Transcoding a WebM file (with VP8 video/Vorbis audio) to a MKV file (with H.264 video/unaltered Vorbis audio):įfmpeg -i someFile.webm -c:a copy -c:v libx264 outFile.mkv This can be achieved by specifying 'copy' as the audio codec. If the target container format supports the audio codec of the source file then consider just muxing it into the output file without re-encoding. This post on demonstrates what will happen if you re-encode a file 100 times: Copying audio tracks This quality degradation might not be audible to you but it might be audible to others. to the same or different lossy format might degrade the audio quality even if the bitrate stays the same (or higher). Transcoding from a lossy format like MP3, AAC, Vorbis, Opus, WMA, etc. Transcode to lossy from the lossless source (if you have it), or just copy the lossy source audio track instead of transcoding.Īnother option if you have a lossless source is to transcode it to another lossless codec, like flac or TrueHD (last one needs -strict -2). This guide is meant to help people new to encoding lossy audio to use the correct encoders and settings.Īvoid transcoding from a lossy format to the same or another lossy format when possible. Guidelines for high quality lossy audio encoding
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