Is it the 40kb/s under Format, or is it the 16kb/s under Stream? What is the relationship between the Format and the Stream?
The below output is for a file generated using Core Audio on an iphone, with an Audio Unit. The output format was specified by an AudioStreamBasicDescription descriptor
Updated:
Output from ffprobe -v error -show_format -show_streams 123_1429602551009.051025.m4a :
[STREAM]
index=0
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/8000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=8000
channels=1
channel_layout=mono
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/8000
start_pts=0
start_time=0.000000
duration_ts=43008
duration=5.376000
bit_rate=16501
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=42
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
TAG:creation_time=1970-04-16 22:36:01
TAG:language=eng
[/STREAM]
[FORMAT]
filename=123_1429602551009.051025.m4a
nb_streams=1
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=5.376000
size=27473
bit_rate=40882
probe_score=100
TAG:major_brand=M4A
TAG:minor_version=0
TAG:compatible_brands=M4A mp42isom
TAG:creation_time=1970-04-16 22:36:01
TAG:iTunSMPB= 00000000 00000840 00000361 0000000000009C5F 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[/FORMAT]
The format bitrate is the overall bitrate, in your case 40 kb/s. 16kb is the bitrate of the AAC audio stream found in your m4a container.
Related
I have a USB audio-video capture device, something used to digitize video cassettes. I want to record both the video and audio from the device to a video file that has dimensions 720x576 and video codec H.264 and good audio quality.
I am able to record video from the device using ffmpeg and I am able to see video from the device using MPlayer. I am able also to see that audio is being delivered from the device to the computer by looking at Input tab of the Sound Preferences window or by recording the audio using Audacity, however the audio gets delivered from the device apparently only when the video is being accessed using ffmpeg or MPlayer.
I have tried to get ffmpeg to record the audio and I have tried to get MPlayer to play the audio and my efforts have not been successful.
The device is "Pinnacle Dazzle DVC 90/100/101" (as returned by v4l2-ctl --list-devices). The sound cards listing shows it as "DVC100":
$ cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0x601d118000 irq 171
1 [DVC100 ]: USB-Audio - DVC100
Pinnacle Systems GmbH DVC100 at usb-0000:00:14.0-4, high speed
29 [ThinkPadEC ]: ThinkPad EC - ThinkPad Console Audio Control
ThinkPad Console Audio Control at EC reg 0x30, fw N2LHT33W
The PulseAudio listing for the device is as follows:
$ pactl list cards short
0 alsa_card.pci-0000_00_1f.3 module-alsa-card.c
14 alsa_card.usb-Pinnacle_Systems_GmbH_DVC100-01 module-alsa-card.c
The following ffmpeg command successfully records video, but records severely distorted, broken and out-of-sync audio:
ffmpeg -y -f rawvideo -f alsa -thread_queue_size 2048 -ar 48000 -i hw:0 \
-c:a aac -video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4
The following MPlayer command successfully displays the video but does not play the audio:
mplayer -tv driver=v4l2:norm=PAL:device=/dev/video2:width=720:height=576 \
-ao alsa:device=hw=1.0 -vf pp=lb tv://
Now, when the above MPlayer command is running (not the ffmpeg command) and displaying the input video in a window, Audacity can be opened and set recording audio, and it records the audio from the device clearly and in good quality. While Audacity is doing this, the input device is listed in pavucontrol as "Dazzle DVC Audio Device Analogue Stereo". Equivalently, arecord can be used also to record the audio using the following command (with output shown):
$ arecord -vv -D plughw:DVC100 -fdat out.wav
Recording WAVE 'out.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Plug PCM: Hardware PCM card 1 'DVC100' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 24000
period_size : 6000
period_time : 125000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 6000
period_event : 0
start_threshold : 1
stop_threshold : 24000
silence_threshold: 0
silence_size : 0
boundary : 6755399441055744000
appl_ptr : 0
hw_ptr : 0
Looking at the output of arecord -L, I tried a variety of audio device input names with ffmpeg and none of them seemed to work. So, for example, I tried commands like the following:
ffmpeg -y -f rawvideo -f alsa -i plughw:DVC100 \
-video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4
And tried the following audio device names:
plughw:DVC100
plughw:CARD=DVC100,DEV=0
hw:CARD=DVC100,DEV=0
plughw:CARD=DVC100
sysdefault:CARD=DVC100
iec958:CARD=DVC100,DEV=0
dsnoop:CARD=DVC100,DEV=0
So, how might I get ffmpeg to record the audio successfully to the video file? Is there some alternative approach to this problem?
