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13c6252536
Same calculation as for RGBA etc to create unpremultiplied output. Useful for creating an intermediate "Mix/Effects bank", in vision mixer (switcher) terminology. Example command: ffmpeg -i input.mov -vf "[in]scale=iw:ih:interl=1,format=yuv420p[bg];movie=BBC_blocks_watermark.png,scale=iw:ih:interl=1,format=yuva420p[dog];movie=Kickabout_strap.mov,scale=iw:ih:interl=1,format=yuva420p[strap];[strap][dog]overlay=0:0[me1];[bg][me1]overlay=0:0,scale=0:0:interl=1[out]" -b:v 3M -an output.mov Fix trac ticket #549. Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory in git. You can also view it online at http://ffmpeg.org/documentation.html 2) Licensing ------------ * See the LICENSE file. 3) Build and Install -------------------- * See the INSTALL file.