(Please note I've already looked at this other SO post.)
The Problem
I'm trying to convert an avi video to an mp4 so that I can play it natively on an iOS app using Objective-C
What I've Tried
I'm trying the following code to do that conversion:
- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetHighestQuality];
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
handler(exportSession);
}];
}
The error that is returned from the exportSession is Cannot Open
Extra Information
When I run the video that I'm trying to convert through Mediainfo I get the following for the video:
7 332kb/s, 1920*1080 (16:9), at 25.000 FPS, AVC (Baseline#L3.1) (CABAC / 1 Ref Frames)
And this for the audio:
128 kb/s, 8 000 Hz, 16 bits, 1 channel, PCM (Little / Signed)
I also used the exportPresetsCompatibleWithAsset: method on AVAssetExportSession and got the following results:
AVAssetExportPreset1920x1080,
AVAssetExportPresetLowQuality,
AVAssetExportPresetAppleM4A,
AVAssetExportPresetHEVCHighestQuality,
AVAssetExportPreset640x480,
AVAssetExportPreset3840x2160,
AVAssetExportPresetHEVC3840x2160,
AVAssetExportPresetHighestQuality,
AVAssetExportPreset1280x720,
AVAssetExportPresetMediumQuality,
AVAssetExportPreset960x540,
AVAssetExportPresetHEVC1920x1080
Another thing to note is that when playing with the preset and the output I managed to get an audio only file that was basically white noise. This was using the preset AVAssetExportPresetAppleM4A.
I hope that I've jotted down enough information.
Update
Using the comment by Ashley, i've created a function to return the export settings compatible with the asset.
- (void)determineCompatibleExportForAsset:(AVURLAsset *)asset completion:(void(^)(NSArray<ExportSettings *> *exports))handler {
NSArray<NSString *> *presets = #[
AVAssetExportPresetLowQuality,
AVAssetExportPresetMediumQuality,
AVAssetExportPresetHighestQuality,
AVAssetExportPresetHEVCHighestQuality,
AVAssetExportPreset640x480,
AVAssetExportPreset960x540,
AVAssetExportPreset1280x720,
AVAssetExportPreset1920x1080,
AVAssetExportPreset3840x2160,
AVAssetExportPresetHEVC1920x1080,
AVAssetExportPresetHEVC3840x2160,
AVAssetExportPresetAppleM4A,
AVAssetExportPresetPassthrough
];
NSArray<NSString *> *outputs = #[
AVFileTypeQuickTimeMovie,
AVFileTypeMPEG4,
AVFileTypeAppleM4V,
AVFileTypeAppleM4A,
AVFileType3GPP,
AVFileType3GPP2,
AVFileTypeCoreAudioFormat,
AVFileTypeWAVE,
AVFileTypeAIFF,
AVFileTypeAIFC,
AVFileTypeAMR,
AVFileTypeMPEGLayer3,
AVFileTypeSunAU,
AVFileTypeAC3,
AVFileTypeEnhancedAC3,
AVFileTypeJPEG,
AVFileTypeDNG,
AVFileTypeHEIC,
AVFileTypeAVCI,
AVFileTypeHEIF,
AVFileTypeTIFF
];
__block int counter = 0;
int totalCount = (int)presets.count * (int)outputs.count;
NSMutableArray<ExportSettings *> *exportSettingsArray = [#[] mutableCopy];
for (NSString *preset in presets) {
for (NSString *output in outputs) {
[AVAssetExportSession determineCompatibilityOfExportPreset:preset withAsset:asset outputFileType:output completionHandler:^(BOOL compatible) {
if (compatible) {
ExportSettings *exportSettings = [[ExportSettings alloc] initWithPreset:preset outputType:output];
[exportSettingsArray addObject:exportSettings];
}
counter++;
if (counter == totalCount) {
if (handler) {
handler([exportSettingsArray copy]);
}
}
}];
}
}
}
The results of this are as follows:
"Preset: AVAssetExportPresetAppleM4A Output: com.apple.m4a-audio",
"Preset: AVAssetExportPresetPassthrough Output: com.microsoft.waveform-audio",
"Preset: AVAssetExportPresetPassthrough Output: public.aifc-audio",
"Preset: AVAssetExportPresetPassthrough Output: public.aiff-audio",
"Preset: AVAssetExportPresetPassthrough Output: com.apple.coreaudio-format",
"Preset: AVAssetExportPresetPassthrough Output: com.apple.quicktime-movie"
From this I deduced that using the preset AVAssetExportPresetPassthrough and output type AVFileTypeQuickTimeMovie would be compatible.
