Replace audio The -map option allows you to manually select streams / tracks. See FFmpeg Wiki: Map for more info. This example uses -c:v copy to stream copy (mux) the video. No re-encoding of the video occurs. Quality is preserved and the process is fast. If your input audio format is compatible with the output … Read more
If I’m not mistaken, the “ffmpeg wrapper” project you linked to is out of date and not maintained. ffmpeg is a very active project, lot’s of changes and releases all the time. You should look at the Xuggler project, this provides a Java API for what you want to do, and they have tight integration … Read more
I’ve been playing around with this for a few days. That “ffmpegprogress” thing helped, but it was very hard to get to work with my set up, and hard to read the code. In order to show the progress of ffmpeg you need to do the following: run the ffmpeg command from php without it … Read more
You probably do not have a keyframe at the 3 second mark. Because non-keyframes encode differences from other frames, they require all of the data starting with the previous keyframe. With the mp4 container it is possible to cut at a non-keyframe without re-encoding using an edit list. In other words, if the closest keyframe … Read more
Addition to @aalhanane and @Micheal Espinola Jr As m3u8x is only available for windows. Once you have identified the m3u8 url you can also use Jdownloader2 or VLC Media Player to download and concatenate the stream. Jdownloader2: Just copy the m3u8 url when it the Jdownloader is open. It will recognize the stream in Linkgrabber … Read more
See the Create a video slideshow from images – FFmpeg If your video does not show the frames correctly If you encounter problems, such as the first image is skipped or only shows for one frame, then use the fps video filter instead of -r for the output framerate Alternatively the format video filter can be added to the filter chain … Read more
To extract the audio stream without re-encoding: -vn is no video. -acodec copy says use the same audio stream that’s already in there. Read the output to see what codec it is, to set the right filename extension.
I ended up using mpg as the intermediate format and it worked (NOTE this is a dangerous example, -qscale 0 will re-encode the video…)
Well it’s all about time. FFMpeg uses in fact three different timestamps in different bases in order to work. tbn = the time base in AVStream that has come from the container tbc = the time base in AVCodecContext for the codec used for a particular stream tbr = tbr is guessed from the video stream and is … Read more
Is there any difference between M4A audio files and AAC audio files or are they exactly the same thing but with a different file extension?