Bento4 | Full-featured MP4 format , MPEG DASH , HLS , CMAF SDK and tools

The AVQueuePlayer does not seek to the given time. Video always starts playing at the beginning. Using the default controls, I can seek manually to a desired point. I am using a m3u8 HLS stream.

When I build the Bento4 library from Android Studio, I get an undefined reference to 'AP4_Ac4SampleDescription::_class_AP4_Ac4SampleDescription' error.

Overall there are like 5 cmake commands for Bento4 for different platforms. Here are the 2 for Linux and Android:

Basic Linux: cmake -DCMAKE_BUILT_TYPE=Release ..

Android NDK: cmake -DCMAKE_TOOLCHAIN_FILE=$NDK/build/cmake/android.toolchain.cmake -DANDROID_ABI=$ABI -DANDROID_NATIVE_API_LEVEL=$MINSDKVERSION ..

It builds fine with the basic Linux version.

What might be the cause for the Android version not working? Please note: I tried a few different version of the Android NDK. I get the one error for versions 16 and 17, and another error for versions 18 through 21.

I need to create a Fragment-MP4 with "sidx" box to create a streamable and seekable video to use it by MediaSource API It is very easy to do it with Bento4 by using "--index" option, but I want to do it with ffmpeg because it has good other options like codec and bitrate and keyframes, It will be hard if I used both (ffmpeg, bento4) to create fmp4 by PHP exec

I need some help to understand the avcC atom structure of a particular mp4 sample I am trying to analyze.

Hex dump:

00 00 00 38 61 76 63 43 01 64 00 1F FF E1 00 1C 67 64 00 1F AC D9 80 50 05 BB 01 6A 02 02 02 80 00 00 03 00 80 00 00 1E 07 8C 18 CD 01 00 05 68 E9 7B 2C 8B FD F8 F8 00 00 00 00 13 63 6F 6C 72

This is what I understand from the above:

00 00 00 38 Size of avcC atom

61 76 63 43 avcC signature

01 configurationVersion

64 AVCProfileIndication

00 profile_compatibility

1F AVCLevelIndication

FF 111111b + lengthSizeMinusOne

E1 111b + numOfSequenceParameterSets (in this case, 1 SPS)

00 1C SPS length (in this case, 28 bytes)

67 64 00 1F AC D9 80 50 05 BB 01 6A 02 02 02 80 00 00 03 00 80 00 00 1E 07 8C 18 CD SPS data (28 bytes as per above)

01 numOfPictureParameterSets (in this case, 1 PPS)

00 05 PPS length

This is where the problem begins. Based on the PPS length given by the previous bytes, the next 5 bytes should be the PPS data: 68 E9 7B 2C 8B

However according to the avcC header, the total length of the atom is 56 bytes (0x38), which means that the following 4 bytes should be included: FD F8 F8 00

But the problem is that the PPS length is given as 5 bytes (0x05). So what exactly are these final 4 bytes?

Then follows the header of the colr atom:

00 00 00 13 size of colr atom

63 6F 6C 72 colr signature

Which I have checked and is indeed 19 bytes in length (0x13).

The problem is with the avcC atom and with that particular mp4 sample I am analyzing (I've checked other samples too and they didn't have this peculiarity).

You can find the sample here.

EDIT

mp4info tool from the bento4 suite reports the following as the avcC atom's size: 8+48

And mp4dump reports:

I am trying to convert an MP3 file to a fragmented MP4 like this:

How to merge a video and an image (or a black overlay) to get the video on top?

Input video is already prepared for this (its maximum width/height is 1920x1080) and needs to stay at original size.

This is how it should look like:

orange is an overlay/image (1920x1080px), pink is a video on top of it (and centered)

The best shot so far I've got: