```release-note:enhancement
resource/aws_elastic_transcoder_preset: Add plan time validations to `audio.audio_packing_mode`,  `audio.channels`,
`audio.codec`,`audio.sample_rate`, `audio_codec_options.bit_depth`, `audio_codec_options.bit_order`,
`audio_codec_options.profile`, `audio_codec_options.signed`, `audio_codec_options.signed`, 
`container`, `thumbnails.aspect_ratio`, `thumbnails.format`, `thumbnails.padding_policy`, `thumbnails.sizing_policy`,
`type`, `video.aspect_ratio`, `video.codec`, `video.display_aspect_ratio`, `video.fixed_gop`, `video.frame_rate`,   `video.max_frame_rate`,  `video.padding_policy`, `video.sizing_policy`, `video_watermarks.horizontal_align`, 
`video_watermarks.id`, `video_watermarks.sizing_policy`, `video_watermarks.target`, `video_watermarks.vertical_align`
```

```release-note:enhancement
resource/aws_elastic_transcoder_preset: Allow `audio.bit_rate` to be computed.
```

```release-note:bug
resource/aws_elastic_transcoder_preset: Allow `video_codec_options` to be empty.
```