Opened 10 years ago
Closed 10 years ago
#4251 closed defect (worksforme)
libavformat mis-identifies Quicktime file with 32-bit PCM audio and version 1 STSD table
| Reported by: | Richard Goedeken | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avformat |
| Version: | git-master | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Apple's Quicktime format supports 3 different versions of the Sample Table Description header for audio tracks. For uncompressed audio, Version 0 only supports 8 and 16-bit sample depths. Version 1 supports higher fidelity (24-bit and 32-bit per sample), but in a very confusing way.
I ran across an MOV file which contains 32-bit PCM audio, but libavformat (and ffmpeg, and VLC, and our software which uses libav) mis-identifies it as 16-bit audio.
I created a patch which fixes this defect in libavformat by handling this very narrow MOV parsing case. I will attach a sample MOV file which fails to parse properly with the current libav code, and my proposed patch which correctly handles this file.
Attachments (1)
Change History (3)
by , 10 years ago
| Attachment: | libavformat-quicktime-32bit-audio-fix.diff added |
|---|
comment:1 by , 10 years ago
The 2.5MB upload file size limit is unfortunate. Instead of attaching the test MOV file, I have uploaded it to my website. You can downloaded it here:
http://www.fascinationsoftware.com/media/KMP_Audio_Test.mov
comment:2 by , 10 years ago
| Resolution: | → worksforme |
|---|---|
| Status: | new → closed |
cannot reproduce, please try recent ffmpeg
avformat code patch to fix parsing error