I'm trying to transcode a PAL resolution DVD into its original aspect MP4 equivalent. But when I do this, I get the following transpilation error: WARNING: Video aspect ratio is given as 720:576[1.25] but encoded as 1.333333:1[1.33]. This is Chameleon transcoder engine [184.108.40.206] (09/23/2013) LOG: [NEW SEGMENT] VOB:1 CELL:1 LOG: Video Start PTS = 5400 LOG: AudioA Start PTS = 5400 FFmpeg version from svn, Copyright (c) 2000-2008 Fabrice Bellard, et al. NOTICE: This app contains changes made by SlySoft Inc. in compliance with GPL. All changes are available as patches from http://oss.slysoft.com This file was digitally signed by SlySoft Inc. FFmpeg maintainers receive SlySoft products free of charge. If you're interested then please contact us at email@example.com Input #0, cham, from 'pipe:': Duration: N/A, start: 0.040000, bitrate: 9000 kb/s Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 9000 kb/s, 50 tbr, 90k tbn, 50 tbc [NULL @ 012d6bb0]Unknown option 'vb' [swscaler @ 010f0050]Unknown option 'vb' [libx264 @ 013340a0]using SAR=16/15 [libx264 @ 013340a0]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 [libx264 @ 013340a0]ratecontrol_init: can't open stats file [libx264 @ 013340a0]x264_encoder_open() revoked configuration Output #0, mp4, to 'Z:\Filme\xxxy Classics\Dirndlrock\Dirndlrock\Dirndlrock.mp4': Stream #0.0: Video: libx264, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=2-31, pass 1, 1215 kb/s, 90k tbn, 25 tbc Stream mapping: Stream #0.0 -> #0.0 Error while opening codec for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height LOG: SendPacket:#195 // V:26, A:15, S:0 // __ensure( WriteFile(PipeWrite, Frame.Data, Frame.Length, &Have, NULL) && Have == Frame.Length ) Why is this happening?