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Topic: Problem with importing audio from Vimeo video to Audacity (Read 3835 times) previous topic - next topic
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Problem with importing audio from Vimeo video to Audacity

Here is the Vimeo video in question: https://vimeo.com/85927282
As the commenters note, it has been recorded way too quiet.

First: If I download the video through either https://en.savefrom.net or with Firefox extension FlashGot, then extract the audio with Pazera Free Audio Extractor, will the audio (an MP3 file extracted from an MP4 video) be untouched, lossless, the exact same if I streamed straight from Vimeo?

2 problems:

1. Sometimes the imported waveform looks and sounds empty in places, it has 'holes' in it.

2. Sometimes the MP3 is imported correctly (under identical circumstances, strangely), then I try either these two methods: http://www.thebest3d.com/audacity/tutorials/make-louder/audacity-tutorial-make-louder-more-volume-increased-amplitude.html
Amplify and Normalize, none of these seem to allow me to raise the volume levels loud enough to actually be able to hear the thing at normal levels.

Third, are there any methods to make the audio files louder that do it in a lossless fashion?

Re: Problem with importing audio from Vimeo video to Audacity

Reply #1 –
Quote from: encoder on
First: If I download the video through either https://en.savefrom.net or with Firefox extension FlashGot, then extract the audio with Pazera Free Audio Extractor, will the audio (an MP3 file extracted from an MP4 video) be untouched, lossless, the exact same if I streamed straight from Vimeo?
According to its documentation, Pazera can be used for both extracting and converting the audio. The video you linked has AAC audio, so if you end up with an MP3 file, you have probably converted it (meaning quality loss).

Quote from: encoder on
Third, are there any methods to make the audio files louder that do it in a lossless fashion?
As far as i know MP3GAIN/AACGAIN can change the volume losslessly.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #2 –
Downloaded the file from vimeo using youtube-dl,
Extracted the sound to wav (volume at +9dB) using Aura Video to Audio Converter,

Works easy and fast, no problem at all.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #3 –
Quote from: nastea on
Extracted the sound to wav (volume at +9dB) using Aura Video to Audio Converter,
Software and web site looks shady as hell.

Not to mention that you can instruct youtube-dl to extract just the audio.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #4 –
2 questions:

First) Do you use YouTube-DL from the command line, or through a GUI?

Here's cool GUI I'm satisfied with (sadly, it's a shareware, donationware, adware something): https://www.4kdownload.com/download though I have no idea if it is based on YouTube-DL or not

much more than with this, actually: https://mrs0m30n3.github.io/youtube-dl-gui/

An interesting problem with 4K Video Downloader is when trying to use the audio extractor option, it extracts a smaller audio file than the Pazera Extractor.

Second) Is http://aacgain.altosdesign.com/ fully inclusive of http://mp3gain.sourceforge.net/? AACGain is irreversible, while MP3Gain is reversible, but the MP3 function in AACGain, is it identical that of in MP3Gain? Oh, and what about .ogg, god forbid, .wav?

Do these have any other GUI than iTunes, like a simple GUI, similar to the ones in First)?

Re: Problem with importing audio from Vimeo video to Audacity

Reply #5 –
Most of the time you don't need any 3rd party software to get a media file from a page.
If right-click->save as doesn't work you can inspect the page (F12 in Firefox/Chrome) and search for .mp4 in the search box.
This is the link I got from that Vimeo page (for 720p) that you can then open and r-click save as:
https://03-lvl3-pdl.vimeocdn.com/01/2185/3/85927282/225164021.mp4?expires=1467461934&token=05ad5ffa5e44e0ddff668
(since it contains "expires" and "token" it might not work for you, but you'll find something similar)

Then once you've downloaded it there are many programs that can extract the audio losslessly. I use Xmedia Recode (which is basically a ffmpeg GUI).
I haven't checked, but the audio for this video is probably aac/m4a, so select that when you choose the destination format. Then just make sure you select copy in the audio tab, so there's no conversion.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #6 –
Thanks Brand for your input on downloading videos and extracting audios - the video download part was not new to me, Xmedia Recode software was, it is welcome, but this is the part of the process I can more or less confidently do.

The more interesting part is, however the last 2 paragraphs in my previous post, regarding increasing the volume in the audio:

Quote from: encoder on
Second) Is http://aacgain.altosdesign.com/ fully inclusive of http://mp3gain.sourceforge.net/? AACGain is irreversible, while MP3Gain is reversible, but the MP3 function in AACGain, is it identical that of in MP3Gain? Oh, and what about .ogg, god forbid, .wav?

Do these have any other GUI than iTunes, like a simple GUI, similar to the ones in First)?

Oh! Speaking of increasing the volume in the audio, the obvious question come to my mind: similarly, sometimes increasing the volume in the original video would be equally useful, I guess, that's the more difficult part.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #7 –
There's a small part in the audio that's a lot louder then the rest (with peaks at -2.3dB) That's probably why you didn't hear a big difference using Normalize in Audacity. Maybe you should use Hard Limiting. Does Audacity have that? (I use Cool Edit).
If you absolutely want lossless AACGain is probably the best choice.

Re: Problem with importing audio from Vimeo video to Audacity

Reply #8 –
Edited to add: the example video is just an example, I'm looking for a more general solution, something like this, really:

Quote from: encoder on
Second) Is http://aacgain.altosdesign.com/ fully inclusive of http://mp3gain.sourceforge.net/? AACGain is irreversible, while MP3Gain is reversible, but the MP3 function in AACGain, is it identical that of in MP3Gain? Oh, and what about .ogg, god forbid, .wav?

Do these have any other GUI than iTunes, like a simple GUI, similar to the ones in First)?

[First (reference): If I download the video through either https://en.savefrom.net or with Firefox extension FlashGot, then extract the audio with Pazera Free Audio Extractor, will the audio (an MP3 file extracted from an MP4 video) be untouched, lossless, the exact same if I streamed straight from Vimeo?]

Thanks!

Re: Problem with importing audio from Vimeo video to Audacity

Reply #9 –
Personally I preprocess audio for web with r128 + 6dB (So the AAC encoder gets leveled audio as input).

edit: The actual bash code
Code: [Select]
    read -r _ r128 _ <<< "$(ffmpeg -nostats -i "$1" -vn -filter_complex ebur128 -f null - 2>&1 | tail -10 | grep "I:")"
    correct=$(echo "(-23)-($r128)+6" | bc)
    echo "$correct"
p.s. Last time I checked vimeo, they transcode everything anyway, so not using some sort of replaygain on their side could be considered a bug (file a bug report ...).
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung