application.language = "C"
                window.x11.display = ":0"
                application.process.machine_id = "0adf833fd21f786cd7b886f64b081869"
                application.process.session_id = "0adf833fd21f786cd7b886f64b081869-1408381524.671640-187569320"
                module-stream-restore.id = "sink-input-by-application-name:ALSA plug-in [mplayer1]"
 
  Client #0
        Driver: module-console-kit.c
        Owner Module: 13
        Properties:
                application.name = "ConsoleKit Session /org/freedesktop/ConsoleKit/Session1"
                console-kit.session = "/org/freedesktop/ConsoleKit/Session1"
 
  Client #5
        Driver: protocol-native.c
        Owner Module: 7
        Properties:
                application.name = "ALSA plug-in [kmix]"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "26"
                application.process.id = "6978"
                application.process.user = "user"
                application.process.host = "localhost"
                application.process.binary = "kmix"
                application.language = "bg_BG.UTF-8"
                window.x11.display = ":0"
                application.process.machine_id = "0adf833fd21f786cd7b886f64b081869"
                application.process.session_id = "0adf833fd21f786cd7b886f64b081869-1408381524.671640-187569320"
 
  Client #6
        Driver: protocol-native.c
        Owner Module: 7
        Properties:
                application.name = "Skype"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "26"
                application.process.id = "6996"
                application.process.user = "user"
                application.process.host = "localhost"
                application.process.binary = "skype"
                application.language = "bg_BG.UTF-8"
                window.x11.display = ":0"
                application.process.machine_id = "0adf833fd21f786cd7b886f64b081869"
                application.process.session_id = "0adf833fd21f786cd7b886f64b081869-1408381524.671640-187569320"
 
  Client #13
        Driver: protocol-native.c
        Owner Module: 7
        Properties:
                application.name = "ALSA plug-in [mplayer1]"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "26"
                application.process.id = "7147"
                application.process.user = "user"
                application.process.host = "localhost"
                application.process.binary = "mplayer1"
                application.language = "C"
                window.x11.display = ":0"
                application.process.machine_id = "0adf833fd21f786cd7b886f64b081869"
                application.process.session_id = "0adf833fd21f786cd7b886f64b081869-1408381524.671640-187569320"
 
  Client #18
        Driver: protocol-native.c
        Owner Module: 7
        Properties:
                application.name = "pactl"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "26"
                application.process.id = "8079"
                application.process.user = "user"
                application.process.host = "localhost"
                application.process.binary = "pactl"
                application.language = "bg_BG.UTF-8"
                window.x11.display = ":0"
                application.process.machine_id = "0adf833fd21f786cd7b886f64b081869"
                application.process.session_id = "0adf833fd21f786cd7b886f64b081869-1408381524.671640-187569320"
 
  Card #0
        Name: alsa_card.pci-0000_00_1b.0
        Driver: module-alsa-card.c
        Owner Module: 4
        Properties:
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xefebc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.name = "NM10/ICH7 Family High Definition Audio Controller"
                device.form_factor = "internal"
                device.string = "0"
                device.description = "Built-in Audio"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Profiles:
                output:analog-stereo: Analog Stereo Output (sinks: 1, sources: 0, priority. 6000)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (sinks: 1, sources: 1, priority. 6060)
                output:analog-stereo+input:iec958-stereo: Analog Stereo Output + Digital Stereo (IEC958) Input (sinks: 1, sources: 1, priority. 6055)
                output:iec958-stereo: Digital Stereo (IEC958) Output (sinks: 1, sources: 0, priority. 5500)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (sinks: 1, sources: 1, priority. 5560)
                output:iec958-stereo+input:iec958-stereo: Digital Stereo Duplex (IEC958) (sinks: 1, sources: 1, priority. 5555)
                input:analog-stereo: Analog Stereo Input (sinks: 0, sources: 1, priority. 60)
                input:iec958-stereo: Digital Stereo (IEC958) Input (sinks: 0, sources: 1, priority. 55)
                off: Off (sinks: 0, sources: 0, priority. 0)
        Active Profile: output:analog-stereo+input:analog-stereo
        Ports:
                analog-output: Analog Output (priority: 9900)
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-stereo+input:iec958-stereo
                analog-input-microphone-front: Front Microphone (priority: 8500, not available)
                        Part of profile(s): output:analog-stereo+input:analog-stereo, output:iec958-stereo+input:analog-stereo, input:analog-stereo
                analog-input-microphone-rear: Rear Microphone (priority: 8200, not available)
                        Part of profile(s): output:analog-stereo+input:analog-stereo, output:iec958-stereo+input:analog-stereo, input:analog-stereo
                analog-input-linein: Line In (priority: 8100)
                        Part of profile(s): output:analog-stereo+input:analog-stereo, output:iec958-stereo+input:analog-stereo, input:analog-stereo
                iec958-stereo-input: iec958-stereo-input (priority: 0)
                        Part of profile(s): output:analog-stereo+input:iec958-stereo, output:iec958-stereo+input:iec958-stereo, input:iec958-stereo
                iec958-stereo-output: Digital Output (S/PDIF) (priority: 0)
                        Part of profile(s): output:iec958-stereo, output:iec958-stereo+input:analog-stereo, output:iec958-stereo+input:iec958-stereo
 
