I am trying to play two audio files pre_loop.flac and loop.flac using VLC from the command line, repeating the last item only (in an infinite loop).
Between the files, there should be no noticeable silence.
I have tried the following command:
cvlc pre_loop.flac loop.flac :repeat
This plays both files seamlessly but only once (neither repeating any item nor terminating the process).
I also cannot use two separate commands like
cvlc --play-and-exit pre_loop.flac && cvlc --repeat loop.flac
because the silence between the commands is too long.
Any suggestions?
Related
I was trying to make a music player for my game, however, when I was trying to get my sound to play it refused to work. The games output works before and after the sound, but I can't hear anything. I tried using both a folder and sound group (what I'm using currently) and both did not work. How would I fix this? I presume it has something to do with client-server but I am not sure.
local ss = game:WaitForChild("SoundService")
local rp = game:WaitForChild("ReplicatedStorage")
local list = ss.Music:GetChildren()
rp.SongOn.OnServerEvent:Connect(function(plr)
repeat
local num = math.random(1, #list)
print(num)
local track = list[num]
local name = track.Name
print(name)
plr.PlayerGui.Overhead.Notch.SongTitle.Text = track.Name
local song = ss.Music:WaitForChild(name)
print("played")
wait(track.TimeLength)
print("waited length")
until
rp.SongOff.OnServerEvent
end)
You never play anything. You don't actually reproduce the Sound. To run a Sound, use Sound:Play()
https://create.roblox.com/docs/reference/engine/classes/Sound
Your repeat until condition is also wrong. The music will not stop playing once that event is fired, and it will actually not matter at all - when the loop finishes running once, it will compare if literally rp.SongOff.OnServerEvent evaluates to true. OnServerEvent is the literal event itself, which will be true since it is not false or nil. So the loop will stop running when it runs once.
Instead, you likely want to make a function that plays the music, and run this function whenever:
Playing music is requested with the remote
The playing music naturally ends (https://create.roblox.com/docs/reference/engine/classes/Sound#Ended)
And then, bind to that stop music remote a function that stops the sound.
Also you should have some more shame, you didn't even try to hide you're making a nazi game
I am recording incoming stream to mp3 file into 20 seconds parts in sender device. After that i am uploading this files to Google Drive(using RCLONE). Then i am downloading this files to receiver device. I am waiting about a while time (buffering) in the receiver side. Then i start to play this file using VLC-player from command line and listening this song. Having a problem when skipping to another m3 file in media-player occurring an silence about 0.1 seconds. I tried to concatenate those mp3 files into one file, but same problem had occurred again.
How can i handle this problem ?
Here is the part of code;
def Sound(self):
t1=threading.Thread(target=self.read_playlist) # update playlist file continuously
t1.start()
vlc_instance = vlc.Instance()
player = vlc_instance.media_player_new()
i=0
while 1:
media = vlc_instance.media_new(self.playlist[i].strip())
player.set_media(media)
duration=self.len_mp3(self.playlist[i].strip())
player.play()
time.sleep(duration)
i=i+1
Mr. Brad, i am so late for feedback sorry about that. Problem solved with your advice, here what i do:
First i am creating an HLS segment with this command;
ffmpeg -f alsa -i plughw:1,0 -c:a libmp3lame -f segment -strftime 1 -segment_time 1 -segment_format mpegts path/%Y%m%d%H%M%S.ts
This creates a ".ts" files which is the length of 1 second according to timestamp
In the receiver side, i am downloading this ".ts" files to my device. While downloading these ".ts" files, i am waiting to create a ".m3u8" file for example let's say,
buffer time is 3 minutes, then i am starting the download process and waiting for 3 minutes to create ".m3u8" file.
After 3 minutes, i am starting to create ".m3u8" file manually and i am starting mpv-player(python interface) to play the ".m3u8" file. I am updating ".m3u8" file every one second in the receiver side
I am developing MIDI Player by referring to the following Web-Page.
http://twocentstudios.com/2017/02/20/bouncing-midi-to-audio-on-ios/
I don't do any recording, I just want to play the SMF file.
However, when I run setPreload (true), it says "ASSERTION FAILED: Preroll mode set during render" and my app hangs.
I searched for "Preroll mode set during render" but couldn't find any valid information.
