d-video | : movie_camera : 原生的VIdeo插件 | Video Utils library

I'm trying to use the Windows.Media.Playback MediaPlayer. I am attempting to follow the information here Play audio and video with MediaPlayer. I am able to hear the audio of a video by calling it from C#.

I added some controls like rewind or reload to the video on my page but I want these added controls to fade in/out like default controls of video by moving the mouse(fade in) and stop moving after 2sec(fade out).

I am trying to declare a ClientFunction on a Factory page and then call it on a test page. But I am doing something wrong and it doesn’t work. I have two pages one is factory page, second test page. In test page i have ClientFunction and it works fine. When i trying move to Factory Page it doesn't working.

im looking for this problem the last 2 days but didnt find any solution. I prepared this jsFiddle for you to show you my exact problem.

How do I make the image only visible for section 2? Like it should scroll behind the layer of section 1. It works from section 2 into section 3 but i cant find a solution to place it behind section 1.

JsFiddle Demo

I've got a moderately complicated AVAssetWriterInput setup that I'm using to be able to flip the camera while I'm recording. Basically run two sessions, when the user taps to flip the camera I disconnect session 1 from the output and attach session 2.

This works really great. I can export the video and it plays just fine.

Now that I'm trying to do more advanced stuff with the resulting video some problems are popping up, specifically the AVAssetTracks on the inside of the exported AVAsset are slightly mismatched (always by less than 1 frame). Specifically I'm trying to do this: https://www.raywenderlich.com/6236502-avfoundation-tutorial-adding-overlays-and-animations-to-videos but a significant amount of the time there ends up being an all black frame, sometimes at the head of the video, sometimes at the tail of the video, that appears for a split second. The time varies, but it's always less than a frame (see logs below, 1/30 or 0.033333333s)

I did a bit of back-and-forth debugging and I managed to record a video using my recorder that consistently produced a trailing black frame, BUT using the tutorial code I have not been able to create a video that produces a trailing black frame. I added some similar logging (to what's pasted below) to the tutorial code and I'm seeing deltas of no greater than 2/100ths of a second. So around 1/10th of 1 frame at most. It's even a perfect 0 on one occasion.

So my sense right now is that what's happening is I record my video, both assetInputs start to gobble data, and then when I say "stop" they stop. The video input stops with the last complete frame, and the audio input does similarly. But since the audio input is sampling at a much higher rate than the video they're not synced up perfectly and I end up with more audio than video. This isn't a problem until I compose an asset with the two tracks and then the composition engine thinks I mean "yes, actually use 100% of all the time for all tracks even if there is a mismatch" which results in the black screen.

(Edit: This is basically what's happening - https://blender.stackexchange.com/questions/6268/audio-track-and-video-track-are-not-the-same-length)

I think the correct solution is, instead of worrying about the composition construction and timing and making sure it's all right, just make the captured audio and video match up as nicely as possible. Ideally 0, but I'd be fine with anything around 1/10th of a frame.

So my question is: How do I make two AVAssetWriterInputs, one audio and one video, attached to a AVAssetWriter line up better? Is there a setting somewhere? Do I mess with the framerates? Should I just trim the exported asset to the length of the video track? Can I duplicate the last captured frame when I stop recording? Can I have it so that the inputs stop at different times - basically have the audio stop first and then wait for the video to 'catch up' and then stop the video? Something else? I'm at a loss for ideas here :|

MY LOGGING

Background: Could having audio as stream 0 and video as stream 1 explain why my MPG will play on OSX QuickTime Player, but not Win10 Movies & TV?
I've got an mpg file with audio as stream 0 and video as stream 1.
It plays fine under OSX QT Player, but not under Win10's default app.
For lack of a better idea, I'm assuming the unusual stream ordering is my problem, and I'm trying to fix it with ffmpeg. What luck! https://trac.ffmpeg.org/wiki/Map describes exactly my case!

Re-order streams

The order of your -map options determines the order of the streams in the output. In this example the input file has audio as stream #0 and video as stream #1 (which is possible but unusual). Example to re-position video so it is listed first, followed by the audio:

ffmpeg -i input.mp4 -map 0:v -map 0:a -c copy output.mp4

This example stream copies (re-mux) with -c copy to avoid re-encoding.

I use exactly that command, but the flipping doesn't seem to work, like so:

I followed the embedding tutorial in this page but the video in my iframe is not autoplaying. I have the exact parameters put up for autoplaying and looping, but for some reason its not doing it. Here is the code:

I am trying to autoplay a sound which would act as an app startup sound. Below is what I am using. Now when I add controls = TRUE, and click on play, the audio file plays fine, but when I set autoplay = TRUE, it doesn't play on its own. How can I fix this?

2021-03-06 17:56:41.069 2475-3124/com.example.app I/org.webrtc.Logging: EglRenderer: local_video_viewDropping frame - No surface

That's the error/warning I am experiencing. And the remote/local video track is not rendering in QBRTCSurfaceView.