mp4parser | A Java API to read , write and create MP4 files | REST library

This use case is a service that manually encodes a series of uncompressed .wav media segments into .m4s fragments for broadcast via MPEG-DASH, using ffmpeg to compress the .wav to .aac and sannies/mp4parser to assemble the aac audio into a .m4s media fragment.

I created this public GitHub project to reproduce the issue in its entirety.

For example, here's the custom ChunkFragmentM4sBuilder.java class.

This log is from ChunkFragmentM4sBuilderTest.java which results in the concatenated test output test-java-mp4parser.mp4 appears to be ok:

However, when I play the shipped playlist and segments using VLC, I see these failures in the logs:

This use case is a service that manually encodes a series of uncompressed .wav media segments into .m4s fragments for broadcast via MPEG-DASH, using ffmpeg to compress the .wav to .aac and sannies/mp4parser to assemble the aac audio into a .m4s media fragment.

I created this public GitHub project to reproduce the issue in its entirety.

For example, here's the custom ChunkFragmentM4sBuilder.java class.

The first example using MP4 box works, insofar as I am able to generate an initializing MP4 + series of fragment M4s files which can then be concatenated to form a playable MPEG4 stream.

Note: it's a requirement for this use case that each media segment is encoded from an individually generated source segment, versus using a tool such as MP4Box to stream from a continuous audio source.

Attempts to manually build media segments via mp4parser are still failing overall, because the fragments written by my ChunkFragmentM4sBuilder.java used below are malformed. But I'm having a difficult time understanding how exactly they are malformed.

It's been helpful for me to compare the two test logs side by side, ChunkFragmentM4sBuilderTest.log.txt and MP4BoxTest.log.txt.

The former log is from ChunkFragmentM4sBuilderTest.java which results in the concatenated test output test-java-mp4parser.mp4 which is in fact empty:

This use case is a service that manually encodes a series of uncompressed .wav media segments into .m4s fragments for broadcast via MPEG-DASH, using ffmpeg to compress the .wav to .aac and sannies/mp4parser to assemble the aac audio into an .m4s media fragment.

I created this public GitHub project to reproduce the issue in its entirety.

For example, here's the custom CustomFragmentMp4Builder.java class.

It's critical that we be able to designate this single .m4s fragment with a sequence number (index) that we will manually increment for each media segment.

The objective is to build an .m4s fragment comprising the box types SegmentTypeBox, SegmentIndexBox, and MovieFragmentBox. As For reference, I have used mp4parser to inspect an .m4s fragment that was generated via ffmpeg -f hls. This specification is available here as a .yaml file

My implementation creates an MP4 without error. But, when the unit test attempts to read the file that the ChunkMp4Builder just wrote to a temp folder:

We are integrating scoped storage in our app, we are reading and writing video files in sahred storage e.g Environment.DIRECTORY_MOVIES folder (shared storage movies directory) it is working as expected but we need to write custom metadata in video to do that we are using org.mp4parser:isoparser. To read and write metadata, this library needs file object before scoped storage we can get absolute path using Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES) now it's deprecated is there any other way to get the file path in scoped storage?

When I try to copy an mp4 from one folder to another inside one of the methods of Mp4Parse, everything works fine. When I tried to utilise one of the methods' outputs to make new objects and then use those in order to write the file in another folder, things didn't quite work out. Below is the code that I use:

I use this class to extract metadata and create videoFile objects with the corresponding data(The comments are leftover code I used to make sure it was working)

EDIT 1: After some testing I figured out that FOR SOME REASON, EVEN THOUGH temp from Mp4Parse.NoChunkMethod is NOT null or empty (I checked by printing all of its contents) the method returns a byte array of only 0s

I have been compressing Images without any problems. Recently my app required video compress functionality to be added. Again, Silicompressor does the job but for some reason there is no audio in output file.

I am using code inside Runnable

I am building a desktop application. I am using ProGuard with the following config:

I am trying to merge two videos(mp4 files), one with audio and one without audio, to a single video using MP4Parser. The final video that gets generated always has the audio from start. e.g. 1st video is of 20 sec length and has no audio. 2nd video is of 10 sec length and has audio. The final video generated is of 30 secs length but the audio will be played at the starting of the video for 10 secs (rest 20 secs won't have any audio), whereas it should have starting 20 seconds without audio and end 10 secs with audio.