// Start custom preview  
recorder = [TXUGCRecord shareInstance];  
[recorder startCameraCustom:param preview:preview];  

// Start recording  
[recorder startRecord];  

// Pausing recording generates a segment, accessible via TXUGCPartsManager  
[recorder pauseRecord];  

// Get the video segment manager  
TXUGCPartsManager *partsManager = recorder.partsManager;  

// Delete the last recorded segment  
[partsManager deleteLastPart];  

// Resume recording  
[recorder resumeRecord];  

// Stop recording and merge all segments into a single video  
[recorder stopRecord];  

// Get total duration of all segments  
[partsManager getDuration];  

// Get paths of all segments  
[partsManager getVideoPathList];  

// Delete the last segment  
[partsManager deleteLastPart];  

// Delete a specific segment (e.g., index 1)  
[partsManager deletePart:1];  

// Delete all segments  
[partsManager deleteAllParts];  

// Insert an external video (non-recorded) into the segment list  
[partsManager insertPart:videoPath atIndex:0];  

// Merge all segments into a final video (also triggered automatically on stopRecord)  
[partsManager joinAllParts:videoOutputPath complete:complete];