Clips rendered in proxy quality

Bug
1

UPDATE
As soon as I have the opportunity to repeat the issue, I’ll delete this line and correct this report in case of necessity.

What is your operating system?
Operating System: Manjaro Linux 21.2.0
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2
Kernel Version: 5.14.18-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 5500 XT

What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
21.10.31 (x64)

Can you repeat the problem? If so, what are the steps?
Drag 4K clips in the timeline
Export video
Resolution is 3840x2160, but clips are rendered in 960x540 (proxy @540p selected), titles are not affected

Notice: Preview scaling not active

Excerpt from MLT file:

<chain id="chain219" out="00:01:55.856">
    <property name="length">00:01:55.872</property>
    <property name="eof">pause</property>
    <property name="resource">proxies/[HASH].mp4</property>
    <property name="mlt_service">avformat-novalidate</property>
    <property name="seekable">1</property>
    <property name="audio_index">1</property>
    <property name="video_index">0</property>
    <property name="mute_on_pause">0</property>
    <property name="shotcut:hash">082c7cc056a42f5e95913022b082cd3c</property>
    <property name="shotcut:caption">[CLIP NAME].MP4</property>
    <property name="xml">was here</property>
</chain>

It should be instead:

<chain id="chain219" out="00:01:55.856">
    <property name="length">00:01:55.872</property>
    <property name="eof">pause</property>
    <property name="resource">[CLIP NAME].MP4</property>
    <property name="mlt_service">avformat-novalidate</property>
    <property name="seekable">1</property>
    <property name="audio_index">1</property>
    <property name="video_index">0</property>
    <property name="mute_on_pause">0</property>
    <property name="shotcut:hash">082c7cc056a42f5e95913022b082cd3c</property>
    <property name="shotcut:caption">[CLIP NAME].MP4</property>
    <property name="xml">was here</property>
</chain>
2

Sorry but I do not reproduce the problem.

Did you turn on Export > Advanced > Use preview scaling?

Also, front the template:

Can you repeat the problem?

That means, can you repeat the problem from a new project? If your project was corrupted somehow and saved with proxies, your XML is missing important information (path and file name in a property named “shotcut:resource”) to restore the project. How it got there then is the big question.

Also, where did you get your build of Shotcut? In what package format?

3

That’s really interesting, I couldn’t reproduce the issue either.

Also, where did you get your build of Shotcut? In what package format?

I downloaded it – better, updated – from the official Manjaro repository.
As far as I remember, Shotcut crashed a couple of times during editing.
I was working on a pretty complex 30-min video with an additional audio track and lots of overlays (mostly text captions, but also some more in PNG format as well as a couple of overlay sub video animations with alpha mask).

4

Not supported here by the developers.

5

For Linux, I recommend the Linux portable package from the official download site:
https://shotcut.org/download/

The packages from the Shotcut site have been specially tested with the included dependencies to ensure the best experience.

6

Dear Shotcut team, since the last time I’ve been using the same version installed from the AppImage package.
It happened again. I was working on a less complex project (exported video length 38 mins), Shotcut crashed a couple of times.
While doing some minor corrections in the project file, I accidentally discovered

<property name="resource">proxies/[HASH].mp4</property>

instead of

<property name="resource">[CLIP NAME].MP4</property>

Not sure when it happened, if I confirmed an automatic restore or not. It’s a matter of fact that I got the program working in a much more reliable way after a system restart.