Another potential caveat are file names with accentuated or special characters, which require to set a special codepage (but this is rare with english language file names). Quotation marks are required if there's at least one space in the file name or path name. The argument “%~nF” stands for the name of input file %F without its extension, so if an input file is called "dummy song name.mp3", the ouput will be called "dummy song name.mp4". Otherwise the complete path should be specified in the command itself, for instance : "C:\command line tools\ffmpeg\ffmpeg.exe". If there is an issue (with a standalone device which does not accept MP4 files with MP3 audio), then replace “-c:a copy” with “-c:a aac -b:a 192k” as suggested on the page linked above (which means : the audio stream will be re-encoded as AAC with an average bitrate of 192kbps).įor this to work, ffmpeg.exe should be in the same directory as the input files, or included in Windows PATH. It is preferable whenever possible to preserve the native stream as re-encoding always degrades the quality somewhat.
On the page linked above it is implied that MP3 is not supported by the MP4 container, but I've read on this forum that it was in fact supported, and, doing a quick test, it seems to work with no issue indeed. You can pass the -q option to dir2ogg (available in the repos as mentioned) which should do what you want.Code: FOR %F in (*.mp3) DO ffmpeg -loop 1 -i "black.png" -i "%F" -c:v libx264 -crf 20 -c:a copy -shortest "%~nF.mp4" Here I removed the “-framerate” option so it should produce a standard framerate (default is 25FPS apparently). If you do this MP3-to-OGG conversion, you can minimize the chance of artifacts (poor quality) by using a higher destination bitrate than the source bitrate, e.g if your MP3s are at 128 kbps, try using Ogg at -q7 (variable bitrate level 7), which is usually around ~200 kbps. Minimize the effect if you do so by choosing a higher destination bit-rate than the source bit-rate Hence, it isn't recommended to do such conversions unless absolutely necessary. When you encode (transcode) from one lossy format to another, most of those psychoacoustically redundant bits are already gone, so the transcoding quality will suffer and may even be "hearable" in the result. This means that they achieve their compression in great part by throwing away bits of audio information that are imperceptible to the human ear (called psychoacoustics )
Warning: Both MP3 and OGG are lossy formats, unlike say WAV or FLAC. to OGG because the result may sound poor! Be careful with conversions from MP3, M4A, etc.
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