Programmatically convert flv to mp4 on iOS - ios

Question

In our iOS app, we will receive flv**(Container)** file having video and audio streaming something like this
Input #0, flv, from 'test.flv':
Metadata:
streamName : flvLiveStream
encoder : Lavf55.12.100
Duration: 00:00:48.00, start: 66064.401000, bitrate: 632 kb/s
Stream #0:0, 41, 1/1000: **Video: h264 (Baseline)**, 1 reference frame, yuv420p(progressive, left), 1280x720, 0/1, 15 fps, 1k tbr, 1k tbn
Stream #0:1, 14, 1/1000: **Audio: pcm_alaw,** 8000 Hz, mono, s16, 64 kb/s
and this needs to be converted to mp4 container and format as well, I am trying using ffmpeg, I believe thats only the way , using transcoding.c file but failed at this stage
Impossible to convert between the formats supported by the filter 'in' and the filter 'auto_scaler_0'
I am trying to learn from OSX command like ffmpeg -I test.flv test.mp4 ,
is that feasible to port to iOS
will it work in all different scenarios,
In Summary
--- What is the best possible way to convert flv to mp4 on the iOS device
where video will be in h264 and audio will be in swf codec ?

Answer 1

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"MyVideo.mp4"];
NSURL *outputURL = [NSURL fileURLWithPath:filePath];
[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);
}];
}