EDIT: The relevant output from the command pactl list sources is as follows:
Source #20
State: SUSPENDED
Name: alsa_input.usb-Pinnacle_Systems_GmbH_DVC100-01.analog-stereo
Description: Dazzle DVC100 Audio Device Analogue Stereo
Driver: module-alsa-card.c
Sample Specification: s16le 2ch 48000Hz
Channel Map: front-left,front-right
Owner Module: 45
Mute: no
Volume: front-left: 99957 / 153% / 11.00 dB, front-right: 99957 / 153% / 11.00 dB
balance 0.00
Base Volume: 35466 / 54% / -16.00 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 = "DVC100"
alsa.long_card_name = "Pinnacle Systems GmbH DVC100 at usb-0000:00:14.0-4, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:4:1.1"
sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1/sound/card1"
udev.id = "usb-Pinnacle_Systems_GmbH_DVC100-01"
device.bus = "usb"
device.vendor.id = "2304"
device.vendor.name = "Pinnacle Systems, Inc."
device.product.id = "021a"
device.product.name = "Dazzle DVC100 Audio Device"
device.serial = "Pinnacle_Systems_GmbH_DVC100"
device.string = "front:1"
device.buffering.buffer_size = "352800"
device.buffering.fragment_size = "176400"
device.access_mode = "mmap+timer"
device.profile.name = "analog-stereo"
device.profile.description = "Analogue Stereo"
device.description = "Dazzle DVC100 Audio Device Analogue Stereo"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB2304:021a"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
Ports:
analog-input-linein: Line In (priority: 8100)
Active Port: analog-input-linein
Formats:
pcm
I tested the name from this with ffmpeg (version 4.3.1, compiled with -enable-libpulse) in the following way:
ffmpeg -y -f video4linux2 -f pulse \
-i alsa_input.usb-Pinnacle_Systems_GmbH_DVC100-01.analog-stereo \
-video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4
Unfortunately this hasn't worked.
I also use Dazzle DVC100 to capture video and -f alsa -i hw:1 works well to me. For instance:
ffmpeg -f alsa -i hw:1 -i /dev/video2 \
-codec:v ffv1 -codec:a pcm_s16le raw.mkv
The number of the device can be found using:
cat /proc/asound/cards
Use the number in the first column after hw: prefix. In your case it is hw:1.
Keep in mind FFmpeg fails opening the device when PulsAudio device is opened. It happens to me when I am runnning pavucontrol at the same time for example. In practice I need to wait about a half of a minute after closing pavucontrol before running FFmpeg successfully.
You can check the output of FFmpeg in real time using:
ffmpeg -f alsa -i hw:1 -i /dev/video2 \
-codec:v ffv1 -codec:a pcm_s16le -f matroska - | ffplay -
You can find more information on capturing video using Dazzle DVC100 in my post.
I have to create a magic file that can detect a result of 42 on the 42nd byte.
I've created the following line to then compile
40 search 42 this is a 42 file
but when I run file -m <file_name> with this content
00000000 00000000 00000000 00000000 00042
I get the message
Warning: type `00000000 00000000 00000000 00042' invalid
file: could not find any valid magic files! (No such file or directory)
Your magic should be like this:
0 search/42 42 File containing "42"
!:mime text/x-42
Here's my test:
x#ubuntu:~$ cat testfile.txt
00000000 00000000 00000000 00000000 00042
x#ubuntu:~$ file -m magicfile.mgc testfile.txt
testfile.txt: File containing "42", ASCII text
x#ubuntu:~$
I am trying to record 4 channels with arecord but the last two are all zeros. I have a Behringer UMC404HD which is a 4 channel audio ADC with a USB port. I'm connecting it to machines running different flavors of linux (CentOS, Raspian, ubuntu and Pop!_OS). Only the CentOS one works correctly, giving me 4 channels; the others all seem to accept 4 channels but the last two channels are all 0s.
On the PopOS machine I used
arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: Generic [HD-Audio Generic], device 0: ALC293 Analog [ALC293 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: U192k [UMC404HD 192k], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
and got this
arecord --dump-hw-params -D plughw:2,0 -c 4 -r 96000 -t raw -f S32_LE | hexdump | more
Recording raw data 'stdin' : Signed 32 bit Little Endian, Rate 96000 Hz, Channels 4
HW Params of device "plughw:2,0":
--------------------
ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED MMAP_COMPLEX RW_INTERLEAVED RW_NONINTERLEAVED
FORMAT: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE MU_LAW A_LAW IMA_ADPCM S20_LE S20_BE U20_LE U20_BE S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE U18_3BE
SUBFORMAT: STD
SAMPLE_BITS: [4 64]
FRAME_BITS: [4 640000]
CHANNELS: [1 10000]
RATE: [4000 4294967295)
PERIOD_TIME: [125 743039)
PERIOD_SIZE: (0 3191328204)
PERIOD_BYTES: (0 4294967295)
PERIODS: (0 4294967295]
BUFFER_TIME: [1 4294967295]
BUFFER_SIZE: [1 4294967294]
BUFFER_BYTES: [1 4294967295]
TICK_TIME: ALL
--------------------
0000000 5600 0061 7900 1afb 0000 0000 0000 0000
0000010 1a00 0049 1c00 1b29 0000 0000 0000 0000
0000020 5300 004b e100 1b44 0000 0000 0000 0000
0000030 eb00 005b 5300 1b50 0000 0000 0000 0000
...
