Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: ram@zedat.fu-berlin.de (Stefan Ram) Newsgroups: comp.os.linux.misc Subject: Re: fmpeg drift (2) Date: 16 Nov 2025 13:34:26 GMT Organization: Stefan Ram Lines: 33 Expires: 1 Jun 2026 11:59:58 GMT Message-ID: References: <10f34ng$1pnvq$1@dont-email.me> <10f5dib$2crs6$2@dont-email.me> <10f5e30$2d31u$1@dont-email.me> <8ruhulx88g.ln2@Telcontar.valinor> <69179e3a@news.ausics.net> <98lkulxo66.ln2@Telcontar.valinor> <89fnulx8b7.ln2@Telcontar.valinor> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: news.uni-berlin.de 5fvvlmB70FrPd+m2c1E4dQc6DFGEY0Wb04C+lNzKx41LrB Cancel-Lock: sha1:NCMjyQH9z1owbjQfScU5D0uzThE= sha256:7pzmcFeO/GfuxO3KLS/FRGJXlSWigoiHBiIzb4XJoTM= X-Copyright: (C) Copyright 2025 Stefan Ram. All rights reserved. Distribution through any means other than regular usenet channels is forbidden. It is forbidden to publish this article in the Web, to change URIs of this article into links, and to transfer the body without this notice, but quotations of parts in other Usenet posts are allowed. X-No-Archive: Yes Archive: no X-No-Archive-Readme: "X-No-Archive" is set, because this prevents some services to mirror the article in the web. But the article may be kept on a Usenet archive server with only NNTP access. X-No-Html: yes Content-Language: en Xref: csiph.com comp.os.linux.misc:77628 "Carlos E.R." wrote or quoted: >ffmpeg -i movie.mkv -vf "scale=-1:802,format=yuv420p" -map 0 >-c:v libx264 -preset fast -crf 22 -tune fastdecode -profile:v >main -c:a aac -b:a 192k -c:s copy -disposition:a:0 default >8c_movie.mkv . . . >[00007f0014f467d0] main decoder error: Codec `mp4a' (MPEG AAC >Audio) is not supported. <============ When the audio codec is not supported by the player, it might help to try a different codec. For a start, the following line should request no audio-transcod- ing at all: ffmpeg -i movie.mkv -map 0 -c:v libx264 -vf "scale=-1:802,format=yuv420p" -preset fast -crf 22 -tune fastdecode -profile:v main -c:a copy -c:s copy 8c_movie.mkv by "-c:a copy". Then, you could try to downmix the six channels to stereo if acceptable, replacing, "-c:a copy" with, |-c:a aac -b:a 192k -ac 2 , or you could try another audio encoding, replacing "-c:a copy" with, |-c:a ac3 -b:a 640k .