I build ffmpeg 3.1.1 for iOS (arm64 only, for iOS 8.0 target) and decoding it
with this alrorithm
- (NSArray *) decodeFrames: (CGFloat) minDuration
{
if(-1 == _videoStream &&
-1 == _audioStream)
return nil;
NSMutableArray *result = [NSMutableArray array];
AVPacket packet;
CGFloat decodedDuration = 0;
BOOL finished = NO;
while(!finished)
{
if(!_formatCtx)
break;
/*
* reads in a packet and stores it in the AVPacket struct
*/
if(0 > av_read_frame(_formatCtx, &packet))
{
_isEOF = YES;
break;
}
if(packet.stream_index ==_videoStream)
{
int pktSize = packet.size;
while(0 < pktSize)
{
int gotframe = 0;
/*
* Decode video frame
*/
int len = avcodec_decode_video2(_videoCodecCtx,
_videoFrame,
&gotframe,
&packet);
if(0 > len)
{
LoggerVideo(0, @"decode video error, skip packet");
break;
}
if(gotframe)
{
….
I only update the ffmpeg version and avcodec_decode_video2 takes double time
than 3.0 for 1920x1280 video.
Please let me know which things should I try.
Thanks.
> 2016. 7. 5., 오후 7:22, Carl Eugen Hoyos <[email protected]> 작성:
>
>> mpeg 3.0 but
>> lagging occurred when I updated it to 3.1.1.
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