Audio and video gaps, what do they mean and how to fix them?

[maldon]

When I demux with "UsEac3to" some .mkv files I find things like that (there are many more lines but I show you only 5):

[v01] Video has a gap of 1 frames at playtime 0:06:12. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:06:15. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:06:18. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:06:21. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:06:24. <WARNING>

The same with audio.

What kind of problem or error do these files have? Is there a way to fix them or are the resulting audio (.ac3) and video (.h264) files already fixed after demuxing?

[videoh]

Apparently, even the author doesn't know the answer:

http://bugs.madshi.net/print_bug_page.php?bug_id=106

[v01] The video bitstream framerate field doesn't seem to match the timestamps. <WARNING>
Demuxing these tracks may still produce correct results - or not. <WARNING>

Could it be due to pulldown?

[tebasuna51]

I don't know if is the pulldown, sometimes are TV captures with lost frames.

Like madshi say the extracted tracks can preserve the sync or not.

If not you need extract the timestamps and apply them to the final mkv.

[maldon]

I don't know if is the pulldown, sometimes are TV captures with lost frames.

Like madshi say the extracted tracks can preserve the sync or not.

If not you need extract the timestamps and apply them to the final mkv.

What do you mean by timestamps, chapters?

I get that warnings with a great number of .MKV movies ripped from Blu-ray. I've tried to demux those MKVs with video and audio and only with video and I still get those video gap warnings.

[tebasuna51]

What do you mean by timestamps, chapters?
The containers have the times when each video frame must be show in the screen.
If the time each frame must be show is not constant we have a Variable Frame Rate. For that the warnings.

You can obtain the timestamps with UsEac3to 'MkvExtract/INF'.

I get that warnings with a great number of .MKV movies ripped from Blu-ray.

By you?
Please explain how do you rip your Blu-ray. AFAIK BD's must be Constant Frame Rate

Remember rule 6, we can't help over downloaded movies.
Also, we can't solve bad jobs from others.

[maldon]

Yes, my rips, ripped from the original Blu-rays. I don't have much experience but I always use "Handbrake". I always select, for instance, Framerate (Same as source), Constant Bitrate, x264 Tune (Film), H.264 Profile (High) and H.264 Level (4.1). I decided to demux some rips with "Useac3to" to test them and I’ve found audio gaps, video gaps, audio overlaps, video overlaps… and I don't know what I've done wrong.

[tebasuna51]

... I always use "Handbrake"...

Please always select Constant Framerate, change the default (Variable Framerate) or you can't do changes after that without preserve the timestamps.

[SeeMoreDigital]

I get that warnings with a great number of .MKV movies ripped from Blu-ray. I've tried to demux those MKVs with video and audio and only with video and I still get those video gap warnings.What's the movie disc source. And what software did you use to decrypt it?

[maldon]

What's the movie disc source. And what software did you use to decrypt it?

I use AnyDVD HD to rip Blu-ray discs. Then, Handbrake to create MKV file.

Here is a partial report (it's very long) with one mkv (Useac3to - Global Parameters (Demux) - RUN):

FIRST 5 MINUTES:

MKV, 1 video track, 1 audio track, 3:08:25, 24p /1.001
1: h264/AVC, English, 1280x544 24p /1.001 (40:17)
2: DTS, English, 1.0 channels, 768kbps, 48kHz
[v01] Extracting video track number 1...
[a02] Extracting audio track number 2...
[v01] Creating file "\\Shared Folders\Desktop\movie.mkv_ - 1 - h264, English, 1280x544 24p.h264"...
[a02] Creating file "\\Shared Folders\Desktop\movie.mkv_ - 2 - DTS, English, 1.0 channels, 768kbps, 48kHz.dts"...
[v01] Video has a gap of 1 frames at playtime 0:03:30. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:34. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:36. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:39. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:43. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:45. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:48. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:51. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:53. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:03:56. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:00. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:03. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:05. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:08. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:12. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:14. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:17. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:20. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:24. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:26. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:29. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:32. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:34. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:38. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:41. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:44. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:46. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:50. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:53. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:55. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:04:58. <WARNING>
[v01] Video has a gap of 1 frames at playtime 0:05:01. <WARNING>

(More video gaps every 2-3 seconds until the end)

LAST 5 MINUTES:

[v01] Video has a gap of 1 frames at playtime 3:05:03. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:06. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:09. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:11. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:15. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:18. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:21. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:24. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:27. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:29. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:33. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:36. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:38. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:41. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:43. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:47. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:50. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:53. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:55. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:05:59. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:01. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:04. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:07. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:11. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:13. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:16. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:19. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:22. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:25. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:28. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:31. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:34. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:37. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:40. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:42. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:45. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:49. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:51. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:55. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:06:58. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:01. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:03. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:07. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:10. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:12. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:15. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:17. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:21. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:24. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:27. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:30. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:33. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:36. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:39. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:41. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:44. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:47. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:51. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:53. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:56. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:07:59. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:08:02. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:08:05. <WARNING>
[v01] Video has a gap of 1 frames at playtime 3:08:08. <WARNING>

Video track 1 contains 271056 frames.
eac3to processing took 7 minutes, 52 seconds.
Done.

[SeeMoreDigital]

As a comparison, I suggest you give MakeMKV a try and encode directly to .mkv...