![]() Like this thread is for Downmix 7.1 to 5.1 the method can be used also for that using the ffmpeg filter in 1): ![]() Remember ffmpeg start by track '0' then the eac3to track 3: is the map=0:2 for ffmpegĤ) 'Add to DEC' the ffmpeg filter included in the 'COMMAND LINE PARAMETERS'ĥ) Select the output format and bitrate/quality: AC3, EAC3, AAC (recommended for 2.0). You want change the EAC3 english track.ġ) Use the 'More parameters' -> F-FFMPEG -> Add or write directly in 'COMMAND LINE PARAMETERS' the ffmpeg audio filter:ģ) Select the track to modify. Sometimes eac3to can't decode the source track or you want preserve the pitch of the track (eac3to change the pitch when you change the audio duration). To change duration of audio tracks you can use UsEac3to and ffmpeg without eac3to. The standard way to mix 7.1 -> 5.1 is lower the volume of ALL channels to prevent clips and you have correct balance in all the movie but at half volume. Only in clip points the balance is lost and 'sur' (two speakers) can't produce the same volume than BL,BR,SL,SR (four speakers). Then most the time the volume in 'sur' is the same than in the 4 surround channels, and the global balance between front and surround is preserved. ![]() The mix is at full volume (1.0) and can produce clip if sum of volumes is greater than 1.0 (float samples are used at this point)Īnd apply a plugin (Audiolimiter.dll) to reduce volume only if clip is detected, to limit max volume at 1.0:Īnd finally return the 6 channels without changes in 'flr' Ive tried: ffmpeg -i input.mkv -vn -sn c:a copy output.dts Note switches -vn and -sn disable video and subtitle track copying respectively. Slr = Getchannel(a, 7, 8) # channels SL, SR Im trying to extract the DTS core from a DTS-HD MA track using ffmpeg running on a Linux dedicated server. Flr = Getchannel(a, 1, 2, 3, 4) # channels FL, FR, FC, LFEīlr = Getchannel(a, 5, 6) # channels BL, BR ![]()
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