Please help someone.
EDIT:
hi, #dspr.
The percussion sounds even if I don't do "AudioUnitSetProperty (kAUMIDISynthProperty_EnablePreload: 1)".
I think this is because the BANK for percussion is automatically assigned to ch.10.
However, in this state, the piano and guitar and others do not sound.
AVAudioUnitMIDI Instrument needs kAUMIDISynthProperty_EnablePreload to analyze which tone is assigned to which track in the SMF file, right?
Which method does AVAudioUnitMIDIInstrument use to preload SMF files?
(1) AudioUnitSetProperty (kAUMIDISynthProperty_EnablePreload: 1) to AVAudioUnitMIDISynth
(2) << How to preload? >>
(3) AudioUnitSetProperty (kAUMIDISynthProperty_EnablePreload: 0) to AVAudioUnitMIDISynth
(4) Start AVAudioSequencer
MIDI Player uses the kAUMIDISynthProperty_EnablePreload property of MIDISynth for that purpose. See the Apple comment about it below. Note the It should only be used prior to MIDI playback and must be set back to 0 before attempting to start playback sentence at the end :
/*!
#constant kAUMIDISynthProperty_EnablePreload
#discussion Scope: Global
Value Type: UInt32
Access: Write
Setting this property to 1 puts the MIDISynth in a mode where it will attempt to load
instruments from the bank or file when it receives a program change message. This
is used internally by the MusicSequence. It should only be used prior to MIDI playback,
and must be set back to 0 before attempting to start playback.
*/
EDIT : frankly, I'm a little bit reserved about your link
One strategy I haven’t tried would be to pitch shift the MIDI up one octave, play it back at 2x, record it at 88.2kHz, then downsample to 44.1kHz. AVAudioSession presumably can’t go past 48kHz though.
Clearly, the person who wrote that has a very poor knowledge about audio and sampling. Playing a MIDI song transposed one octave up at double tempo is really not equivalent than playing the same recorded in audio at double speed whatever you make the recording at 88.2kHz or any other sample rate. As a simple example, what happens is the file contains a drum set ? A snare drum (40) will become a Chinese cymbal (52) played two times slower ?
As I can understand this post, the described hack has for unique purpose to make recording. So if you simply want to play your MIDI file back you can certainly find a simpler and better example.
I am using AVAudioUnitSampler to play some midi sounds, i have a soundfont loaded and have sucessfully use start note, stop note and apply pitch bend midi commands. I am now trying to incorporate aftertouch or pressure commands as it is called in AVFoundation.
So my code looks roughly like this (simplified):
self.midiAudioUnitSampler.startNote(60, withVelocity: 60, onChannel: 0)
//some time later...
self.midiAudioUnitSampler.sendPressure(20, onChannel: 0)
The note is humming away but the send pressure commands seem to have no effect on the sound output. I have tried using send pressure and sendPressureForKey to and no luck.
What am i doing wrong or am I misunderstanding what sendPressure does? I expect it to change the volume of the note after it is played.
Btw i have a setup where the note is being played and i have a separate Control to fire pressureCommands into the samplee at some time after the note playback has been started.
My guess is that the sampler does not know what to do with aftertouch messages. If you want to change the volume of the note (and any other notes playing) you could send your value to parameter 7 (volume) instead:
self.midiAudioUnitSampler.sendController(7, withValue: 20, onChannel: 0)
From my experience I have the feeling that the sampler does responds to MIDI controller 7.
I did not found solution for one issue: how to play mp3 file from offset immideately?
I can only play file then send -(void)seekToTime: but in this case sound begins and interrupts then begins from defined offset.
I tried to apply seekToTime method on ASStatusChangedNotification (in different cases of AudioStreamerState) but there were without result.
upd: I think that may set time offset after the file began streaming (before playing). But how?
Thanks.
What I did was create a method to seek to the desired time that I run after [streamer start]:
while(streamer.bitRate == 0) {
sleep(1);
}
If you're concerned about waiting too long, you can add a time out: either a count of times through the loop, or set a start time and compare it to the current time to break out of the loop.
This blog post has another take:
http://www.saygoodnight.com/2009/08/streaming-audio-to-the-iphone-starting-at-an-offset/