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Topic: Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?) (Read 2401 times) previous topic - next topic
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Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?)

In need for a "placeholder" for missing tracks without audio, to keep metadata. Need to be able to create empty container file for metadata only. If that is technically invalid in the format in question, a good second would be if fb2k can read and tag it.

Any tool to quickly generate one and copy metadata? Seems that ffmpeg isn't happy about filling a file with nothing but metadata, but I was able to make zero-length speex-in-.ogg (and as .spx) and have fb2k read it.


If it matters, one can assume there is embedded art present (some formats may take that as a "video codec" in case they don't accept empty containers).

Re: Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?)

Reply #2 –
This creates 0-samples flac with tags from the input:
Code: [Select]
sox input.flac output.flac trim
Works for ogg vorbis too.

Re: Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?)

Reply #3 –
Nice. I have a 2 second empty wav file, which I use just for that purpose, to be a placeholder.
I don't have much need for it, but it sits in the root of my library just in case.
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Re: Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?)

Reply #4 –
Quote from: danadam on
This creates 0-samples flac with tags from the input:
Code: [Select]
sox input.flac output.flac trim
Works for ogg vorbis too.

Interesting. foobar2000 claims nonsense granule (maybe I should have updated my sox) ... I managed to get ffmpeg create zero-length .ogg files too, which fb2k is happy about.
sox generates aiff that fb2k is happy about, but I have not succeeded at doing it with .wav.

Attached a few empty files - and one with a single sample, if that is interesting  :))
 

Re: Create "empty" (ogg / matroska / ?) container, how? ( / .wav, even ?)

Reply #5 –
Any .mka file can effectively be truncated into nanosecond length if you create one chapter mark inside with that length.