Bug 457451

Summary:	Automatic transcoding of video files result in huge files
Product:	[Applications] kdenlive	Reporter:	Marc <marcwallington>
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED WORKSFORME
Severity:	critical	CC:	diekuhrannte, izbac
Priority:	NOR
Version First Reported In:	22.04.3
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Marc 2022-08-03 15:58:06 UTC

SUMMARY
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STEPS TO REPRODUCE
1. Add .mp4 video clips from any smartphone
2. Kdenlive will force you to transcode them, select highest quality (losless) transcoding
3. Kdenlive will create huge files for each clip

OBSERVED RESULT
Kdenlive forces the transcofing of .mp4 smarpthone videos (maybe other types of videos too, I've not tested other formats). Because you most likely want to work with the best possible quality, Kdenlive will generate really huge files. From a project of mine, I went from 4.5GB raw material to 90GB, this is not manageable.

EXPECTED RESULT
Kdenlive shouldn't force you to transcode anything, like it did in previous versions. Furthermore, if possible, the transcoding process shouldn't really generate a bigger file than the raw source material, where is that extra data coming from?

SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 izbac 2023-02-21 20:11:00 UTC

I have exactly the same problem!

Comment 2 diekuhrannte@web.de 2023-10-24 18:25:35 UTC

If you "select highest quality (losless) transcoding" then you will always get a comparatively huge size, that is normal.
Mobile videos often have a variable bitrate, no vidoe editor likes that, especially because then picture and sound are not always in sync.
If you only need the picture and not the sound, try not to encode. That would be a quick and easy way, though not ideal.
An alternative would be not to choose the best quality. 
Try it and report back.

Comment 3 Bug Janitor Service 2023-11-08 03:45:52 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Bug Janitor Service 2023-11-23 03:45:44 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!