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Questions tagged [audio]

Audio refers broadly to the information, be it acoustic or electronic, entering, traversing, or exiting some medium.

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27 views

Question about ffmpeg's overlay variable t

I've got an ffmpeg command that overlays a line on a video and moves it from left to right while the video plays: ffmpeg -i clip.mp4 -i line-with-transparent-white.png -filter_complex "[0:v][1:v]...
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33 views

FFmpeg: Align Video & Audio of Desktop Capture

I am using FFmpeg's built-in gdigrab & dshow to record the display & audio of my system. I am encoding to uncompressed H.264/AVC video & uncompressed PCM/WAV audio. I had been having two ...
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1answer
11 views

Frequency of Macbook fan sound

My macbook spins off the fan like crazy which is audible when I'm recording a video when I show some stuff in Photoshop for instance. I'm thinking I could try to filter it out in Premiere Pro with ...
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2answers
14 views

How to avoid audio border magnetics on Final Cut Pro X?

This might be an easy question, but I'm not able to find the answer. Sometimes the audio clip is slightly small than the video clip. I need to move the audio just a little bit (like less than 1 second)...
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7 views

Audio disappears partly after rendering VEGAS MS 15 Platinum

Having problems with Vegas MS 15 Platinum rendering- irrespective of the length of the project, the audio will disappear not completely after rendering, but about 30 min from the beginning of the ...
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1answer
15 views

Combine audio from one video file with video from another

I would like to combine high-resolution video in English with a foreign-language audio track from a low-resolution version of the same movie. What is good software (for Windows 7) to combine audio ...
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0answers
9 views

Audio Issues in HERO6 Protune Settings

GoPro Hero6 creates a separate .wav file along with the .mp4 video. But my .wav-s are all too silent I can barely hear them. As the excerpt from HERO6 manual shows, I followed the Protune instructions ...
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1answer
22 views

Surround sound for cinema feature film (Pricing of Dolby Surround)

We are planning to shoot our first feature film with a budget of around 100'000-2'000'000$. And we'd like to master it in 5.1 Surround sound. Normal procedure would be to do it with Dolby Surround, ...
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1answer
18 views

“Opus cuts audio above 20kHz” - Is this normal for lossey audio codecs?

Summary: 1. Is it normal among lossey codecs? 2. what are the effects of this specifically when handling this 'cutoff' audio file? 3. Why is it still saving the file as 48khz if it doesn't contain ...
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1answer
23 views

Adding a sine generated audio track to a video stream with ffmepg

I'm generating an MPEG transport stream from a PNG file with ffmpeg succesfully with the following command: ffmpeg -re -loop 1 -i smpte-color-bars-1080p.png -r 25 -vcodec libx264 -tune zerolatency -f ...
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2answers
41 views

Can anyone recommend a good/safe free spectrum visualizer? [closed]

Something that can generate fairly nice displays for videos would be good. Can just be the generic type where it displays differing frequencies as bars, but something nicer than the harsh ffmpeg ...
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1answer
31 views

MPEGTS & HLS: Only second segment onwards is valid

When i use hexadecagonal audio channel layout in an mpegts container, I can receive and play back the stream fine only if I configure the hls server to allow serving the very first segment, and then ...
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1answer
107 views

ffmpeg add audio to video not working in below command

in below command final video is created but sound of second video is muted after some time. here duration of audio and video is same. ffmpeg -y -i intro.mp4 -i videoaction.mp4 -i outro.mp4 -i audio1....
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1answer
7 views

Final Cut Pro X — Connect audio clip to another audio (not video)

I have a simple video with some background noises added and a background audio track. However, background audio track is too long, so I carefully cut it into multiple pieces and seamlessly mix: It ...
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1answer
20 views

Filter out calm parts of audio, let through really loud ones

I have a project where I have one video and two audio tracks. The first audio is from the line-in microphone, the second one is from the room environment. I only want the second audio to play when ...
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1answer
101 views

How to resolve ffmpeg error “input contains (near) nan/+-inf”?

