Concatenating Multiple Inputs
|
|
Problem
Given a list of input media files, the object is to concatenate them to
generate one contiguous output media file. The problem gets more
complicated if the input media contain data with different formats.
In such cases, we need to transcode them to matching formats before
performing the concatenation.
Solution
A sample application is written. It accepts a list of input
URL's. For each input URL, a Processor is created. Using the
TrackControls from these Processors, it finds the matching tracks
and performs the necessary transcoding if the tracks are not in
matching formats. A custom DataSource is then created to accept
the output DataSources from these Processors. It reads from the
DataSources and in turn generates a continuous stream of data. This
custom DataSource is then used to create another Processor to generate
the concatenated output stream. The output from this last Processor then
goes to a file DataSink to generate the final output data to a file.
Limitations
The track formats of the final output may differ from the original
input due to transcoding. For audio, downsampling may occur.
Only matching tracks can be concatenated. Tracks without matching
tracks will be disabled. e.g., Concatenating an audio only file with
an audio/video file will result in an audio only file.
As much as possible, the program attempts to maintain A/V synchronization
across the concatenated files. There are some cases while that fail.
|
|
| Requirements |
|
| Platform: |
JDK 1.1.6 or later |
| JMF API: |
2.0 or later |
| Implementation: |
AJ, WPP, SPP * |
* AJ = All Java, WPP = Windows Performance Pack, SPP =
Solaris Performance Pack |
|
Print-friendly Version
