[BUG] Last frame of media source flashes before starting video playback

[guusguusguus]

Platform

Operating system and version: Windows 10, Pro 64-bit
OBS Studio version: 25.0.8

Expected Behavior

Play video starting with first frame

Current Behavior

First plays last frame and then starts playing from first frame

Steps to Reproduce

Add 'Media source'
Select a local video file (tested with quicktime and transparency and also h264 mp4) 
Configure playback with the following settings:
 [ ] loop
 [x]  restart playback when source becomes active
 [x] or [ ] use hardware enc..
 [ ] show noth...
 [x] or [ ] close file when in...

 Switch between scenes and the problem appears most of the time, problem is most consistent around lower framerates (25 fps) bu still noticeable around higher framerates (50 fps)

Additional information

I have a media source with a quicktime video with alpha enabled. When i start the scene with this media source it first shows the last frame of the video and then starts playing the video from the first frame. I have tested it with exporting the video with the last frame fully transparent and this solves the issue but it makes it impossible to end the video on the last frame.

i have also tested it without using transparency (a h264 mp4 file) and it has the same problem

problem persists on older versions (have tested it al the way back to version 16)

I have also been testing with framerates and the problem was most persistent with lower framerates (around 25 fps) and less persistent with higher framerates (around 50 fps) but the problem never really disappeared. the source material for the test was 25 fps

i started a post on the forum:
https://obsproject.com/forum/threads/last-frame-of-media-source-flashes-before-starting-video-playback.121882/

somebody confirms that the problem is also on the linux versions

i have been using the windows version (32 and 64 bit versions)

this is the output of the log file:

2020-05-10 00-55-14.txt

[RytoEX]

Please don't delete the issue template. Please edit your issue to use the template.

[therentabrain]

Workaround fwiw: I had this problem when going from one video file scene to another. I was able to avoid the flash by adding a full black screen jpg source under the first video. I also changed the first video from internal player to VLC. The second one is the internal player. I don't even remember what inspired this idea, or which one worked, but I hope something here helps.

[chamberlago]

I seem to be having this issue again with 26.1.1

[tdp4]

I can confirm this is also happening to me on 26.1.1.

[SimonGZ]

Noting that this continues to be a problem in OBS 27.2.1 on Mac. This old forum post does a really nice job of visualizing the issue: https://obsproject.com/forum/threads/media-source-rendering-the-last-frame-at-the-beginning.110180/

[therentabrain]

I don't even understand my own workaround above.
The one I use now is to put a very short black screen video file as the top item in the scene. When I switch to the scene, it plays the black frames on top and then that video stops, letting the thing underneath show through.

[DrewSunn]

Problem persists on 28.0.1

[tomica00]

Problem persists on 29.1.3
It's really annoying.