[FFmpeg-trac] #7567(undetermined:new): Incorrect timetamps when decoding teletext subtitles from TS file
FFmpeg
trac at avcodec.org
Tue Dec 18 12:55:37 EET 2018
#7567: Incorrect timetamps when decoding teletext subtitles from TS file
-------------------------------------+-------------------------------------
Reporter: ExTechOp | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: mpegts | Resolution:
dvb_teletext | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by ExTechOp):
The json file produced for the 50Mbyte sample I used above is about 7.2M,
is there some ready-made library/program to interpret it? Or would a short
sample of it help?
{{{
% ffprobe -v verbose -of json -show_programs -show_packets 50Mbytes-
Frontline-Trump\'s_Showdown.ts > 50Mbytes-Frontline-Trump\'s_Showdown-
packets_and_programs.json
ffprobe version N-92549-g3317155 Copyright (c) 2007-2018 the FFmpeg
developers
built with gcc 8 (GCC)
configuration: --prefix=/home/otto/ffmpeg_build --pkg-config-
flags=--static --extra-cflags=-I/home/otto/ffmpeg_build/include --extra-
ldflags=-L/home/otto/ffmpeg_build/lib --extra-libs=-lpthread --extra-
libs=-lm --bindir=/home/otto/bin --enable-gpl --enable-libfdk_aac
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-
nonfree --enable-libzvbi
libavutil 56. 24.101 / 56. 24.101
libavcodec 58. 40.100 / 58. 40.100
libavformat 58. 23.100 / 58. 23.100
libavdevice 58. 6.100 / 58. 6.100
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
[mpegts @ 0x3bbf9c0] parser not found for codec dvb_teletext, packets or
times may be invalid.
[libzvbi_teletextdec @ 0x3be8800] page filter: *
[mpegts @ 0x3bbf9c0] parser not found for codec dvb_teletext, packets or
times may be invalid.
[mpeg2video @ 0x3be4100] Invalid frame dimensions 0x0.
[mp3float @ 0x3be52c0] Header missing
[mp3float @ 0x3be6480] Header missing
[mpegts @ 0x3bbf9c0] max_analyze_duration 5000000 reached at 5882944
microseconds st:4
[mpegts @ 0x3bbf9c0] start time for stream 3 is not set in
estimate_timings_from_pts
[mpegts @ 0x3bbf9c0] PES packet size mismatch
Last message repeated 2 times
Input #0, mpegts, from '50Mbytes-Frontline-Trump's_Showdown.ts':
Duration: 00:01:51.35, start: 74490.161789, bitrate: 3678 kb/s
Program 17
Stream #0:0[0x200]: Video: mpeg2video (Main), 1 reference frame
([2][0][0][0] / 0x0002), yuv420p(tv, top first, left), 720x576 [SAR 64:45
DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x28a](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 224 kb/s
Stream #0:2[0x28c](dut): Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 160 kb/s (visual impaired) (descriptions)
Stream #0:3[0x403](fin): Subtitle: dvb_subtitle ([6][0][0][0] /
0x0006)
Stream #0:4[0x1388](fin): Subtitle: dvb_teletext ([6][0][0][0] /
0x0006)
Program 33
Program 81
Program 200
Program 351
[libzvbi_teletextdec @ 0x3c73980] page filter: *
Processing read interval id:0 start:N/A end:N/A
[mpegts @ 0x3bbf9c0] PES packet size mismatch
Last message repeated 2 times
[AVIOContext @ 0x3bc89c0] Statistics: 55054480 bytes read, 2 seeks
}}}
Strangely, adding the -fix_sub_duration option produces just an empty srt
file:
{{{
% ffmpeg -txt_page 451 -txt_format text -fix_sub_duration -i "50Mbytes-
Frontline-Trump's_Showdown.ts" -map 0:4 -an -vn -scodec srt "50Mbytes-
Frontline-Trump's_Showdown.fin.srt"
ffmpeg version N-92549-g3317155 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8 (GCC)
configuration: --prefix=/home/otto/ffmpeg_build --pkg-config-
flags=--static --extra-cflags=-I/home/otto/ffmpeg_build/include --extra-
ldflags=-L/home/otto/ffmpeg_build/lib --extra-libs=-lpthread --extra-
libs=-lm --bindir=/home/otto/bin --enable-gpl --enable-libfdk_aac
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-
nonfree --enable-libzvbi
libavutil 56. 24.101 / 56. 24.101
libavcodec 58. 40.100 / 58. 40.100
libavformat 58. 23.100 / 58. 23.100
libavdevice 58. 6.100 / 58. 6.100
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
[mpeg2video @ 0x328d840] Invalid frame dimensions 0x0.
[mp3float @ 0x328e980] Header missing
[mp3float @ 0x328fb40] Header missing
[mpegts @ 0x3269080] start time for stream 3 is not set in
estimate_timings_from_pts
[mpegts @ 0x3269080] PES packet size mismatch
Last message repeated 2 times
Input #0, mpegts, from '50Mbytes-Frontline-Trump's_Showdown.ts':
Duration: 00:01:51.35, start: 74490.161789, bitrate: 3678 kb/s
Program 17
Stream #0:0[0x200]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k
tbn, 50 tbc
Stream #0:1[0x28a](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 224 kb/s
Stream #0:2[0x28c](dut): Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 160 kb/s (visual impaired) (descriptions)
Stream #0:3[0x403](fin): Subtitle: dvb_subtitle ([6][0][0][0] /
0x0006)
Stream #0:4[0x1388](fin): Subtitle: dvb_teletext ([6][0][0][0] /
0x0006)
Program 33
Program 81
Program 200
Program 351
Output #0, srt, to '50Mbytes-Frontline-Trump's_Showdown.fin.srt':
Metadata:
encoder : Lavf58.23.100
Stream #0:0(fin): Subtitle: subrip (srt)
Metadata:
encoder : Lavc58.40.100 srt
Stream mapping:
Stream #0:4 -> #0:0 (dvb_teletext (libzvbi_teletextdec) -> subrip (srt))
Press [q] to stop, [?] for help
[mpegts @ 0x3269080] PES packet size mismatch
50Mbytes-Frontline-Trump's_Showdown.ts: corrupt input packet in stream 4
size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames
parameters if used)
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7567#comment:8>
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