Opened 5 years ago
Last modified 22 months ago
#7004 open defect
Documentation: please clarify jpeg2000 encoding quality range
| Reported by: | cri | Owned by: | |
|---|---|---|---|
| Priority: | minor | Component: | documentation |
| Version: | git-master | Keywords: | j2k |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
The ffmpeg-all man page says, about the jpeg2000 encoder:
the "-q:v" option can be used to set the encoding quality
In the JPG standard, the quality parameter has a 1-100 range (100 being the best), while the "-q:v" option works the opposite way: 1 is the best (I don't know the highest value).
Please specify the supported range in the documentation, and clarify that lower value = better quality.
Change History (2)
comment:1 by , 5 years ago
| Keywords: | j2k added |
|---|---|
| Priority: | normal → minor |
| Status: | new → open |
| Version: | unspecified → git-master |
comment:2 by , 22 months ago
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Also, should not .i64 = 1 be here?
https://github.com/FFmpeg/FFmpeg/blob/069d2b4a50a6eb2f925f36884e6b9bd9a1e54670/libavcodec/j2kenc.c#L1822
Why it is printing ffmpeg -h encoder=jpeg2000
-pred <int> E..V....... DWT Type (from 0 to 1) (default dwt97int) dwt97int 0 E..V....... dwt53 0 E..V.......Why dwt53 is 0?? it should be 1, no?