Opened 10 years ago
Closed 10 years ago
#3124 closed defect (fixed)
Wrong PTS when seeking in Opus file
| Reported by: | Tuukka Pasanen | Owned by: | |
|---|---|---|---|
| Priority: | minor | Component: | avformat |
| Version: | git-master | Keywords: | Opus, ogg |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
Seeking in Opus file with ffprobe/ffplay everything seems work fine. PTS changes correctly and all works as expected.
Scenario when one wants to seek to X PTS in file and then read Y bytes after that jump Y bytes ahead to read next Y bytes one gets the same output as first readied Y bytes.
If you just keep doing that reading procedure after next Z times you just get new loop to read on. This bug somehow follows the OggS-headers and granule points in Ogg-container. It seems you always got Y bytes from start of the last header-point. On Ogg/Vorbis with or without libvorbis everything works with same code.
https://github.com/illuusio/ffmpeg-example.git have example application to demo this bug report.
Attachments (2)
Change History (4)
by , 10 years ago
| Attachment: | ogg-seek.c added |
|---|
by , 10 years ago
| Attachment: | detodos.opus added |
|---|
comment:1 by , 10 years ago
comment:2 by , 10 years ago
| Keywords: | ogg added |
|---|---|
| Reproduced by developer: | set |
| Resolution: | → fixed |
| Status: | new → closed |
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I believe we're seeing the same issue in Chrome. Specifically, PTS values are going backwards on granule boundaries. There also appears to be issues with the oggopus_private data not being reset after seek (so cur_dts increases forever), but I'm not sure that matters.
I've attached a test case and test file which repro this issue. You can build it like so:
clang ogg-seek.c -lavformat -lavcodec -lavutil -lopus -lpthread -lz
./a.out detodos.opus
You'll see some pts printouts followed by a seek, and then eventually the pts goes backwards in time:
pts: 134088 -- dts: 134088
pts: 95688 -- dts: 95688 <------------ BACKWARDS!