Losing the first seconds between Stream creation and Stream Prepared #2012
Replies: 2 comments 2 replies
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Another analysis: 
On left we have the OvenMediaPlayer on moment 00:00 Both for the same llhls.m3u8 And yet the VLC is still 1 second forward, the original video starts at 07:31:25 |
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In OvenMediaEngine, when a Live item is scheduled, ScheduledChannel assumes that the target live channel may already be in progress and could be pulled from the middle. For this reason, it does not try to find the “beginning of the live channel.” In most cases, by the time a Live item is scheduled on a ScheduledChannel, the actual beginning of the live channel is already gone. After the live channel is pulled, streaming will start from the next available keyframe. This is not classified as an issue. If there are points that can be improved through discussion, it would be better to register them again. For now, I will move this to discussion. |
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Thank you for the fast reply @getroot I confirm that in the Stream VOD we don't have that problem. The reason why we choose the Schedule Channels was because of the Persistence Channel, because our stream session can take several hours and can lose conection meanwhile. With persistence channel we only have one llhls.m3u8 file which is easy to handle. On Stream side we have several chunks.m3u8 of llhls one per each stream connection and the llhls.m3u8 gets overrwritten the playable chunk with the latest and in that way we lose the capability of playing what was behind, also i don't have a proper way to map/order the chunksfor my stream session, because the only thing that changes is the chunk id. The schedule channel was also easier to manage because we could define a specific name for it making it easier to integrate. Our Persistence Channel has the following structure: So even if we create this channel and only after 10 minutes we start sending video, it won't process the couple of seconds. Is that it? If yes, is there a workaround in the current version of OvenMediaEngine? |
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You can have ScheduledChannel retrieve some of the past buffered data when a live item starts. Simply uncomment the commented code below to make it work: However, this approach has been commented out because it has side effects whenever a live item is switched. Retrieving past data requires further consideration. |
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Im using oven media engine to manage my camera system and my workflow is:
Until now what i've detected is:
The video that im using to Test has a clock in the image and that clock is align with some metadata that im using to print the following logs.
In the original video the clock in the image starts at 2022-07-11 07:31:25
In the oven media llhls the clock in the image start at 2022-07-11 07:31:27 (+/- 2 seconds difference)
My Gstreamer app logs:
Oven Media Engine Logs:
My HLS configuration
In the documentation i can only create a stream via API if it is a RTSP pull stream which is not my case.
I'm asking your help to try to understand where the problem comes from and how can to solve it.
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