However when running the following code: (i've tried .mp4, .mov and .qt for the file type)
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"MyVideo.mov"];
NSURL *outputURL = [NSURL fileURLWithPath:filePath];
NSURL *localURL = [NSBundle URLForResource:#"20180626_145233-v" withExtension:#"avi" subdirectory:nil inBundleWithURL:[NSBundle mainBundle].bundleURL];
[self convertVideoToLowQuailtyWithInputURL:localURL outputURL:outputURL handler:^(AVAssetExportSession *exportSession) {
switch ([exportSession status]) {
case AVAssetExportSessionStatusFailed:
NSLog(#"Export failed: %#", [exportSession error]);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(#"Export canceled");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(#"Successfully");
NSLog(#"OutputURL: %#", outputURL.absoluteString);
break;
default:
break;
}
}];
Which calls:
- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
handler(exportSession);
}];
}
I get this error:
Export failed: Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12842), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x60400024def0 {Error Domain=NSOSStatusErrorDomain Code=-12842 "(null)"}}
The reason you cannot open the file is because iOS does not support AVI files.
Here is the link to the Apple documentation on supported file types within AVFoundation.
Or this image for posterity should the values change:
Finally, you can just inspect the definition of AVFileType from within XCode to see this list for yourself.
For what it is worth, a cursory inspection on AVI via Google indicates that there are limitations with the AVI container that have been rectified in newer formats that are supported by iOS, so there is likely little incentive to add support at a later date.
While also a potential issue being that Microsoft created AVI, I cannot locate any restrictive licensing that would prohibit someone from using it, but IANAL.
You should use FFmpeg library for that kind of purposes.
Here is an open-source video-player based on FFmpeg: https://github.com/kolyvan/kxmovie
I don't know if this player still works for the latest iOS but in any case in source codes, you can discover many interesting things that can help you with your problem (such as how to use FFmpeg library).
Very easy to do with MobileFFMpeg
https://stackoverflow.com/a/59325680/1466453
Once you have MobileFFMpeg then make a call as follows:
[MobileFFMpeg execute:#"-i infile.avi youroutput.mp4"];
I have am iOS DVR application where i record and save video in .mp4 format in the document directory.
I am trying to move that video to camera roll but i am not able to move it.
I think it might be because of video format. Below is format of the video
H264 - MPEG-4 AVC
Resolution: 352 x 258
Frame rate: 15
I tried UISaveVideoAtPathToSavedPhotosAlbum but no luck.
I also tried to convert the video to another .mp4 using asset library using following code but status is always Failed.
[self convertVideoToLowQuailtyWithInputURL:localUrl outputURL:outputURL handler:^(AVAssetExportSession *exportSession)
{
if (exportSession.status == AVAssetExportSessionStatusCompleted) {
// Video conversation completed
}
}];
- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
handler(exportSession);
}];
}
How can I save recorded video file to camera roll ?
I have a problem tracing the underlying issue behind my asset export session failure. The issue is for one video only, and I believe the problem is in its audio track, since I successfully exported the asset without the audio track (only the video track).
The video track is decoded with AVAssetReader and the sample buffers are processed before being rewritten into a new video track; the audio track is passed with no decoding nor any intermediate processing. However, even without processing the video sample buffers, the same failure occurred.
I also tried doing it the other way round--with audio only and no video track--and still other videos worked just fine and this particular video failed. I suppose there's an inherent problem with the video's audio track, but I can't infer what the problem is, and hence I can't tackle it. Here's my code:
AVAssetExportSession* assetExport = [[AVAssetExportSession alloc] initWithAsset:composition
presetName:AVAssetExportPresetHighestQuality];
assetExport.outputFileType = #"com.apple.quicktime-movie";
assetExport.outputURL = [NSURL fileURLWithPath:path];
__weak typeof(self) weakSelf = self;
[assetExport exportAsynchronouslyWithCompletionHandler:^{
switch (assetExport.status) {
case AVAssetExportSessionStatusCompleted: NSLog(#"Asset combined");
break;
case AVAssetExportSessionStatusFailed: NSLog(#"Asset combination failed");
break;
default: NSLog(#"Asset combination completed with unknown status: %#", #(assetExport.status));
break;
}
}];
The problem is supposed to be in the asset export session; track insertion to the AVMutableComposition worked just fine. Here's the error message of the AVAssetExportSession:
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed"
UserInfo={NSUnderlyingError=0x6040001338d0 {Error Domain=NSOSStatusErrorDomain Code=-12780 "(null)"},
NSLocalizedFailureReason=An unknown error occurred (-12780), NSLocalizedDescription=The operation could not be completed}
I know this is an old question, but as it's not resolved, I will give the solution to error code 12780.
Most of the time the problem is the output URL.
Make sure that the URLis created like this:
URL(fileURLWithPath: "")
so for example:
let temp_output = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("temp_exported.mov")
Wild guess: the audio track was separated from its owning AVAsset, which then went out of scope. Try keeping a reference to the audio track's AVAsset until you call exportAsynchronouslyWithCompletionHandler.
I spent about two days with this issue...
