CCExtractor version: 0.96.5

Necessary information

• Is this a regression (i.e. did it work before)? Unknown
• What platform did you use? Linux
• What were the used arguments? --hardsubx --tickertext input.mp4

Summary

The --hardsubx --tickertext path appears to be incomplete.

--tickertext is documented as searching for burned-in ticker text at the bottom of the screen, but the current implementation does not send OCR results through the normal subtitle output path.

Instead, it:

1. prints ticker OCR text with printf()
2. writes debug JPEG files into the current working directory
3. never frees the returned Rust string
4. calls strlen() without a NULL check

As a result, the ticker-text path appears to bypass subtitle encoding entirely even though it is exposed as a user-facing option.

Code

src/lib_ccx/hardsubx.c

if (ctx->tickertext)
    hardsubx_process_frames_tickertext(ctx, enc_ctx);

src/lib_ccx/hardsubx_decoder.c

ticker_text = _process_frame_tickertext(ctx, ctx->rgb_frame,
                                        ctx->codec_ctx->width,
                                        ctx->codec_ctx->height,
                                        frame_number);
printf("frame_number: %d\n", frame_number);

if (strlen(ticker_text) > 0)
    printf("%s\n", ticker_text);

There is no add_cc_sub_text() / encode_sub() call in hardsubx_process_frames_tickertext(), so enc_ctx is never used.

src/rust/src/hardsubx/decoder.rs

let write_path: String = format!("./lum_im{}.jpg", index);
pixWrite(write_path_c, lum_im, IFF_JFIF_JPEG as i32);

let write_path: String = format!("./im{}.jpg", index);
pixWrite(write_path_c, lum_im, IFF_JFIF_JPEG as i32);

subtitle_text

The Rust helper writes JPEGs unconditionally and returns a string to C, but the C caller does not call free_rust_c_string(ticker_text).

Expected behavior

--hardsubx --tickertext should route OCR results through the normal subtitle output flow and should not leave debug-only side effects in normal runs.

Suggested Fix

• send ticker OCR results through add_cc_sub_text() / encode_sub()
• remove or guard the pixWrite() calls behind a debug option
• add free_rust_c_string(ticker_text) in the ticker-text path
• add a NULL check before strlen(ticker_text)