  Card #1
        Name: alsa_card.usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam
        Driver: module-alsa-card.c
        Owner Module: 5
        Properties:
                alsa.card = "1"
                alsa.card_name = "Philips SPC 1030NC Webcam"
                alsa.long_card_name = "Philips CE Philips SPC 1030NC Webcam at usb-0000:00:1d.7-8.3.3, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1d.7-usb-0:8.3.3:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:1d.7/usb5/5-8/5-8.3/5-8.3.3/5-8.3.3:1.2/sound/card1"
                udev.id = "usb-Philips_CE_Philips_SPC_1030NC_Webcam-02-Webcam"
                device.bus = "usb"
                device.vendor.id = "0471"
                device.vendor.name = "Philips (or NXP)"
                device.product.id = "2036"
                device.product.name = "Webcam SPC1030NC"
                device.serial = "Philips_CE_Philips_SPC_1030NC_Webcam"
                device.form_factor = "webcam"
                device.string = "1"
                device.description = "Webcam SPC1030NC"
                module-udev-detect.discovered = "1"
                device.icon_name = "camera-web-usb"
        Profiles:
                input:analog-mono: Analog Mono Input (sinks: 0, sources: 1, priority. 1)
                off: Off (sinks: 0, sources: 0, priority. 0)
        Active Profile: input:analog-mono
        Ports:
                analog-input-microphone: Microphone (priority: 8700)
                        Part of profile(s): input:analog-mono

Revision as of 11:51, 23 December 2017

Convert MP4 to MP3 files

  • general options
ffmpeg -v 5 -y -i input.mp4 -acodec libmp3lame -ac 2 -ab 192k output.mp3
  • general from scipt *
ffmpeg -v 5 -y -i input.mp4 -acodec libmp3lame -ac 2 -ab 192k output.mp3 < /dev/null
  • useful for me
rm /tmp/script.sh; ls | while read line; do \
  echo ">>"$line; out=$(echo $line| sed s:mp4$::); \
  echo 'ffmpeg -v 32 -y -i "'$line'" -acodec libmp3lame -ac 2 -ab 192k "'$out'mp3" < /dev/null' >> /tmp/script.sh; \
 done ; \
bash /tmp/script.sh

Mplayer and usb camera

mplayer -fps 10 -tv driver=v4l2:width=640:height=480:device=/dev/video0 tv://

3 steps to find out and test a microphone on linux with alsa

1) find out cards and inputs 

shell> cat /proc/asound/cards
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xff950000 irq 22
 1 [HVR900         ]: USB-Audio - WinTV HVR-900
                      WinTV HVR-900 at usb-0000:00:1a.7-3, high speed
 2 [Webcam         ]: USB-Audio - Philips SPC 1000NC Webcam
                      Philips CE Philips SPC 1000NC Webcam at
usb-0000:00:1a.7-5.4, high speed

=> I'm going to use the Webcam built in mic => card # 2

2) find out the input 

shell> cat /proc/asound/devices
  0: [ 0]   : control
  1:        : sequencer
  6: [ 0- 2]: hardware dependent
  7: [ 0- 3]: hardware dependent
 16: [ 0- 0]: digital audio playback
 17: [ 0- 1]: digital audio playback
 19: [ 0- 3]: digital audio playback
 24: [ 0- 0]: digital audio capture
 32: [ 1]   : control
 33:        : timer
 56: [ 1- 0]: digital audio capture
 64: [ 2]   : control
 88: [ 2- 0]: digital audio capture

=> my input is the capture on the second card 

 88: [ 2- 0]: digital audio capture

3) so no we can test the mic 

shell> arecord -c1 -Dplughw:2,0 -f cd -vv /dev/null

PulseAudio

  $ pactl  info
  Server String: unix:/run/user/1000/pulse/native
  Library Protocol Version: 32
  Server Protocol Version: 32
  Is Local: yes
  Client Index: 157
  Tile Size: 65472
  User Name: xxxxxxx
  Host Name: xxxxxxx
  Server Name: pulseaudio
  Server Version: 10.0
  Default Sample Specification: s16le 2ch 44100Hz
  Default Channel Map: front-left,front-right
  Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
  Default Source: alsa_input.pci-0000_00_1b.0.analog-stereo
  Cookie: 4aea:057c
  $ pactl stat
  Currently in use: 1 blocks containing 63.9 KiB bytes total.
  Allocated during whole lifetime: 375708 blocks containing 2.7 GiB bytes total.
  Sample cache size: 0 B
Retrieved from "http://deloptes.org/wiki/index.php?title=Music%26Video&oldid=266"