Ticket #290 (closed defect: fixed)
alpha channel not preserved when transcoding
|Reported by:||matteosistisette||Owned by:||michael|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
When transcoding an flv file which has an alpha channel into a video or image file using codecs that support alpha channel (such as h264, or Apple Animation (qtrle), or PNG) the alpha channel is lost and the output video has an opaque background.
An example flv input file with transparency can be downloaded from http://totalwebvideo.com/pitchalt.flv
It has alpha channel. H264, Apple Animation and PNG all support alpha channel, so if any of these is used as the encoder and if the input video has alpha channel, the alpha channel should be preserved by default when transcoding.
- Priority changed from critical to normal
- Component changed from FFmpeg to undetermined
- Status changed from new to closed
- Resolution set to worksforme