I'm trying to convert some old WMVs into MP4s, but ffmpeg will not do it. I keep getting the following error: input contains (near) nan/+-inf audio encoding failed Exact command used is: ffmpeg -...
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21 views

Set audio channel title in a MOV file with ffmpeg

Today I received some materials in a MOV container. The MOV file is done pretty well and if you see in VLC they assigned also the channels names (channel title). This is something that I would like ...
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1answer
131 views

Long video ffmpeg transcode makes audio go out of sync

I have recorded a 50 minute video, edited it in Hitfilm Express to censor/blur people, and exported it in Hitfilm's high resolution format, generating an 80GB file. When I try to transcode this file ...
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1answer
20 views

What is the difference between audio Sampling rate and Frame rate?

I have a video file with audio. ffprobe reports two different numbers: Sampling rate and Frame rate. I understand the 48kHz rate--there are 48,000 audio samples every second. What is the other number, ...
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1answer
32 views

By how much can video and audio be out of sync?

If I have an interview or lecture style video and the audio is out of sync, by how much can it be out of sync before the average person would easily notice? I'm currently trying to create an HTML5 ...
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1answer
158 views

How can I force YouTube to convert my video's audio stream to Opus or Vorbis / Youtube Red issue

I know the answer, which is probably "there is no way", but bear with me for a moment. I am uploading videos to YouTube, and on my Android phone I am downloading them using YouTube Red. I am playing ...
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1answer
16 views

Too much bass in desktop sounds with a headset, but not during recording, only afterwards

I recorded some video footages with my voiceover, both with Fraps and OBS. (Also streamed with the latter) While I was playing everything was fine. (I played with a headset) When I played the videos ...
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1answer
43 views

Mixing audio with HDMI video to replace the sound from the camera

I would like to live-stream from a camera, but replace the audio from the camera with a higher-quality mixed soundtrack, ready for sending over HDMI to a transmission device. How can I do this? I ...
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1answer
333 views

Using ffmpeg to add height (as black bars) to video file without quality loss

I have a file of resolution 3840x1632, but my TV stretches the picture vertically to fill up all 2160 pixels of height. Is it possible to use ffmpeg to add blank / black height, while preserving the ...
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2answers
34 views

Decreasing levels of other channels when voice channel comes in

I'm recording commentary over a video, and when I'm talking in the commentary I'd like the other channel's audio to get quieter to compensate for my voice. If anyone is familiar with discord, I know ...
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2answers
416 views

What is KeyInt and min-keyint and no-scenecut

I am absolutely new to video processing, I am building a video streaming site and worked with ffmpeg to generate the formats I need for ShakaPackager. Sadly I don't understand some of the options ...
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2answers
28 views

How can I make videos like this? (mostly samples pitched into iconic pop or meme melodies)

Are there any explanations or tutorials? People don't seem to discuss how they're done in the comments at all and google doesn't help either. I looked up some sheet music and pitched and adapted the ...
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1answer
24 views

Audio level goes up and down in rendered output [After Effects]

I render my AE project using Media Encoder, but when I check the output, its audio level clearly changes and go up at some parts and down on other parts! and its not consistent at all. The thing is ...
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0answers
13 views

Video sound sounds like under rain when uploaded to Instagram

I edited a video in Davinci Resolve and exported it with no issue; sound and video are all good. But when I upload to Instagram, the sound is like under rain. Anyone experienced this before. Please ...
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0answers
23 views

Is it possible to cut video based on audio?

I wonder if any of you guys know some solution and can help a small team of inexprienced (in terms of video) podcasters. We're producing our Audio podcast in a purely audio editing software (Reaper) ...
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38 views

Rode NTG2 background noise

I bought an NTG2 as a run and gun solution with my C100 Mark 2 but have been having an issue with background noise/hiss. The following link illustrates the issue - you'll hear the noise in the ...
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2answers
4k views

Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly

I am using below command to push the video to Wowza server, since we are pushing raw h264 video, the rtp packet doesnot have the timestamp, and we could observe audio video sync issue while playing ...
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1answer
310 views

AAC with no global headers is currently not supported

As per ffmpeg bitstream filter documentation, if we use -bsf:a aac_adtstoasc then the AAC stream from a raw ADTS AAC or an MPEG-TS container to MP4A-LATM. https://ffmpeg.org/ffmpeg-bitstream-...
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0answers
67 views

Why does the volume of the audio significantly go down when converting AAC stereo to AAC mono using ffmpeg

I am attempting to convert a stereo, left-channel-audio-only AAC audio file into a mono AAC file using ffmpeg. When the conversion is complete, I see a significant drop in audio volume in the ...
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0answers
5 views

how do I fade audio with transition in iMovie?

