Boxee

Flac 5.1 audio seriously lags against H264 in MKV container

Details

  • Severity:
    Minor
  • Version:
    1.0.4.17443
  • Operating System:
    Boxee Box
  • Number of attachments:
    1

Description

Steps to reproduce:

1 - Ripped one of my blu-rays to m2ts
2 - Encoded mkv container, H264 video
3 - Encoded Flac 5.1 Level 5 soundtrack from m2ts
4 - muxxed mkv video and flac soundtrack to mkv
5 - Soundtrack lags video by around 0.5 seconds
6 - Altering sound / video sync in Boxee menu does not correct this
7 - This video plays fine on VLC media player
8 - Tried different Flac Levels but issue still occurs

Is this a problem with Flac? Is Flac for some reason not hardware accelerated or something?

I can't really send a sample file because they are all 9 gigs or so in size, but I can send steps to reproduce this issue and the tools I used if required.

Issue Links

relates

Bug - A problem which impairs or prevents the functions of the product. BOXEE-9460 Drop out on mkv files with flac audio

  • P3 -
  • Closed - The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.

Activity

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Ami Ben-David [Boxee] added a comment -
Gil, please upload a sample file to Boxee FTP server:
ftp.boxee.tv

user: dropbox
pass: swA4EQAt

Also, please rename the file to match the jira Id such as BOXEE-9234.mkv
Show
Ami Ben-David [Boxee] added a comment - Gil, please upload a sample file to Boxee FTP server: ftp.boxee.tv user: dropbox pass: swA4EQAt Also, please rename the file to match the jira Id such as BOXEE-9234 .mkv
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Eli Semory [Boxee] added a comment -
Is this a regression or did you not test it with previous versions?
Ignoring the delay, does the audio comes out correctly?

FLAC decoding is not hardware accelerated (AFAIK there aren't any streamers out there which can hardware decode FLAC).
Is there a reason the encode the audio with FLAC? I guess the original soundtrack is probably Dolby or DTS.
Show
Eli Semory [Boxee] added a comment - Is this a regression or did you not test it with previous versions? Ignoring the delay, does the audio comes out correctly? FLAC decoding is not hardware accelerated (AFAIK there aren't any streamers out there which can hardware decode FLAC). Is there a reason the encode the audio with FLAC? I guess the original soundtrack is probably Dolby or DTS.
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Gil Hamlin added a comment -
Sorry - for some reason the firmware version is wrong - it's the 17743 build (1.04) - the latest publicly available build.

The audio is 99.5% correct ignoring the delay - there is an occasional "pop" or dropout, but this literally lasts less than a quarter of a second and is very infrequent.

Soundtrack is FLAC encoded because I wanted to find a lossless but more compatible alternative to DTS, so FLAC seemed to be the way to go. Open to suggestions if anything might work better :)

With regards to uploading a file - the only samples I really have are my completed rips - about 9 gigs or so.... is it okay to upload something this big?

I have attached mediainfo for your reference...