0000160 f300 fff5 f000 1071 0000 0000 0000 0000
I've tried both -D hw:2,0 and -D plughw:2,0 to no avail.
The CentOS works fine although the device is different:
arecord -l
output is
arecord --dump-hw-params -D plughw:1,0 -c 4 -r 96000 -t raw -f S32_LE | hexdump | more
Recording raw data 'stdin' : Signed 32 bit Little Endian, Rate 96000 Hz, Channels 4
HW Params of device "plughw:1,0":
--------------------
ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED MMAP_COMPLEX RW_INTERLEAVED RW_NONINTERLEAVED
FORMAT: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE MU_LAW A_LAW IMA_ADPCM S20_LE S20_BE U20_LE U20_BE S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE U18_3BE
SUBFORMAT: STD
SAMPLE_BITS: [4 64]
FRAME_BITS: [4 640000]
CHANNELS: [1 10000]
RATE: [4000 4294967295)
PERIOD_TIME: [125 743039)
PERIOD_SIZE: (0 3191328204)
PERIOD_BYTES: (0 4294967295)
PERIODS: (0 4294967295]
BUFFER_TIME: [1 4294967295]
BUFFER_SIZE: [1 4294967294]
BUFFER_BYTES: [1 4294967295]
TICK_TIME: ALL
--------------------
0000000 f800 005a eb00 1b39 6300 272a 2200 0274
0000010 bc00 0073 4500 1b4e 1400 2605 2900 0235
...
From what I can tell the only difference is the output: all zeros for the last two channels in the PopOS machine and content for the last two channels in the CentOS example. (The RPI and Ubuntu machine behaved the same as the PopOS device).
On a whim, I tried joining the audio group but it did not help.
Thoughts? any advice on what i can try to debug this further? Thanks!
Resolved! It turns out I needed to enable all the channels using AlsaMixer. The missing channels were enabled by using F4 for capture then selecting the channel and hitting the space bar.
You can have udev run a script to automatically enable capture on all inputs and set volume. https://gitlab.com/sbyrne/umc404hd-autocapture
I have raw AAC frames (variable size) and I want to stream them over RTP. I have their ADTS header.
header sample :
0xff 0xf9 0x5c 0x60 0x7 0x40 0x00
According to this the format is :
mpeg-2 (strange because I tell encoder to output mpeg-4) /
no crc /
AAC LC /
22050 Hz /
mono channel /
1 AAC frame
I tried to add this header (part 3) and this sdp :
v=0
o=- 0 0 IN IP6 ::1
s=No Name
c=IN IP6 ::1
t=0 0
a=tool:libavformat 55.7.100
m=audio 6000 RTP/AVP 14
a=rtpmap:14 MPA/22050/1
Without any success, ffmpeg keep telling "header missing", any help would be appreciated
I have created a asp.net application with framework 4.0.
It has a sort of interview screen with so many questions on it with the paging.
It may have 1000 pages with 10 questions in each page.
when users are using this application screen randomly gets frozen and asks for window credentials.
We also keep getting error for the same application in error log as below:
A process serving application pool 'appicationpoolname' suffered a
fatal communication error with the Windows Process Activation Service.
The process id was '4768'. The data field contains the error number.
Not sure if both above error are related or not.
