#11148: DirectShow (dshow) support lacking beyond device defaults
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Reporter: blurbdust | Owner: Diederick
| Niehorster
Type: defect | Status: open
Priority: normal | Component: avdevice
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by blurbdust):
> Raised to what? 32 bit or 24 bit?
32 bit as this is the maximum that I can find that is supported by
DirectShow for audio devices.
> Also, why would you need support for non-defaults? Would not it possibly
break the device? Is it possible that sample_size only allowed value is 16
since that is used to overwrite default of 24, while overwriting with 24
bit on unsupported devices can lead to defects?
My particular device is configurable to 16 bit, 24 bit, or 32 bit audio
capture. The default for DirectShow for my device is 16 bit 48kHz for
audio capture. The vendor created basically a DirectShow shim to their own
software for use with third-party software. I would strongly prefer to use
ffmpeg to not be locked into the vendor's software thus would like the
ability to configure the capture beyond the offered defaults. If I use an
older version of ffmpeg from before 2021-11-03, not only does the device
report support for > 16 bit within ffmpeg, if I add the small hack of `+
{ "sample_size", "set audio sample size", OFFSET(sample_size),
AV_OPT_TYPE_INT, {.i64 = 0}, 0, 32, DEC },` then configuration and capture
from the device works from ffmpeg.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11148#comment:4>
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