New to iMovie and using transition Fade to Black. It seems natural to also fade the audio with this transition but I"m having to do it manually. Is there a way to not do this manually (ie, selecting ...
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1answer
47 views

Keeping sound from underlay video in creating PIP video with ffmpeg

I'm trying to make a video with an overlay video inside (PiP) but I can't get the sound source right, I need the sound from the underlay video but I keep getting the sound from the overlay video. I ...
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0answers
15 views

Certain audio clips stop working in playback and don't render but other tracks do

I'm using premiere pro CC 2018, I don't think it's a problem with the tracks since I've tried a lot of solutions and non have worked, sometimes all the audio plays smoothly in playback but when I ...
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25 views

Automatically detect “who is speaking” on an audio clip

Preface I'm a bit of a novice in video/audio production. I'm a software developer by trade, so I'm technical. I just may get some of the A/V lingo wrong. Goal I want to produce a video where the ...
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1answer
43 views

picking a frame and an overlapping audio from a video

I know how to extract frames and audio from a video using ffmpeg. But what I want to is, to pick a random frame in that video, and then picking a random 1 second audio clip that overlaps in time with ...
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1answer
22 views

Equivalent to audio samples in video

I wonder what's the smallest component of a video file. I know, in graphics, it's the pixel, in sound,, it's the sample. I also know video is made by frames + audio, so, is it pixels + samples?
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44 views

No sound in saved VLC stream

I'm tried to save stream using URL and it shows that there is audio track, but I don't hear anything. I used this: vlc your_input_file_or_stream_here --sout=file/ps:go.mpg Output of ffmprobe go.mpg:...
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1answer
460 views

FFMPEG - The result of converting video to hevc format lost audio (video only)

I'm new in programming, I have some movies and want to convert them to hevc format to reduce storage space but keep quality video, i tried with my code through ffmpeg: **for %b in (*.mp4) DO ffmpeg -...
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1answer
53 views

ffmpeg: How to avoid “start: 0.033333” when extraction audio from mp4

When extracting audio and video separately from a mp4 and recombining again ffmpeg -accurate_seek -ss 30 -t 10 -i input.mp4 -vn output-audio.mp4 ffmpeg -accurate_seek -ss 30 -t 10 -i input.mp4 -an ...
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0answers
41 views

Can Handbrake handle a demuxed audio track (.mka file)?

Or as it seems one has to always add some dummy video track for Handbrake to do the job in this situation? If so is there some other workaround to convert audio only files (e.g. bloated DTS to AAC)?
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31 views

FFMpeg: is it possible to apply filters while making video out of sequence of frames?

Here is the situation. These are operations I do: 1) My programs (on Android/Windows) produce sequence of frames of png-files which I convert into mp4-video using FFMPEG. 2) Fade-in and Fade-out video ...
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1answer
12 views

Getting audio components from two audio streams to remove noise

As a computer scientist, I know that it is possible to decompose two signal streams (such as audio) using the SVD (Singular Value Decomposition), to get the most natural bases for the signals. This ...
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0answers
110 views

how to combine .wav f32S audio with mkv h.264 video file (no audio)

Edits: I did: ffmpeg -i video.mkv -i sound.wav -vcodec libx264 -acodec copy output.mkv But then the sound was screwy as can be (like before), like radio walkie talkie. So then I assigned the channels:...
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0answers
26 views

Consumer grade vs professional audio

Newbie issue! I was given 12 miniDV tapes and the Canon ZR900 camera they were recorded on to transfer onto memory sticks. I used FW400 into a Dell XPS 9100 to capture using Filmora. No problems at ...
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1answer
51 views

how come my editor(vsdc editor) only has audio but not any video footage

My audio is great, but when I export the video it doesn't show-only a black screen. Any suggestions?
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1answer
33 views

Import secondary audio track along with video mpg into Adobe Premiere Pro

I've been trying for hours to import an mpg along with its secondary audio track into Adobe Premiere Pro. Only the primary track is imported. I know this mpg has two tracks because I can play the ...