... | ... | @@ -11,8 +11,36 @@ |
|
|
|
|
|
## Intro
|
|
|
|
|
|
See [this amazing PDF](https://invent.kde.org/kde/kdenlive/uploads/fec036664d3c462ffaa6d664512551c1/Audio_guide_updated_Mar_06_2020_ver01.pdf) on #382.
|
|
|
This idea is about handling audio when there are not only stereo clips.
|
|
|
|
|
|
Inputs:
|
|
|
|
|
|
* [Channel Export Mapping in Audacity](https://manual.audacityteam.org/man/advanced_mixing_options.html) |
|
|
\ No newline at end of file |
|
|
* [In-depth introduction](https://invent.kde.org/kde/kdenlive/uploads/fec036664d3c462ffaa6d664512551c1/Audio_guide_updated_Mar_06_2020_ver01.pdf) on #382.
|
|
|
* [Channel Export Mapping in Audacity](https://manual.audacityteam.org/man/advanced_mixing_options.html)
|
|
|
|
|
|
|
|
|
## Additional notes
|
|
|
|
|
|
### Audio/Clip Basics
|
|
|
|
|
|
In the simple case (phone/camera recording), video clips have one stereo audio track. There are many more options however.
|
|
|
|
|
|
Technically, clips (video+audio like .mp4, or audio only like .wav) are primarily **containers** which contain encoded audio/video streams. The container describes what streams there are and in which format (and more). **Streams** can again contain channels. **Channels** represent a single (mono) waveform.
|
|
|
|
|
|
![image](uploads/79a760ee671fa9061b110d254996315a/image.png)
|
|
|
|
|
|
A video clip could now contain a video stream and two audio streams, one with stereo English language (i.e. 2 channels) and one with 5.1 Italian language (i.e. 6 channels). An audio clip from a field recording (with a multi-channel recorder) could contain 5 channels where CH1/CH2 are a stereo voice recording, CH3 is a sound effect mono channel, and CH4/CH5 are used for stereo environment recording. The channels can be combined in an arbitrary way in the input clip, but for editing they are used separately, for example the two voice channels only would be used on an audio track in the timeline.
|
|
|
|
|
|
```
|
|
|
INPUT ─────────────> TIMELINE ────────────> OUTPUT
|
|
|
|
|
|
CLIPS contain e.g. TRACKS to keep sound Video CONTAINER with
|
|
|
* Live Voice sources separated as Audio TRACKS, e.g.
|
|
|
* Environment long as possible (like - with and without voice
|
|
|
* Sound fx GIMP layers) - different languages
|
|
|
* Music containing CHANNELS
|
|
|
* Voiceover CHANNELS in track to achieve sound image, e.g.
|
|
|
(other lang) → achieve sound image - Stereo
|
|
|
TRACKS - 5.1 Surround
|
|
|
→ distinguish topics
|
|
|
``` |
|
|
\ No newline at end of file |