Hi, sorry for the question... but Ive spent the last few days searching for a reply somewhere with no luck... That's the point: I am trying to encode a 3gp compliant file... compiled ffmpeg with amr support I run this command: ffmpeg -i source.mpg -acodec amr_nb-ar 8000 -ac 1 -ab 32 -vcodec h263 -s qcif -r 10 target.3gp it seems to encode correctly, but the file I get is not quite good as it should, for example: a) it crashes windows media player; b) it doesn't reproduce in 3G terminal (expecially NEC e606) while trying to check it out with mplayer under linux, that is what I see: *************************** Playing Ev.3gp. ISO: File Type Major Brand: 3GPP Profile 4 QuickTime/MOV file format detected. -------------- MOV track #0: 397 chunks, 397 samples MOV: Found unknown movie atom d263 (15)! Image size: 176 x 144 (24 bpp) Display size: 180 x 144 Fourcc: s263 Codec: 'h263' -------------- MOV track #1: 1976 chunks, 0 samples Audio bits: 8 chans: 1 rate: 8000 MOV: Found unknown audio atom damr (17)! Fourcc: samr -------------- MOV: longest streams: A: #1 (1976 samples) V: #0 (397 samples) VIDEO: [s263] 176x144 24bpp 10.000 fps 0.0 kbps ( 0.0 kbyte/s) ************************* Please, take a look at the audio part: 1976 chunks, 0 samples... isn't it strange? A valid 3gp file, for example, says: MOV track #1: 127 chunks, 127 samples Audio bits: 8 chans: 1 rate: 8000 MOV: Found unknown audio atom damr (17)! Fourcc: samr chunks and samples report the same numbers Could someone help me out? ffmpeg version 0.4.9-pre1, build 4754, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-vorbis --enable-faadbin --disable-faac --enable-xvid --enable-a52bin --disable-dts --enable-pp --enable-shared-pp --enable-amr_nb --enable-amr_nb-fixed --disable-sunmlib --enable-pthreads --enable-dc1394 --enable-gpl --disable-strip (Sorry, I know almost nothing specifically about audio/video ... :) Manuele