Slow to detect audio-only. #217

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claunia · 2026-01-29T16:38:19Z

claunia commented

2026-01-29 16:38:19 +00:00

Originally created by @mackworth on GitHub (Dec 18, 2016).

Not a big problem, but when ccextractor is run on a PS - MPG with no video track, it seems very slow to finish. I have a 4GB file 2.5 hrs long. On my Macbook, it takes 40 seconds to process (impressive). Without the video track (leaving a 400M audio track), it takes 250 seconds to process (with naturally, no output).

File seems to be a program stream, enabling PS mode
Analyzing data in general mode

Not a recognized header. Searching for next header.
00000000 | A2 2D 2B 7F 3E 4D                                | ?-+>M          
Unknown header 08

Not a recognized header. Searching for next header.
00000000 | 55 55 55 55 55 55                                | UUUUUU          
Creating /Users/hugh/Desktop/golden.srt
Streaming |  00:00
Number of NAL_type_7: 0
Number of VCL_HRD: 0
Number of NAL HRD: 0
Number of jump-in-frames: 0
Number of num_unexpected_sei_length: 0

Total frames time:	  00:00:00:000  (0 frames at 29.97fps)
Done, processing time = 250 seconds

Originally created by @mackworth on GitHub (Dec 18, 2016). Not a big problem, but when ccextractor is run on a PS - MPG with no video track, it seems very slow to finish. I have a 4GB file 2.5 hrs long. On my Macbook, it takes 40 seconds to process (impressive). Without the video track (leaving a 400M audio track), it takes 250 seconds to process (with naturally, no output). ``` File seems to be a program stream, enabling PS mode Analyzing data in general mode Not a recognized header. Searching for next header. 00000000 | A2 2D 2B 7F 3E 4D | ?-+>M Unknown header 08 Not a recognized header. Searching for next header. 00000000 | 55 55 55 55 55 55 | UUUUUU Creating /Users/hugh/Desktop/golden.srt Streaming | 00:00 Number of NAL_type_7: 0 Number of VCL_HRD: 0 Number of NAL HRD: 0 Number of jump-in-frames: 0 Number of num_unexpected_sei_length: 0 Total frames time: 00:00:00:000 (0 frames at 29.97fps) Done, processing time = 250 seconds ```

claunia closed this issue

2026-01-29 16:38:19 +00:00

claunia commented

2026-01-29 16:38:20 +00:00

@cfsmp3 commented on GitHub (Dec 21, 2016):

Not really a bug - until the CC data is found CCExtractor needs to look for it "more thoroughly".

@cfsmp3 commented on GitHub (Dec 21, 2016): Not really a bug - until the CC data is found CCExtractor needs to look for it "more thoroughly".

claunia referenced this issue

2026-01-29 16:59:12 +00:00

[PR #217] [MERGED] Add support for parsing the Service Description Table in MPEGTS #1094

claunia referenced this issue

2026-01-29 16:59:13 +00:00