Opened 11 years ago
Closed 11 years ago
#2951 closed defect (needs_more_info)
Crashes when post-processing streams decoded with "mpegvideo"
| Reported by: | Warren Black | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Summary of the bug:
If one attempts to post-process a stream decoded with "mpegvideo.c", you get a hardware access violation because "ff_mpv_export_qp_table" sets "offset" to an odd value and subtracts it from "ref->data", causing that previously-aligned pointer to become odd. That odd pointer is later used as the "QP_store" argument to "pp_postprocess", which casts it to a "uint32_t *" and attempts to dereference it.
How to reproduce:
Attempt to postprocess a stream decoded with "mpegvideo".
Change History (4)
comment:1 by , 11 years ago
comment:2 by , 11 years ago
If the crash is reproducible with ffmpeg (the command line application) please provide the command line (including complete, uncut console output), if a program using the libraries is necessary, please provide source code.
In any case, please provide gdb output as explained on http://ffmpeg.org/bugreports.html
comment:3 by , 11 years ago
Sorry, I don't know which live streams cause the error, just that some do. At any rate, I don't need a fix, as I have a workaround -- just trying to help FFMPEG by reporting the bug and explaining how it can be easily seen in source code. Thanks....
comment:4 by , 11 years ago
| Resolution: | → needs_more_info |
|---|---|
| Status: | new → closed |
Please do not hesitate to reopen this ticket if you can add more information!
"subtracts" --> "adds", sorry.