Lagging replay of videos with h264 codec

I tried to open a video logged from [YARPRobotLoggerDevice](https://github.com/ami-iit/bipedal-locomotion-framework/tree/master/devices/YarpRobotLoggerDevice) with the `h264` codec, set through the

```xml
x264
```

in `yarp-robot-logger.xml`.

Unfortunately when loaded in the visualizer the video is super laggy and it freezes after some time.

- OS: ubuntu 22.04
- robot-log-visualizer version: 0.13.0 installed via conda

This is an example video acquired with this codec.

https://github.com/user-attachments/assets/9c418682-0516-4fc9-9738-993405ee90af

Start by reproducing the lag in robot-log-visualizer 0.13.0 with the linked example video and the video_codec_code setting in yarp-robot-logger.xml. Trace how the visualizer loads H.264 video logged by YarpRobotLoggerDevice, then verify that playback no longer freezes or becomes excessively laggy.

Written by the indexing model from the issue text.