[vlc-devel] No dynamic aspect ratio change when transcoding

Bjørn Olav Ruud bjorn.ruud at gmail.com
Thu Jan 4 16:28:36 CET 2007

I had a previous post about problems with dynamic aspect ratio and
resolution changes in TS streams. The problem has now been isolated to
transcoding. It seems transcoding sets an initial aspect ratio and
ignores further changes. I have two MPEG-2 TS samples that demonstrate
this hosted here:

The file nrk1-169-43-169lowres.ts starts with 704x576 resolution
displayed in 16:9, changes to 4:3, and ends in 16:9 with 544x576
resolution. The first aspect change is ignored, the second corrupts
the image. I used the following commandline to produce a multicast
stream for testing:

cd vlc-0.8.6
vlc \
--color \
--extraintf logger \
-vvv \
--ttl 12 file:///home/bjorn/nrk1-169-43-169lowres.ts \
--sout '#transcode{vcodec=mp4v,vb=2000,deinterlace}:std{access=udp,mux=ts,url=}'
--udp-caching 10000 \

Am I doing something wrong, or is this a bug?

 -Bjorn Ruud

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