SoundHandler | Simple android library for playing looped music | Audio Utils library

I have a video with some background music in it.

I wish to add a piece of spoken dialogue at a particular location in the video, such that the background music is lowered for the entire duration of the dialogue audio.

I found a similar solution using sidechaincompress, which just works for mp3. I made some changes to it so that it includes the video too (-map 0:v). However, now the audio is cut short as soon as the dialogue ends.

I have a HEVC encoded 4k Video captured from a Reolink IP-Cam with VLC Player 3.0.14. I want to extract each frame of the video but the encoding stops after only two frames. This also happens when I try to convert into another video format. This happens on Windows and Ubuntu with different ffmpeg versions.

My command is:

After executing any ffmpeg command

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:

I would need to be able to seek to a position before playback of a video is started with JavaFx 16

When MediaPlayers seek() or setStartTime() is called before play() it is breaking video output and no frames are updated anymore (sound is still playing).

The duration of the video is known and not indefinite. No errors are printed by the listener nor any meaningful stalling (only sometimes in the beginning when video is loaded via https), but the same issue appears for local files as well. So I think this can be ruled out. I am building and running the app with Maven, mvn clean javafx:run.

I tried to call those methods separately and also one after each other inside the ready listener and outside in the start method.

I am using JDK 11 (11.0.11+9-Ubuntu-0ubuntu2), maven 3.6.3 and openjfx 16 at GNU/Linux (Ubuntu 21.04)).

I assembled a minimal example and do I do anything wrong in the following code? Do you know how this could be handled or worked around? Thanks in advance.

App.java

I have a video file in MP4 format which supposedly has a 720×576 resolution yet is 786 × 576 according to the Finder on Mac:

As part of this discussion here it's been pointed out to me that this may be because the file is PAL standard video, according to which this is the expected behaviour. I'd like to change this using ffmpeg so that the file actually is no longer PAL standard video but always only 720 pixels in width.

To do so, I've been pointed to this question to find the corresponding ffmpeg command. Yet when I try to run ffmpeg -i weird_video.mp4 -vf "scale=iw*sar:ih,setsar=1" -crf 28 -c:a aac -b:a 80k -ac 1 -movflags +faststart h-264-out.mp4, I get an error message as the actual width of the video seems to be 785 and not 786 pixels as indicated by finder:

I need to trim some clips in the video, the best way I found (without unpacking frames, or trimming only the keyframe, although with the ability to do so without transcoding) I do not quite understand the meaning of such setpts, and ffmpeg writes that there is something wrong with ',', but nevertheless it works.

Hello guys I am trying to create a web-dash manifest for VOD with ffmpeg, but I am getting this error Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted Error initializing output stream 0:2 -- while using vp9 codec and doesn't understand the error and how to resolve it. Can someone help me out? If I use vp8 instead of vp9 codec, I get the same error, but the ffmpeg log doesn't show any error.

I want to play a mp4 video on Debian 9.

First, I try to use ffplay to play the video. I use the command ffplay test.mp4, but it cannot play, and display many same errors Receive_frame and send_packet both returned EAGAIN, which is an API violation.. There are detailed logs.