(Android) Kodi v21: Problems when fast forwarding and rewinding some MP4 videos (only multi part files)

[rainman74]

Bug report

Describe the bug

Here is a clear and concise description of what the problem is:

When playing some MP4 files, fast forwarding and rewinding is no longer possible. This affects on the one hand the playback of multiple part files via skipping and since one of the last nightly builds also single MP4 files. It is no longer possible to fast forward and rewind these files.

Expected Behavior

Here is a clear and concise description of what was expected to happen:

Fast forwarding, rewinding and skipping should be possible again with multiple parts MP4 files as it was with Nexus and the Omega alpha 1 build.

Actual Behavior

Problem 1:

• Skipping causes the playback to hang when reaching the end of a part file. Skipping back is generally no longer possible Then only stopping is possible.

Problem 2:
- Fast forwarding and rewinding is now often no longer possible even with single MP4 files, if you play with 2x, 4x, 8x, ... forward, then the video jumps back to the beginning or hangs when you click play again.

Possible Fix

To Reproduce

Steps to reproduce the behavior:

1. play mutliple MP4 part files and try to fast skip forth (video part1.mp4 -> video part2.mp4 -> video part3.mp4)
2. jump to the 2nd part and if than the player hangs, stop the video and start it again, so that it already starts at the 2nd part. Then try to fast skip back (video part2.mp4 -> video part1.mp4)
3. play a MP4 file and try to forward or rewind (2x, 4x, 8x, ...)

Debuglog

The debuglog can be found here:
kodi.log for problem 1:
https://drive.google.com/file/d/1MR_CmOHk7vyqCWiF3mFwJOnxS1betMbn/view?usp=sharing

Screenshots

Here are some links or screenshots to help explain the problem:

Additional context or screenshots (if appropriate)

Here is some additional context or explanation that might help:

The described problems do not occur with video files that are in an MKV container. I converted the same MP4 files to MKV files as a test and then the problems do not occur.

Your Environment

Used Operating system:

• Android

• iOS

• tvOS

• Linux

• macOS

• Windows

• Windows UWP

• Operating system version/name: Android TV 10

• Kodi version:
  kodi-20230824-b049c371-master-armeabi-v7a.apk

note: Once the issue is made we require you to update it with new information or Kodi versions should that be required.
Team Kodi will consider your problem report however, we will not make any promises the problem will be solved.

[thexai]

I can confirm similar issues with very common 1080p H265/x265 in MKV container too (MKV's created with MKVmerge).

In this case (MKV's) issues are not longer present reverting 535b0ea commit only.

I not use .MP4 files or multipart files, only regular MKV's.

Video freeze occurs in both Shield and Windows x64 after seek.

[popcornmix]

Video freeze occurs in both Shield and Windows x64 after seek.

@thexai just to confirm, you see an issue just with seeking (without ff/rew)?
Can you point to a sample file (e.g. big buck bunny) that you have seen issue with?

Seeking in mkv is working for me, for the mkv files I've tried. (LE build from kodi master on Pi4).

[thexai]

just to confirm, you see an issue just with seeking (without ff/rew)?

Yes

This is a 10 minutes fragment:
https://www.mediafire.com/file/178ze6qu4na6v5b/Sundown+(2021)-001.mkv/file

For some reason seems more hard to reproduce on short fragments. In original file seeks fails 80% of times in fragment only ~20%. An other way to reproduce is play until half, stop and resume from watched position, some times is obtained black screen others freeze, other works.

[thexai]

@rainman74
Can you test this build?

https://mirrors.kodi.tv/test-builds/android/arm/kodi-20230826-d2046537-revert-535b0ea-armeabi-v7a.apk

Has the commit 535b0ea reverted that for me fixes the issues in MVK's. It would be good to know if it also solves the problems in mp4.

[rainman74]

@rainman74 Can you test this build?

https://mirrors.kodi.tv/test-builds/android/arm/kodi-20230826-d2046537-revert-535b0ea-armeabi-v7a.apk

Has the commit 535b0ea reverted that for me fixes the issues in MVK's. It would be good to know if it also solves the problems in mp4.

With this test version at least fast forwarding and rewinding works again in MP4 files (solves problem 2), but jumping to the next or last part file via fast skipping still doesn't work.

[thexai]

Fast forwarding, rewinding, and seek should be fixed by #23709

If there is any multipart files specific issue left to resolve, please open a new issue with updated info.