MPlayer skipping audio often in certain videos. (Not all converted videos)

[StickyChannel92]

I used Handbrake to encode the video I want to PocketGo limitations. One video, the audio desyncs with video.

Steps to reproduce the problem or attempts to fix the problem:

• Playing the video
• Fast forwarding
• Downloading the original video and encoding it again
• Putting the original MP4 video on the PocketGo(?)
• Changing the framerate to match original video and the Sample Rate to whatever. (Handbrake)
• Changing quality to any number in Video tab. (Handbrake)

Affected Items
You're A Good Man, Charlie Brown (Laserdisc) from Archive.org converted into PocketGo format.

This is using the latest firmware on a PocketGo v1.

[Rezzy-dev]

Is it desynced from the start, and the time difference is kept the same, or does the time difference gradually increase as the video goes on?

See here on how to use the freely available tool, Avidemux, to fix a desynced audio track in a video:

https://www.simplehelp.net/2018/05/29/how-to-fix-out-of-sync-audio-video-in-an-mkv-mp4-or-avi/

This will work if the desync time difference is stable. If it's moving, then this is a problem with the original video file, or its re-encoding. You may need to use a different source video file or try a different encoding format.

[StickyChannel92]

This is a preview of what it sounds like on the PocketGo. Playing the exact same file on my computer has no issues; no audio delay, no unstable framerates.

Is there a fix? And if so, would the above link be a good method of solving this? I can't really figure out how to measure how many frames the audio is skipping. This is the only video I tested, so I didn't watch the other videos to find the problem yet. Some others play just fine (on the Pocketgo)

8mb.video-lt8-ZeabX0Lx.mp4

[Rezzy-dev]

Ah, the audio is running faster/normal, and the video is lagging behind. What resolution is the video?

The PocketGo doesn't have a lot of video power (no hardware acceleration, no dedicated graphics card). Make sure that the video is exactly (or close to) the 320x240 pixel resolution -- so that MPlayer doesn't need to waste resources scaling the video to fit the screen -- and pay attention to the video bitrate and framerate: keep them low.

That will give you the best possible performance on the device in terms of video playback.

[Rezzy-dev]

Try the following video encoding:

Encoding: MPEG-4
Resolution: 320x240 (240p)
Video Bitrate: 1024 (or less) kbps
Framerate: 20 fps

(Credit goes to @DoctorOey for finding the most optimal settings between video quality and performance.)

[StickyChannel92]

That actually worked. I had it as an MP4 file. It took longer to load, but as I started the video, the video runs at the correct speed. Thanks so much, and I will use this as a reference when watching videos on my PocketGo!

[Rezzy-dev]

I've just tested it, and @DoctorOey is right: the above encoding settings seem to be the most that the hardware can play smoothly, without video lag. If the video bitrate is pushed lower, you can get up to 30 FPS smoothly, but then the overall quality of the video suffers. So keeping it at 20 FPS and around 1 mbps (1000 kbps) bitrate seems to give the best result in most cases.

You can use VLC to create a conversion profile with these settings, and to easily convert videos you want to play on your Miyoo device in the future.

[Rezzy-dev]

When entering the video resolution in VLC, only enter in the width: 320px (or height: 240px). VLC will automatically calculate the rest for each video.

(Otherwise, if you enter both height and width, VLC may get confused and distort the newly created video's resolution.)