CODEWITHSUNDEEP
android-mediacodecmp4parser
FuzzyAmi
FuzzyAmi

Reputation: 8147

What governs playback speed when encoding with Android's MediaCodec + mp4parser?

I'm trying to record, encode and finally create a short movie on Android (using API 16) with a combination of MediaCodec and Mp4Parser (to encapsulate into .mp4).

Everything is working just fine, except for the duration of the .mp4: its always 3 seconds long - and runs at about twice the 'right' speed.

I've tried to tweak every conceivable parameter - but nothing seems to make a difference - the film is always 3 seconds long - and always played way too fast.

So what governs the playback seepd? how do I generate a film with 'natuarl' speed?

Upvotes: 1

Views: 1152

Answers (1)

FuzzyAmi
FuzzyAmi

Reputation: 8147

I figured it out: When encapsulating with mp4parser (needed if you target API<18), you need to set the speed in mp4parser's API. The presentation time you provide to queueInputBuffer appearently make no difference if you're not using Android's built-in muxer (available only from API18).

I stumbled on this question on github, which indicates the following is required:

 new H264TrackImpl(new FileDataSourceImpl(rawDataFile), "eng", 100, 10);
  • the last two parameters (timeScale and frameTick) set the playback speed to 'noraml'.

Upvotes: 0

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