High-frequency Noise After Running Auto-Editor

[Cust0mfirmware]

Bug description

For the output files, the audio quality changes - also in places where no speed increase has been applied, high frequency noise ( short high-pitched noise that are not in the input file) can be heard.

What's your platform?

OS: Linux 5.15.0-117-generic x86_64
Python: 3.10.12
PyAV: 12.3.0
Auto-Editor: 24w31a

What command did you use

auto-editor file.mp4 --silent-speed 35 --video-speed 1

What properties does your input video have?

• recommendedTimebase: 30/1
• video:
  • track 0:
    • codec: h264
    • fps: 30
    • resolution: 1920x1080
    • aspect ratio: 16:9
    • pixel aspect ratio: 1
    • duration: 3.7
    • pix fmt: yuv420p
    • color range: 1 (tv)
    • color space: 1 (bt709)
    • color primaries: 1 (bt709)
    • color transfer: 1 (bt709)
    • timebase: 1/15360
    • bitrate: 173876
    • lang: und
• audio:
  • track 0:
    • codec: aac
    • samplerate: 48000
    • channels: 2
    • duration: 3.62
    • bitrate: 255682
    • lang: und
• container:
  • duration: 3.7
  • bitrate: 437351

Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.20.100
Duration: 00:00:03.77, start: 0.000000, bitrate: 429 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 173 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 255 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]

Comments

Many thanks for the great tool.

I would also have no problem to re-encode the video files before running auto-editor, if you can prevent the noise.

[Cfomodz]

The noise is caused by AAC re-encoding at moderate bitrate (255 kb/s). Use higher quality audio settings:

# Increase audio bitrate to 320k
auto-editor video.mp4 -b:a 320k