[video_player_avplay] Runtime ADAPTIVE_INFO BITRATES does not change active bitrate (single VideoTrack + AVAILABLE_BITRATE ladder)

[alensh12]

Summary

For adaptive HLS/DASH streams, PlusPlayer exposes multiple bitrates via
StreamingPropertyType.availableBitrate, but videoTracks often returns only
one track. Setting StreamingPropertyType.adaptiveInfo with
BITRATES=<value> during PLAYING/PAUSED does not change the active
rendition (active track bitrate stays at the highest level).

We need a supported API to lock / unlock ABR quality at runtime when only
a single VideoTrack is exposed.

Related PlusPlayer update:
#781
(Set ABR property : toggle bitrate change functionality) — this appears to
be an engine-side ABR on/off capability, but there is still no documented Dart
API that successfully forces a specific bitrate mid-playback for single-track
ABR streams.

Environment

• Package: video_player_avplay (e.g. 0.8.13)
• Platform: Tizen TV (PlusPlayer)
• Stream type: HLS / DASH (adaptive)
• Same stream on ExoPlayer (Android): multiple video tracks / formats are listed
• On PlusPlayer: videoTracks.length == 1, but AVAILABLE_BITRATE lists N levels

Observed behavior

1. After prepare/play:

   • getStreamingProperty(availableBitrate) →
     249976:399988:799976:1499923:2499893:4499833
   • videoTracks → 1 item:
     id=0 1920x1080 bitrate=4499833 mime=video/x-h264_tz

2. During playback, call:

   controller.setStreamingProperty(
     StreamingPropertyType.adaptiveInfo,
     'BITRATES=249976', // or other ladder value
   );

[xiaowei-guan]

@alensh12
I have reported this issue to MM team, they will support this feature. Once this feature completed, we will create a new PR for you.

[alensh12]

@xiaowei-guan Thanks for your support. Waiting for the feature to be supported.

[gin7773]

hello @alensh12

I've confirmed with the MM team, and there are two solutions for setting a fixed bitrate for HLS playback:

Solution 1: Using RANGE FORMAT

You can use the BITRATES parameter with a range format where min equals max:

BITRATES=<min>~<max>

For example, set BITRATES=460560~460560 to lock the playback at 460560 bps.

Solution 2: Using STARTBITRATE + setAbr (Available after PR #1090 is merged)

After PR #1090 is merged, you can also use the setStreamingProperty API:

final Map<StreamingPropertyType, String> _streamingProperties =
      <StreamingPropertyType, String>{
    StreamingPropertyType.adaptiveInfo: 'STARTBITRATE=460560',
    StreamingPropertyType.setAbr: '0',
  };

Reference: https://github.com/flutter-tizen/plugins/pull/1090/changes#diff-0bb4d74074349730aa556ebf613ccdcb83141311f77815ac8b84a639d6124f02R72-R77

Important Note

Both methods must be configured BEFORE the player is initialized.

Reference for proper timing: https://github.com/flutter-tizen/plugins/pull/1090/changes#diff-0bb4d74074349730aa556ebf613ccdcb83141311f77815ac8b84a639d6124f02R84

Verification

After setting the bitrate, you can verify whether the bitrate is successfully locked by calling getActiveTrackInfo():
This will print the currently active track information, allowing you to confirm that the playback is using the expected fixed bitrate.

Regarding DASH Stream Bitrate

For DASH stream bitrate locking, we are still confirming the details with the MM team. We will update you as soon as possible.

[alensh12]

@gin7773 thanks for HLS solution it working , also had you confirm about the DASH streaming for bitrate locking.

[gin7773]

Hello @alensh12 ,
Regarding the DASH streaming bitrate locking feature, we need your cooperation to proceed with the following steps:

1. Register in Seller Office: https://seller.samsungapps.com/tv
2. Submit a Request: After registration, please submit a request through the Seller Office system describing your requirement for DASH bitrate locking functionality.
3. Wait for Approval: Once your request is submitted, it will go through the internal review and approval process.
4. Code Upload: After the approval process is completed, we will be able to upload and provide the code changes for the DASH bitrate locking feature.

This process is required due to internal policies for distributing certain multimedia-related features. We appreciate your understanding and cooperation.

Please let us know once you have completed the Seller Office registration and submitted your request. Thanks!

[alensh12]

Hello @gin7773 , we are a Partner Seller. We submitted the DASH bitrate locking request in TV Seller Office 1:1 Q&A for NetTV (np.com.nettv). We also asked that bitrate changes resume from the same playback position and not restart the video. Please let us know if you need the Q&A ticket ID.

[gin7773]

Hello @alensh12 ,
Thank you for submitting the request through the TV Seller Office 1:1 Q&A.
Yes, please share the Q&A ticket ID with us so we can track and follow up on your request internally.

[alensh12]

@gin7773 ticket id ---> 2636065862