Subtitle Synchronization Delay in Certain Configurations

[Dydhzo]

Hello I have a problem here are the explanations:

Describe the bug
There is a delay in subtitle synchronization for certain configurations.

To Reproduce
Steps to reproduce the behavior:

1. Run the following curl command to transcode the video:

   curl -X POST http://URL:52001/transcode \
        -H "Content-Type: application/json" \
        -d '{
              "inputs": [
                { 
                  "path": "https://URL.mkv", 
                  "type": "video" 
                },
                { 
                  "path": "https://URL.kv", 
                  "type": "audio", 
                  "language": "kor", 
                  "channels": 2 
                },
                { 
                  "path": "https://URL.srt OU .vtt", 
                  "type": "text", 
                  "language": "fra" 
                }
              ],
              "streams": [
                { 
                  "type": "video", 
                  "codec": "h264", 
                  "height": 360, 
                  "bitrate": 1000000, 
                  "framerate": 23 
                },
                { 
                  "type": "audio", 
                  "codec": "aac", 
                  "bitrate": 128000, 
                  "language": "kor", 
                  "channels": 2 
                },
                { 
                  "type": "text", 
                  "language": "fra" 
                }
              ],
              "segmentSize": 2,
              "packageAfter": true
            }'

Expected behavior
Subtitles should be synchronized properly when playing a video file.

Working Configurations:

• MP4 + VTT: Works without delay
• MP4 + SRT: Works without delay
• MKV + MKV (SRT): Works without delay

Non-working Configurations:

• MKV + VTT: Delayed
• MKV + SRT: Delayed