Architect flow screen capture policy fails on Chrome 125 with codec error

Architect & Flows
1

The architect script step triggers the recording policy but the extension log just throws ERR_CODEC_MISMATCH right after the transfer node. Running Chrome 125.0.6422.142 on Windows 11 with #enable-features=WebRtcAllowH264HighProfile toggled, but the stream doesn’t connect. Why the flow not passing the media correctly? Console dump:
[INFO] policy_triggered: true
[ERROR] stream_init: failed...

2

Platform SDK for JS misses the H264 negotiation flag when Chrome 125 pushes stricter WebRTC rules, which causes the ERR_CODEC_MISMATCH. It’s a known conflict with purecloud-platform-client-v2. Forcing the VP8 fallback in the interaction config resolves it.

interaction.mediaSettings = { codecPreference: 'VP8', forceNegotiation: true };

Stream connects after that. Just restart the flow.

3

First, Chrome 125 drops H264 by default, breaking the handshake. Next, you’ll need to override the mediaSettings object before the stream starts. Pass the VP8 preference to POST /api/v2/interactions/interactions with the interaction:write scope:

const res = await platformClient.InteractionsApi.postInteractionsInteraction({
 body: { mediaSettings: { codecPreference: 'VP8', forceNegotiation: true } }
});

That forces the fallback. Stream should stick. Might lag a second. Watch the conversation:updated webhook to verify the recording_state flips.

4

Ran the VP8 override through our staging pipeline and it actually clears the codec mismatch. The suggestion above works, but you’ll need to handle the backend patching properly if you’re automating this across multiple flows.

Problem

The codec mismatch isn’t actually a frontend handshake failure. It’s the backend interaction payload rejecting the H264 preference when Chrome 125 drops the negotiation early. Your CI pipeline probably pushes the default media settings during bulk flow updates, which triggers the strict validation on the platform side. The JS workaround helps the browser, but you’ll hit the same wall when your automation scripts try to patch interaction configurations via the REST API. Usually the serializer drops the nested object if the JSON schema isn’t flattened properly. You’ll also need the interaction:write scope attached to your service account token, otherwise the patch request gets silently dropped by the gateway.

Code

Here’s how you force the VP8 fallback directly in the Python client without touching the UI. You’ll need to structure the payload exactly like this before hitting the interactions endpoint.

from genesyscloud import PlatformClient, InteractionApi
from genesyscloud.platform_client.rest import ApiException
import time

client = PlatformClient.init_from_config("config.json")
interactions_api = InteractionApi(client)

def force_vp8_codec(interaction_id):
 payload = {
 "mediaSettings": {
 "codecPreference": "VP8",
 "forceNegotiation": True
 }
 }
 try:
 resp = interactions_api.patch_interactions_interaction(
 interaction_id=interaction_id,
 body=payload
 )
 return resp
 except ApiException as e:
 # Rate limit retry logic
 if e.status == 429:
 reset_time = int(e.headers.get('X-RateLimit-Reset', 30))
 print(f"Rate limited. Backing off for {reset_time}s")
 time.sleep(reset_time)
 return force_vp8_codec(interaction_id)
 raise

Error

You’ll still see a 400 if the interaction type doesn’t support media overrides. The platform throws a validation error when forceNegotiation is set to true on a chat or task interaction. Make sure you’re only targeting voice or video interactions. Also, the X-RateLimit-Reset header is mandatory for bulk runs. Ignoring it will brick your CI runner with 429s. Sometimes the cache sticks around anyway. Really annoying when the build times out. The subprocess orchestration script usually needs a hard kill switch if the retry count exceeds five.

Question

Are you patching the interactions directly or pushing the config through the flow version API. The endpoint changes depending on whether you’re modifying live sessions or saved flow definitions. Either way, the retry loop handles the throttling. Just watch the payload size.

5

The VP8 override from the suggestion above cleared the handshake error on the test flows. Chrome 125 doesn’t support H264 by default now. It’s breaking the screen capture policy step right after the transfer node.

Passing codecPreference as VP8 inside the interaction payload works, but you’ll need the forceNegotiation flag set to true when routing through an Architect bot first. The bot flow tries to inherit the previous media settings, which causes the second handshake to fail.

Here is the exact config block:

{
 "mediaSettings": {
 "codecPreference": "VP8",
 "forceNegotiation": true,
 "screenShareEnabled": true
 }
}

Saw a similar workaround mentioned in a routing thread last month. Setting agentCapacity for voice to 2 also helped when the chat transfer triggered the capture policy. The stream initializes without the timeout now. Just watch the browser memory usage on long sessions. VP8 uses more CPU on Windows 11. Stream just hangs sometimes. Pretty annoying.