Show
Gil Hamlin added a comment - Sorry - for some reason the firmware version is wrong - it's the 17743 build (1.04) - the latest publicly available build. The audio is 99.5% correct ignoring the delay - there is an occasional "pop" or dropout, but this literally lasts less than a quarter of a second and is very infrequent. Soundtrack is FLAC encoded because I wanted to find a lossless but more compatible alternative to DTS, so FLAC seemed to be the way to go. Open to suggestions if anything might work better :) With regards to uploading a file - the only samples I really have are my completed rips - about 9 gigs or so.... is it okay to upload something this big? I have attached mediainfo for your reference...
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Gil Hamlin added a comment -
Media Info for sample file
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Gil Hamlin added a comment - Media Info for sample file
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Jean-Philippe Scotto Di Rinaldi added a comment -
Instead of creating a new issue wich may duplicate, i prefer adding a comment.
I've very recently (1 week) bought a Boxee Box.
All audio is decoded by the Boxee and send to HDMI (i've no hardware audio decoder device). Files are read from an USB HDD.
I've almost only watch 1080p anime (H.264 Level 4.1 compliant) (file size can be from 800MB to 3GB for 25mn) during half a day, a dozen of files, wich were all in flac audio 2.0 (16 and 24bits), and switched back to my old device because of audio.
There is, as described, "constantly" (but not specialy regularly) "pop" or dropout very very very short, wich almost immediatly gives a strange bad feeling from the audio. It gives some kind of feeling that the Boxee seems to have trouble to decode audio while decoding video and displaying subtitles. I've nevertheless, in my case, not experienced out of synch from audio/video. I don't have Flac 5.1 mkv files.
Show
Jean-Philippe Scotto Di Rinaldi added a comment - Instead of creating a new issue wich may duplicate, i prefer adding a comment. I've very recently (1 week) bought a Boxee Box. All audio is decoded by the Boxee and send to HDMI (i've no hardware audio decoder device). Files are read from an USB HDD. I've almost only watch 1080p anime (H.264 Level 4.1 compliant) (file size can be from 800MB to 3GB for 25mn) during half a day, a dozen of files, wich were all in flac audio 2.0 (16 and 24bits), and switched back to my old device because of audio. There is, as described, "constantly" (but not specialy regularly) "pop" or dropout very very very short, wich almost immediatly gives a strange bad feeling from the audio. It gives some kind of feeling that the Boxee seems to have trouble to decode audio while decoding video and displaying subtitles. I've nevertheless, in my case, not experienced out of synch from audio/video. I don't have Flac 5.1 mkv files.
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Ami Ben-David [Boxee] added a comment -
Jean, try this issue http://jira.boxee.tv/browse/BOXEE-8226 , i think this is the same issue you described.
this specific one is regarding A/V sync issue.
Show
Ami Ben-David [Boxee] added a comment - Jean, try this issue http://jira.boxee.tv/browse/BOXEE-8226 , i think this is the same issue you described. this specific one is regarding A/V sync issue.
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Jean-Philippe Scotto Di Rinaldi added a comment - - edited
Apparently not, it's talking only about a problem when starting/resume.
What i'm having is always present during play, like a very very little scratch/noise/dropout while playing.
I mention here because of what Gil Hamlin said : "there is an occasional "pop" or dropout, but this literally lasts less than a quarter of a second and is very infrequent."
If you prefer, i'll create another issue.
Show
Jean-Philippe Scotto Di Rinaldi added a comment - - edited Apparently not, it's talking only about a problem when starting/resume. What i'm having is always present during play, like a very very little scratch/noise/dropout while playing. I mention here because of what Gil Hamlin said : "there is an occasional "pop" or dropout, but this literally lasts less than a quarter of a second and is very infrequent." If you prefer, i'll create another issue.
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Ami Ben-David [Boxee] added a comment -
Jean,
what audio type are you referring to? Gil Hamlin is referring to specific videos with FLAC audio.
Show
Ami Ben-David [Boxee] added a comment - Jean, what audio type are you referring to? Gil Hamlin is referring to specific videos with FLAC audio.
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Ami Ben-David [Boxee] added a comment -
Gil, Can you please provide a sample file and upload it to the ftp server in previous comments?
Show
Ami Ben-David [Boxee] added a comment - Gil, Can you please provide a sample file and upload it to the ftp server in previous comments?
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Ami Ben-David [Boxee] added a comment -
Guys, can you please confirm this issue on 1.1.1.19092?
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Ami Ben-David [Boxee] added a comment - Guys, can you please confirm this issue on 1.1.1.19092?
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Jean-Philippe Scotto Di Rinaldi added a comment -
@eli
According here : http://www.pioneer.eu/eur/products/42/98/405/VSX-921/specs.html
now there is maybe the Pioneer VSX-921 wich could decode FLAC.
Show
Jean-Philippe Scotto Di Rinaldi added a comment - @eli According here : http://www.pioneer.eu/eur/products/42/98/405/VSX-921/specs.html now there is maybe the Pioneer VSX-921 wich could decode FLAC.
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Ami Ben-David [Boxee] added a comment -
Guys, can one of you please upload a sample file?

It would help us reproduce and fix the issue if you could please upload the file or a file sample to the "incoming" directory at
ftp://ftp.boxee.tv
user: dropbox
pass: swA4EQAt

Before uploading, Rename the file to include the issue number in its file name.
This is a write only FTP, and other people will not see your files.
You can use the FTP client from http://filezilla-project.org/
Show
Ami Ben-David [Boxee] added a comment - Guys, can one of you please upload a sample file? It would help us reproduce and fix the issue if you could please upload the file or a file sample to the "incoming" directory at ftp://ftp.boxee.tv user: dropbox pass: swA4EQAt Before uploading, Rename the file to include the issue number in its file name. This is a write only FTP, and other people will not see your files. You can use the FTP client from http://filezilla-project.org/
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Ami Ben-David [Boxee] added a comment -
closed as incomplete
no response from the reporter
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Ami Ben-David [Boxee] added a comment - closed as incomplete no response from the reporter

People

  • Assignee:
    Ami Ben-David [Boxee]
    Reporter:
    Gil Hamlin
Vote (1)
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Dates

  • Created:
    Updated:
    Resolved: