#4766 closed defect (fixed)
Regression: Viewing avisynth files in ffplay is extremely laggy (A/V desync)
| Reported by: | nixx | Owned by: | |
|---|---|---|---|
| Priority: | important | Component: | avformat |
| Version: | git-master | Keywords: | avs regression |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
I have been using ffplay to preview Avisynth scripts before and it has worked reasonable well for a while, but I recently updated my ffmpeg executables and now the playback is extremely laggy, but only when the script has audio.
However, if I use
ffmpeg -f avisynth -i test.avs -c copy test.avi
and play the avi file, there is no lag whatsoever.
Even an extremely simple script like
DirectShowSource("test.mp4")
exhibits this behavior.
To reproduce, install Avisynth (http://avisynth.nl/index.php/Main_Page#Official_builds, make sure you install the same arch as your ffmpeg executables) and run
ffplay -f avisynth test.avs
Like I said, any avs script has this issue, but I will attach a test file nonetheless.
Attachments (1)
Change History (12)
by , 9 years ago
| Attachment: | Avisynth test files.zip added |
|---|
comment:1 by , 9 years ago
| Keywords: | avs regression added |
|---|---|
| Priority: | normal → important |
comment:2 by , 9 years ago
ffmpeg still encodes avs files just fine, it's only ffplay that seems to have any issues.
comment:4 by , 9 years ago
Unfortunately I do not have a development environment capable of compiling ffmpeg, so I can't give you any exact information regarding when the bug was introduced.
All I know is that the months old build I was using did not have this problem.
comment:5 by , 9 years ago
Well I suspect b1f78632c681f32c4901a85aa7ee72bf9ca6fece, altough I don't quite see why.
Could you try the zeranoe builds from 20150805 ?
comment:6 by , 9 years ago
The build I was using was from 20150803, so I don't think that would be it.
You made me take a closer look at the zeranoe page and notice the previous builds link though, so I will see if I can find where it starts happening.
comment:7 by , 9 years ago
After testing different zeranoe builds, it seems like this bug was introduced between 3fe962940f1e8fd2f1881c0cee646bd0e52ab204 (20140919) and 33c752be513d09d9dd498beac02c39522d671888 (20140924).
comment:9 by , 9 years ago
It seems avisynth is not setting codec packet timebase.
I have sent a patch to ffmpeg-devel which should fix this.
comment:10 by , 9 years ago
| Component: | ffplay → avformat |
|---|---|
| Resolution: | → fixed |
| Status: | new → closed |
Fixed by Marton Balint in 8009a1f1fdce16a59ea911e2b768e56ec4c8e344
Thank you for the report!
comment:11 by , 9 years ago
I can confirm that it's fixed now. Thank you all for the quick responses.
Is the issue not reproducible with the following command?