Encoding to MPEG-4(divx) in constant quality mode ignores Output quality settings #61708

New Issue

Eduardo Guerras · 2019-02-19T11:44:43+01:00

Eduardo Guerras commented

2019-02-19 11:44:43 +01:00

System Information
Operating system: Debian 9
Graphics card: Intel integrated GPU

Blender Version
Broken: 2.79b release
(example: 2.79b release)
(example: 2.80, edbf15d3c0, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
Encoding to MPEG-4(divx) ignores 'Output quality' settings like, e.g. Perceptually lossless, Medium quality and such. Only 'None, use constant bitrate' works.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Load default startup
Switch to the VSE
Import any video strip with high quality 1080p footage.
Switch to properties tabs
Unfold 'Encoding'
Choose:

Container: Matroska
Codec: MPEG-4(divx)
Output quality: Perceptually lossless.

Hit Ctrl+F12 or choose menu option Render > Render animation
Watch how the results are ugly and low bitrate.
Repeat steps 6 to 9 with different options of Output quality such as 'Very low quality' and 'High quality' and see how the output video files are identical.

The only way to change the output quality is choosing 'None, use constant bitrate' which defeats the purpose of encoding with constant quality quantifier altogether.

**System Information** Operating system: Debian 9 Graphics card: Intel integrated GPU **Blender Version** Broken: 2.79b release (example: 2.79b release) (example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen) Worked: (optional) **Short description of error** Encoding to MPEG-4(divx) ignores 'Output quality' settings like, e.g. Perceptually lossless, Medium quality and such. Only 'None, use constant bitrate' works. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). 1. Load default startup 2. Switch to the VSE 3. Import any video strip with high quality 1080p footage. 4. Switch to properties tabs 5. Unfold 'Encoding' 6. Choose: ``` Container: Matroska Codec: MPEG-4(divx) Output quality: Perceptually lossless. ``` 7. Hit Ctrl+F12 or choose menu option Render > Render animation 8. Watch how the results are ugly and low bitrate. 9. Repeat steps 6 to 9 with different options of Output quality such as 'Very low quality' and 'High quality' and see how the output video files are identical. The only way to change the output quality is choosing 'None, use constant bitrate' which defeats the purpose of encoding with constant quality quantifier altogether.

Eduardo Guerras commented

2019-02-19 11:44:43 +01:00

Added subscriber: @eguerras-2

Richard Antalik commented

2019-02-19 16:56:36 +01:00

Added subscriber: @iss

Richard Antalik commented

2019-02-19 16:56:36 +01:00

Applies to all renders, not only movies imported in VSE

ChristopherAnderssarian commented

2019-02-20 11:04:52 +01:00

Added subscribers: @dr.sybren, @ChristopherAnderssarian

ChristopherAnderssarian commented

2019-02-20 11:04:52 +01:00

Something for @dr.sybren?

Sybren A. Stüvel commented

2019-02-20 12:31:39 +01:00

According to the FFmpeg documentation DivX doesn't support the crf parameter we're using. Instead, it'll have to use the qscale parameter.

This issue is similar to #60911 in the sense that the mapping from quality setting in Blender to parameters for FFmpeg need to become codec-aware.

According to the [FFmpeg documentation](https://trac.ffmpeg.org/wiki/Encode/MPEG-4) DivX doesn't support the `crf` parameter we're using. Instead, it'll have to use the `qscale` parameter. This issue is similar to #60911 in the sense that the mapping from quality setting in Blender to parameters for FFmpeg need to become codec-aware.

Philipp Oeser removed the

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Encoding to MPEG-4(divx) in constant quality mode ignores Output quality settings #61708