NextLevelSessionExporter | 🔄 Export and transcode media in Swift | iOS library
kandi X-RAY | NextLevelSessionExporter Summary
kandi X-RAY | NextLevelSessionExporter Summary
NextLevelSessionExporter is an export and transcode media library for iOS written in Swift. The library provides customizable audio and video encoding options unlike AVAssetExportSession and without having to learn the intricacies of AVFoundation. It was a port of SDAVAssetExportSession with inspiration from SCAssetExportSession – which are great obj-c alternatives. Need a different version of Swift?.
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Trending Discussions on NextLevelSessionExporter
QUESTION
I have a project where users can take a video and later add filters to them or change basic settings like brightness and contrast. To accomplish this, I use BBMetalImage, which basically returns the video in a MTKView (named a BBMetalView
in the project).
Everything works great - I can play the video, add filters and the desired effects, but there is no audio. I asked the author about this, who recommended using an AVPlayer
(or AVAudioPlayer
) for this. So I did. However, the video and audio are out of sync. Possibly because of different bitrates in the first place, and the author of the library also mentioned the frame rate can differ because of the filter process (the time this consumes is variable):
The render view FPS is not exactly the same to the actual rate. Because the video source output frame is processed by filters and the filter process time is variable.
First, I crop my video to the desired aspect ratio (4:5). I save this file (480x600) locally, using AVVideoProfileLevelH264HighAutoLevel
as AVVideoProfileLevelKey
. My audio configuration, using NextLevelSessionExporter, has the following setup: AVEncoderBitRateKey: 128000
, AVNumberOfChannelsKey: 2
, AVSampleRateKey: 44100
.
Then, the BBMetalImage library takes this saved audio file and provides a MTKView (BBMetalView) to display the video, allowing me to add filters and effects in real time. The setup kind of looks like this:
...ANSWER
Answered 2019-Oct-24 at 20:57Due to your circumstances, you seem to need to try 1 of 2 things:
1) Try and apply some sort of overlay that has the desired effect for your video. I could attempt something like this, but I have personally not done this.
2) This takes a little more time beforehand - in the sense that the program would have to take a few moments (depending on your filtering, time varies), to recreate a new video with the desired effects. You can try this out and see if it works for you.
I have made my own VideoCreator using some sourcecode from SO from somewhere.
QUESTION
I'm currently exporting a video in the following way:
...ANSWER
Answered 2019-Jun-04 at 17:54To reduce file size try these properties for setting up HEVC
codec (use cocoa pod NextLevelSessionExporter
):
QUESTION
I'm trying to render an image into a video captured with the front camera using AVMutableComposition. The size of the resulting video (including the image) is perfectly fine.
However, the initial video will be resized as shown in this picture:
I'm using the NextLevelSessionExporter and this is my code snippet:
...ANSWER
Answered 2018-Jun-14 at 05:15Try applying a negative scale transform to flip the video when mirrored:
QUESTION
ANSWER
Answered 2018-Jun-16 at 11:01There is an active bug that prevents you from exporting mirrored videos correctly. You need a few workarounds:
- Turn off the mirroring on the movieOutputFile
Manually flip the video horizontally when needed:
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