Closed Captions are mispelled in Media3

Version

Media3 main branch

More version details

im using:
private val extractorsFactory = DefaultExtractorsFactory().apply { setTsSubtitleFormats( ImmutableList.of( Format.Builder().setSampleMimeType(MimeTypes.APPLICATION_CEA608).build() ) ) }
check the attached stream for reference.
media3 version 1.6.0
Closed captions (CC) are being displayed with spelling errors or garbled/malformed text in Media3, whereas they appear correctly in vlc player.

Devices that reproduce the issue

Android box with media3

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Yes

Reproduction steps

play the attached media and see cc are coming misspelled

Expected result

closed captions should come properly

Actual result

Closed captions are coming mispelled

Media

vlc-record-2025-04-24-11h38m32s-udp___239.255.50.81_7000-.ts.zip

Bug Report

You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.

Thanks for the media, I can reproduce the issue. This is supposed to be handled by ReorderingSeiMessageQueue, but adding some logging it seems that component is completely skipped in this case.

That is happening because when playing H.262 like your stream we pass the CEA data directly to CeaUtil here without reordering it:

media/libraries/extractor/src/main/java/androidx/media3/extractor/ts/UserDataReader.java

Line 79 in 4d7046c

CeaUtil.consumeCcData(pesTimeUs, userDataPayload, outputs);

If I change this to use ReorderingSeiMessageQueue with an arbitrary reorder size of 5, the subtitles display correctly.

In H.264 and H.265 we parse the max re-ordering queue size from the bitstream, and use this to configure ReorderingSeiMessageQueue - but looking at the H.262 spec I can't see an equivalent piece of metadata we can easily use. It says:

When the sequence contains coded B-frames, the number of consecutive coded B-frames is variable and unbounded

Which suggests that there isn't a 'reordering queue size' number we can read.

I'm going to try setting it to 3 arbitrarily...

@icbaker

@icbaker Is there any workaround or fix to solve the cc mispelled issue.

Rename `ReorderingSeiMessageQueue` to remove reference to SEI

Use `ReorderingBufferQueue` in H.262 `UserDataReader`

This is fixed by the commits linked above.

When will this fix be available for use? #2372 I'm currently using version 1.6.0. Do you have any information about the next release that includes the closed captioning issue fix? * Is there any other way I can test the fix in the meantime?* #2372

…

On Tue, Apr 29, 2025 at 8:27 PM Ian Baker ***@***.***> wrote: * This message originated outside of DISH and was sent by: ***@***.*** ***@***.***> ------------------------------icbaker* left a comment (androidx/media#2372) <#2372 (comment)> This is fixed by the commits linked above. — Reply to this email directly, view it on GitHub <#2372 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BERVOZUCZPJR2SJLABJCERL236HOFAVCNFSM6AAAAAB3YPGUVSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMZZGI2DGNZZGE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

The fix will be included in the 1.7.0-alpha01 release, which will likely happen in the next 2-3 weeks.

In the meantime, you can build the library locally from the main branch to get all the latest code changes: https://github.com/androidx/media/blob/release/README.md#locally

any update on the 1.7.0-alpha01 release

…

On Wed, Apr 30, 2025 at 1:29 PM Ian Baker ***@***.***> wrote: * This message originated outside of DISH and was sent by: ***@***.*** ***@***.***> ------------------------------icbaker* left a comment (androidx/media#2372) <#2372 (comment)> The fix will be included in the 1.7.0-alpha01 release, which will likely happen in the next 2-3 weeks. In the meantime, you can build the library locally from the main branch to get all the latest code changes: https://github.com/androidx/media/blob/release/README.md#locally — Reply to this email directly, view it on GitHub <#2372 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BERVOZQVI55Z6CHAWQAFGFL24B7HHAVCNFSM6AAAAAB3YPGUVSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQNBRGEZTSMRZGQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>

1.8.0-alpha01 was released yesterday (there was a problem with the 1.7.0-alpha01 release, hence skipping to 1.8): https://github.com/androidx/media/releases/tag/1.8.0-alpha01

Any idea, when RC will be released for 1.8.0-alpha01? 1.8.0-alpha01 is this stable?

…

On Tue, May 20, 2025 at 1:20 PM Ian Baker ***@***.***> wrote: * This message originated outside of DISH and was sent by: ***@***.*** ***@***.***> ------------------------------icbaker* left a comment (androidx/media#2372) <#2372 (comment)> 1.8.0-alpha01 was released yesterday (there was a problem with the 1.7.0-alpha01 release, hence skipping to 1.8): https://github.com/androidx/media/releases/tag/1.8.0-alpha01 — Reply to this email directly, view it on GitHub <#2372 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BERVOZU7Z7VUU5KFPKBMJ2D27LNCLAVCNFSM6AAAAAB3YPGUVSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQOJTGMYTSNBXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

No and no :)

Haha, thanks!

…

On Tue, May 20, 2025 at 2:19 PM Ian Baker ***@***.***> wrote: * This message originated outside of DISH and was sent by: ***@***.*** ***@***.***> ------------------------------icbaker* left a comment (androidx/media#2372) <#2372 (comment)> No and no :) — Reply to this email directly, view it on GitHub <#2372 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BERVOZSICMDO6XR2KC47VKL27LUBTAVCNFSM6AAAAAB3YPGUVSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQOJTGUYTMNRYGE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

Hi Media3 Team, Hope you're doing well. I wanted to check if there's any estimated timeline for the *Release Candidate (RC)* of *Media3 version 1.8.0-alpha01*. We’re actively planning some upcoming features and would like to align our integration timeline accordingly. Appreciate any insights you can share.

…

On Tue, May 20, 2025 at 2:20 PM Amit Kumar ***@***.***> wrote: Haha, thanks! On Tue, May 20, 2025 at 2:19 PM Ian Baker ***@***.***> wrote: > > * This message originated outside of DISH and was sent by: > ***@***.*** ***@***.***> > ------------------------------icbaker* left a comment > (androidx/media#2372) > <#2372 (comment)> > > No and no :) > > — > Reply to this email directly, view it on GitHub > <#2372 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BERVOZSICMDO6XR2KC47VKL27LUBTAVCNFSM6AAAAAB3YPGUVSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQOJTGUYTMNRYGE> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >

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Closed Captions are mispelled in Media3 #2372

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Closed Captions are mispelled in Media3 #2372

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More version details

Devices that reproduce the issue

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Reproducible in the demo app?

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Expected result

Actual result

Media

Bug Report

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icbaker commented on Apr 28, 2025

amit12kumardish commented on Apr 29, 2025

icbaker commented on Apr 29, 2025

amit12kumardish commented on Apr 30, 2025

icbaker commented on Apr 30, 2025

amit12kumardish commented on May 13, 2025

icbaker commented on May 20, 2025

amit12kumardish commented on May 20, 2025

icbaker commented on May 20, 2025

amit12kumardish commented on May 20, 2025

amit12kumardish commented on Jun 2, 2025

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