PCM (Pulse-code modulation) is a method used to represent digital samples of the analog signals.

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How accurate and reliable is loudness analysis (ebur128) in ffmpeg for PCM?

I need to test a lot of files on possible audio normalization issues, files can be of various containers and audio encoding formats but mostly PCM audio. I tried Rhozet QC solution but found it ...
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183 views

Is WAV (PCM) format bit rate is really CBR?

You know, all modern audio codecs bit rate modes are VBR, even if you restrict the settings to for example: MP3 128 CBR, the encoded result is between 120 to 135 ( a bit different with different ...
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250 views

How to extract Blu-ray audio without any conversion?

As avconv (forked from ffmpeg) said, the format of Blu-ray audio stream is called pcm_bluray, but why most of the tutorials say using -acodec pcm_s**le flag (** depends on its sample rate)? Are they ...
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952 views

Why Is Conversion From An MP3 To WAV (PCM) Lossless?

I understand that when converting between audio formats where no stream encoding is involved like when converting between WAV (PCM), AIFF, FLAC, ALAC, WMA Lossless, and etc, the process is usually ...
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Many microphones in windows

I need to record from as many as 40 microphones simultaneously on a single Windows 7 PC. These microphones will be present as USB audio adapters connected to powered USB hubs (so limited power isn't ...
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116 views

ffmpeg option, subchunk1size = 16

I have a wav file. How can I use ffmpeg with specific options to convert it to a wave file with subchunk1size = 16.
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166 views

How to stream desktop through audio jack (3.5) using dsp

Is it possible to stream my desktop over audio system? I mean some kind of cat /dev/fb0 > /dev/dsp? Or to pulse-code my desktop using built-in soundcard and to stream it over optical spdif audio-...
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How to convert PCM to MP3?

I have some .pcm files and I want to convert them to high quality .mp3 format. How can I do that? I've tried searching online but haven't found any programs that can do this. Ay suggestions? ...
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HDMI video stream

I am trying to determine the format of the audio portion of a video being sent from a digital device (DVD player, DVR, etc.) to a digital TV via an HDMI cable. My understanding is that the audio ...
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169 views

PCM Audio file and volume

I'm working with raw pcm files(with no headers) and I was wondering, does anyone know the calculation to find the current volume of a section of sound? I have all the information on the file, such as ...
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811 views

The audio of an FFmpeg converted mov file works in VLC but fails in Adobe Premiere cs5

I use this line to convert the mov file (Mark II 5D footage) to 720p: ffmpeg -i source.mov -s 1280x728 -vf crop=1280:720:0:0 -sameq -acodec copy dest_file.mov When I drag the result file to ...
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PCM sound level resets in Ubuntu 8.04

I am using Ubuntu 8.04 and seeing that PCM volume above 75% results in very poor sound quality. So, I brought it down. But the problem is, after every reboot it resets to 100%. How can I save the PCM ...
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Converting WAV to PCM

I have WAV files and need to convert them to PCM (44,1k, 16bit, Mono) format. How can I do this from the DOS console?
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Playing a PCM file on a UNIX system

I'm trying to figure out how to use libmad with C. The trouble is, libmad converts audio files to .pcm files and I'm unable to find a way to play these files. There is no straightforward .pcm player, ...