fix(608): anchor pop-on->roll-up transition start time to first character, not CR

src/lib_ccx/ccx_decoders_608.c

@@ -854,7 +854,10 @@ void handle_command(unsigned char c1, const unsigned char c2, ccx_decoder_608_co
 			// not the character typing time. This matches FFmpeg's timing behavior.
 			if (context->rollup_from_popon && !changes)
 			{
-				context->ts_start_of_current_line = get_fts(context->timing, context->my_field);
+				// Transcript: anchor to CR time for the next write_cc_line().
+				// SRT: preserve first-char time already set by write_char() for cvm at changes=1.
+				if (context->output_format == CCX_OF_TRANSCRIPT)
+					context->ts_start_of_current_line = get_fts(context->timing, context->my_field);
 			}
 			else
 			{

src/lib_ccx/ccx_encoders_common.h

@@ -238,7 +238,7 @@ void write_cc_buffer_to_gui(struct eia608_screen *data, struct encoder_ctx *cont
 int write_cc_buffer_as_g608(struct eia608_screen *data, struct encoder_ctx *context);
 int write_cc_buffer_as_transcript2(struct eia608_screen *data, struct encoder_ctx *context);
 
-void write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx *context, int line_number);
+int write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx *context, int line_number);
 
 int write_cc_subtitle_as_srt(struct cc_subtitle *sub, struct encoder_ctx *context);
 int write_cc_subtitle_as_ssa(struct cc_subtitle *sub, struct encoder_ctx *context);

src/lib_ccx/ccx_encoders_transcript.c

@@ -236,7 +236,7 @@ int write_cc_subtitle_as_transcript(struct cc_subtitle *sub, struct encoder_ctx
 }
 
 // TODO Convert CC line to TEXT format and remove this function
-void write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx *context, int line_number)
+int write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx *context, int line_number)
 {
 	int ret = 0;
 	int length = get_str_basic(context->subline, data->characters[line_number],
@@ -255,7 +255,7 @@ void write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx
 			// is set for example by the write_char function, it possible that we don't have one in empty lines (unclear)
 			// For now, let's not consider this a bug as before and just return.
 			// fatal (EXIT_BUG_BUG, "Bug in timedtranscript (ts_start_of_current_line==-1). Please report.");
-			return;
+			return 0;
 		}
 
 		if (context->transcript_settings->showStartTime)
@@ -333,7 +333,9 @@ void write_cc_line_as_transcript2(struct eia608_screen *data, struct encoder_ctx
 		{
 			mprint("Warning:Loss of data\n");
 		}
+		return 1;
 	}
+	return 0;
 	// fprintf (wb->fh,encoded_crlf);
 }
 
@@ -356,8 +358,7 @@ int write_cc_buffer_as_transcript2(struct eia608_screen *data, struct encoder_ct
 				}
 			}
 
-			write_cc_line_as_transcript2(data, context, i);
-			wrote_something = 1;
+			wrote_something |= write_cc_line_as_transcript2(data, context, i);
 		}
 	}