a dream: video framerate presets for audio conversion

2012-04-20 19:10:16

Hi!

I registered into this forum just to make the humble request to put more focus on movie soundtrack transcoding regarding the future development of my favorite music player.

Program which focused on transcoding movie soundtracks, BeSweet is long ago out of development and it doesn’t run well anymore in Windows 7. It had nice and foolproof presets for stretching audio tracks to match video lengths caused by different frame rates. Mostly it is a matter of PAL speed-up, but there are other less common transcoding variations as well (like for example between 24fps and 23,679fps, which can also make a considerable difference in terms of audio/video mismatch). Unfortunately I couldn’t find any good alternative to BeSweet GUI.

Wouldn’t it be nice if such soundtrack transcoding presets as in BeSweet, were integrated into Foobar2000? One can quess that it could only make Foobar2000 even more popular.

I do almost all my audio converting with Foobar, as it supports so many different formats. To stretch the soundtracks I use Avidemux, but it is somewhat clumsy in terms of audio transcoding, there are only two frame rate possibilities: 25fps and 23,679, and it decodes only three external formats (AC3,MP3, WAV). Sometimes it cuts audio track shorter, if it’s a bit longer than video and still needs some delay fix.

in spe
henno

a dream: video framerate presets for audio conversion

Reply #1 – 2012-04-23 11:01:24

With foo_input_avs (Foobar Avisynth Decoder) I think you can use the following Avisynth scripts:

Code: [Select]

NicAc3Source("sample.ac3")

# SlowDown 24->23.976 #
SSRC(last, (AudioRate()*1001+500)/1000).AssumeSampleRate(AudioRate(last))

Code: [Select]

NicAc3Source("sample.ac3")

# SpeedUp 23.976->24 #
AssumeSampleRate(last, (AudioRate()*1001+500)/1000).SSRC(AudioRate(last))

I haven't fully tested it, so I'm not absolutely sure, but at least the amount of samples foobar reports correspond with the conversion.

a dream: video framerate presets for audio conversion

Reply #2 – 2012-04-23 11:14:53

or use pipe out to sox with appropriate command lines i assume, (/me would be interested in proper sox command lines for various cases as well).

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