AC3/DTS Talk Reply #25 – 2004-04-11 17:19:40 QuoteThat's expected. The VBR routine being employed by the test encoder I used just randomizes bitrates. So, some parts of that stream are being encoded at 32kbps.No, if I remember correctly I limited the min bitrate somewhere. Unfortunately I cannot look it up in the code, my PC is broken (some capicicators on the mainboard are broken). But remember that this patched DLL was created using the old ac3enc which created sometimes non-vaild bitstream anyway, so this doesn´t have to do something with VBR, but the noise you mean is yust artifacts, if it has 128kbps for 5.1, this sounds of course not very good. My VBR-Routine is not normal VBR or ABR, it´s RBR (Random Bitrate).QuoteIs there a way to convert the ac3 file to a (48kHz) wav file so i can try this anyway? I know this works - i have some 48kHz formatted wav files with ac3 content. Rather inefficient but playable on my system.Yes, that´s very simple: Install ac3filter and set output to S/PDIF. Open ac3 in GraphEdit (Graph should be: file.ac3 -> AC3 Parser -> AC3Filter -> Sound Renderer). Remove the Sound Renderer and add WAV Dest/File Writer. Press Play and you get a wav file with S/PDIF ac3 data inside. This wav file should be playable in all DirectShow-players, it has FormatTag 0x92. The FormatTag 0x92 will force the soundcard not to apply any change to the data and pass it directly through S/PDIF. But for what do you need that? This is only useable if you want to store 44100Hz AC3-content on a CD. The output played with this wav is exatly the same as if you directly play the ac3 with S/PDIF out.I also tested this VBR-AC3 on my receiver (Sherwood RD-6106R): No problem, plays prefectly with AC3Filter S/PDIF out. All software decoders except liba52-based and Moonlight Odio Dekoda failed on playing VBR-AC3.As I have already written in the original thread I don´t see anything in the ATSC A/52 Specs that disallows vbr-ac3, and it seems that the receivers can hadle it yust fine. But is it also allowed on DVD?