I have created a rule in debugdiag tool for application pool crash and that has generated a dump file. The full call stack for the dump file is as below
Function Arg 1 Arg 2 Arg 3 Arg 4 Source
KERNELBASE!RaiseException+58 04242420 00000000 00000003 010ce504
clr!Debugger::SendRawEvent+9b 010ce530 0000002f 0000015c 000012a0
clr!Debugger::RaiseStartupNotification+48 6fa92811 00000001 01000000 00000000
clr!Debugger::Startup+73 6fa92bf9 00000001 01000000 00000000
clr!DoAdditionalPEChecks+e5 6fa92ac5 00000001 00000000 00000000
clr!EEStartupHelper+5f4 00000000 6fa92a9d 00000001 00000000
clr!EEStartup+52 00000000 6fa92a41 00000001 00000000
clr!EnsureEEStarted+c4 00000000 6fa92f9d 014bb2c0 00000000
clr!ClrCreateManagedInstance+41 708d4bb8 708d4ca8 010ceeb4 00000000
webengine4!LegacyActivationShim::ClrCreateManagedInstance+61 708d4bb8 708d4ca8 010ceeb4 00c6e268
webengine4!GetIsapiProcessHost+48 00c6e268 01c44e8c 6d8e0000 01c44e68
webengine!GetIsapiProcessHost+d0 00c6e268 01c44e8c 00b907d8 00000000
wbhst_pm+2e2a 01c4fed8 01c44e68 00000000 010cf56c
wbhst_pm+335f 00b907d8 01c4fed8 01c4fdf0 010cf5e4
wbhst_pm!GetProtocolManager+35 00b907d8 01c4fed8 00000000 00b90898
w3wphost!AppHostInitialize+235e 7534415b 00000000 00000000 00000000
w3wphost!AppHostInitialize+2698 010cf69c 708e199c 010cf618 00000001
w3wphost!IPM_MESSAGE_PIPE::operator=+1c03 010cf69c 708e199c 00000001 708f1274
iiscore!W3_SERVER::GetProtocolManagerCustomInterface+36 010cf69c 708e199c 00000001 708f1274
webengine4!InitClrHost+186 708f1274 00000000 014c8004 00000400
webengine4!CMgdEngGlobalModule::OnGlobalApplicationResolveModules+31 01c4efac 01c40330 010cf77c 7210a67a
iiscore!VIRTUAL_MODULE::GlobalDoWork+152 00000400 01c4efac 01c4efa8 01c4efa8
iiscore!W3_SERVER::GlobalNotify+98 00000400 01c4efac 00000000 72122f3a
iiscore!W3_APPLICATION::ResolveModules+22 014cc280 00000000 014cc284 00000001
iiscore!W3_APPLICATION::SetupNotificationContext+95 00000000 00000001 014cc284 014cc2e0
iiscore!W3_CONTEXT::SetupStateMachinePhase2+2ab 014cc280 014cc284 00000000 72103358
iiscore!W3_CONTEXT::SetupStateMachine+241 014cc284 014cc280 75341400 010cf894
iiscore!W3_MAIN_CONTEXT::StartNotificationLoop+3f 014cc284 00000000 00c712a8 014cb828
iiscore!W3_MAIN_CONTEXT::OnNewRequest+47 014cb828 014cb828 72a914e6 753413f0
w3dt!UL_NATIVE_REQUEST::DoStateProcess+26 753413f0 010cf8c0 72a9154c 00000444
w3dt!UL_NATIVE_REQUEST::DoWork+60 00000444 00000000 014cb82c 010cf8f8
w3dt!OverlappedCompletionRoutine+1a 00000000 00000444 014cb82c 00c712b0
w3tp!THREAD_POOL_DATA::ThreadPoolThread+89 00000000 00be7fd8 72cf0000 010cf924
w3tp!THREAD_POOL_DATA::ThreadPoolThread+24 00c712a8 00000000 00000000 00be7fd8
w3tp!THREAD_MANAGER::ThreadManagerThread+39 00be7fd8 010cf970 770f9ed2 00be7fd8
kernel32!BaseThreadInitThunk+12 00be7fd8 590a45de 00000000 00000000
ntdll!__RtlUserThreadStart+70 72cf1e5c 00be7fd8 ffffffff 771872ff
ntdll!_RtlUserThreadStart+1b 72cf1e5c 00be7fd8 00000000 00000000
Exception Information
In W3WP__~1.DMP the assembly instruction at KERNELBASE!RaiseException+58 in C:\Windows\SysWOW64\KERNELBASE.dll from Microsoft Corporation has caused an unknown exception (0x04242420) on thread 5
I am not sure how to use this to fix the issue. I tried using Winddbg with .loadby sos mscorwks
command but it says invalid module mscorwks
Any help would be appriciated.
Thanks,
MMC
Is this a first chance exception dump or a second chance exception dump ? When you created the rule in Debug Diagnostic tool, did you change something in the Unconfigured first chance exceptions section ?
Based on the stack it seems this is a first chance exception dump. Make sure that you change the Action time for un-configured first chance exceptions to NONE and then let the tool generate a second chance exception dump and that would be worth to look at.
If it generates one, analyze it using debugdiag and paste the stack and we can see why it is crashing