I didn't figure out the root cause, however, I found setting a audioMix to AVAssetExportSession worked.
AVMutableAudioMix *videoAudioMixTools = [AVMutableAudioMix audioMix];
AVMutableAudioMixInputParameters *firstAudioParam = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:assetAudioTrack];
[firstAudioParam setVolumeRampFromStartVolume:1.0 toEndVolume:1.0 timeRange:CMTimeRangeMake(kCMTimeZero, CMTimeSubtract(endCropTime, startCropTime))];
[firstAudioParam setTrackID:compositionAudioTrack.trackID];
videoAudioMixTools.inputParameters = [NSArray arrayWithObject:firstAudioParam];
exportSession.audioMix = videoAudioMixTools;
It seems like that this forces to decode and re-encode audio track.
So I've been trying to use AVAssetExportSession to trim a square video. But for some reason I just keep getting this error:
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x1a03be70 {NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1a04c5e0 "The operation couldn’t be completed. (OSStatus error -12769.)", NSLocalizedFailureReason=An unknown error occurred (-12769)}
From Apple's website I found out that -11800 is an unknown error, but what about OSStatus error -12769? I searched everywhere on the internet and I had not seen any question/problem related to this error code. Please help. Thanks!
My code here:
AVAsset *asset = [[AVURLAsset alloc]initWithURL:self.originalVidUrl options:nil];
AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
if (clipVideoTrack.naturalSize.width==clipVideoTrack.naturalSize.height) {
NSLog(#"Square video");
NSArray *presets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
if ([presets containsObject:AVAssetExportPresetHighestQuality]) {
self.exportSession = [[AVAssetExportSession alloc]initWithAsset:asset presetName:AVAssetExportPresetHighestQuality];
self.exportSession.outputURL = [NSURL fileURLWithPath: self.tmpVidPath];
self.exportSession.outputFileType = AVFileTypeMPEG4;
CMTime start = ...
CMTime duration = ...
CMTimeRange range = CMTimeRangeMake(start, duration);
self.exportSession.timeRange = range;
[self.exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([self.exportSession status]) {
case AVAssetExportSessionStatusFailed:
NSLog(#"%#",self.exportSession.error);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(#"Export canceled");
break;
default:
NSLog(#"Export Success, File Saved.");
break;
}
}];
}
}
P.S. this code works for videos taken with the native camera app (i.e. non-square/non-processed videos).
I think I found the solution, but I have no idea why or how it worked.
Simply change the preset name from AVAssetExportPresetHighestQuality to AVAssetExportPreset1280x720, and you're good to go!
This question already has an answer here:
iPhone - Separating audio from a video file and saving it to a separate file
(1 answer)
Closed 9 years ago.
I managed it to download a youtube video using NSUrlConnection and save it to the device. Now I want to convert this (I guess .mp4) file to an .mp3 audio file. Does anyone know a solution for this problem? Maybe there's a way to only download the audio from the video? This would save a lot of time.
First of all, you don't want to convert anything, that's slow. Instead you want to extract the audio stream from the mp4 file. You can do this by creating an AVMutableComposition containing only the audio track of the original file and then exporting the composition with an AVAssetExportSession. This is currently m4a centric. If you want to handle both m4a and mp3 output, check the audio track type, make sure to set the right file extension and choose between AVFileTypeMPEGLayer3 or AVFileTypeAppleM4A in the export session.
NSURL* dstURL = [NSURL fileURLWithPath:dstPath];
[[NSFileManager defaultManager] removeItemAtURL:dstURL error:nil];
AVMutableComposition* newAudioAsset = [AVMutableComposition composition];
AVMutableCompositionTrack* dstCompositionTrack;
dstCompositionTrack = [newAudioAsset addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAsset* srcAsset = [AVURLAsset URLAssetWithURL:srcURL options:nil];
AVAssetTrack* srcTrack = [[srcAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
CMTimeRange timeRange = srcTrack.timeRange;
NSError* error;
if(NO == [dstCompositionTrack insertTimeRange:timeRange ofTrack:srcTrack atTime:kCMTimeZero error:&error]) {
NSLog(#"track insert failed: %#\n", error);
return;
}
AVAssetExportSession* exportSesh = [[AVAssetExportSession alloc] initWithAsset:newAudioAsset presetName:AVAssetExportPresetPassthrough];
exportSesh.outputFileType = AVFileTypeAppleM4A;
exportSesh.outputURL = dstURL;
[exportSesh exportAsynchronouslyWithCompletionHandler:^{
AVAssetExportSessionStatus status = exportSesh.status;
NSLog(#"exportAsynchronouslyWithCompletionHandler: %i\n", status);
if(AVAssetExportSessionStatusFailed == status) {
NSLog(#"FAILURE: %#\n", exportSesh.error);
} else if(AVAssetExportSessionStatusCompleted == status) {
NSLog(#"SUCCESS!\n");
}
}];