ffmpeg showing incorrect pts

[takis]

When using tstools' tsreport tool ( http://code.google.com/p/tstools/) I got this list of PTS:
126000, 129750, 133500, 137250, 141000, 144750, 148500, 152250, 156000, 126000, 159750, 163500, 167250

When using FFmpeg's filter showinfo the PTS timestamps are totally different:
0, 41667, 83333, 125000, 166667, 208333, 250000, 291667, 333333, 375000, 416667, 458333

When playing the video using libavcodec/libavformat, the timestamps are the same as the ones tsreport shows.

ffmpeg -y -vf showinfo -i seekbug01min.ts -f rawvideo /dev/null
ffmpeg version N-31914-g47219e1, Copyright (c) 2000-2011 the FFmpeg developers

built on Aug 16 2011 14:53:24 with gcc 4.5.2
configuration: --enable-avfilter --enable-frei0r --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-nonfree --enable-pic --enable-pthreads --enable-shared --enable-version3 --enable-x11grab --disable-optimizations
libavutil 51. 12. 0 / 51. 12. 0
libavcodec 53. 10. 0 / 53. 10. 0
libavformat 53. 7. 0 / 53. 7. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 31. 1 / 2. 31. 1
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0

[mpegts @ 0x1176460] Continuity Check Failed

Last message repeated 3 times

Input #0, mpegts, from 'seekbug01min.ts':

Duration: 00:00:00.45, start: 1.400000, bitrate: 178 kb/s
Program 1

Metadata:

service_name : Big Buck Bunny
service_provider: FFmpeg

Stream #0.0[0x100]: Video: h264 (Constrained Baseline), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
Stream #0.1[0x101](und): Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s

[buffer @ 0x117ae40] w:320 h:180 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
Output #0, rawvideo, to '/dev/null':

Metadata:

encoder : Lavf53.7.0
Stream #0.0: Video: rawvideo, yuv420p, 320x180 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 24 tbc

Stream mapping:

Stream #0.0 -> #0.0

Press [q] to stop, ? for help
[mpegts @ 0x1176460] Continuity Check Failed

Last message repeated 1 times

[showinfo @ 0x117d780] n:0 pts:0 pts_time:0.000000 pos:564 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:1 type:I checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x117d780] n:1 pts:41667 pts_time:0.041667 pos:1504 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x117d780] n:2 pts:83333 pts_time:0.083333 pos:1692 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x117d780] n:3 pts:125000 pts_time:0.125000 pos:1880 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x117d780] n:4 pts:166667 pts_time:0.166667 pos:2068 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:321782142 plane_checksum:[966806382 2886587449 591323577 0]
[showinfo @ 0x117d780] n:5 pts:208333 pts_time:0.208333 pos:2632 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:1010078484 plane_checksum:[3458918426 414630700 4286638000 0]
[showinfo @ 0x117d780] n:6 pts:250000 pts_time:0.250000 pos:3196 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:1804330054 plane_checksum:[2996844705 2498675835 1603397403 0]
[showinfo @ 0x117d780] n:7 pts:291667 pts_time:0.291667 pos:3572 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:3219605500 plane_checksum:[916690920 1286459717 3285966513 0]
[showinfo @ 0x117d780] n:8 pts:333333 pts_time:0.333333 pos:4136 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:867321723 plane_checksum:[1520540519 419613641 1910038573 0]
[showinfo @ 0x117d780] n:9 pts:375000 pts_time:0.375000 pos:7708 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:3041545686 plane_checksum:[3034423407 2837631021 3697466652 0]
[showinfo @ 0x117d780] n:10 pts:416667 pts_time:0.416667 pos:8648 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:3795962486 plane_checksum:[2808617211 234344642 3924811946 0]
[showinfo @ 0x117d780] n:11 pts:458333 pts_time:0.458333 pos:9400 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:14086197 plane_checksum:[2486256520 483773749 3300581225 0]
frame= 12 fps= 0 q=0.0 Lsize= 0kB time=00:00:00.50 bitrate= 0.0kbits/s
video:1012kB audio:0kB global headers:0kB muxing overhead -100.000000%

[takis]

TS file used to illustrate the showinfo problem

[saste]

This is because ffmpeg applies an euristics for "normalizing" the input timestamps.
You can use the -copyts option for disabling such behavior.

At this point you may note that the timestamp values will still be different from the ffprobe -show_packets output, although the time values are equivalent, that's because ffmpeg.c rescales all the input timestamps to a timebase of 1/1000000.

In conclusion, the observed behavior is the assumed ffmpeg behavior (although maybe counter-intuitive), tell us if you think there is some problem with it.

[takis]

Frankly, I do find it very confusing, especially as ffplay and ffmpeg show different outputs when showing that same videofilter (showinfo).

ffplay -vf showinfo /srv/files/videos/seekbug01min.ts
ffplay version N-31937-g7c94740, Copyright (c) 2003-2011 the FFmpeg developers

built on Aug 17 2011 11:02:34 with gcc 4.5.2
configuration: --enable-avfilter --enable-frei0r --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-nonfree --enable-pic --enable-pthreads --enable-shared --enable-version3 --enable-x11grab --disable-optimizations
libavutil 51. 12. 0 / 51. 12. 0
libavcodec 53. 10. 0 / 53. 10. 0
libavformat 53. 7. 0 / 53. 7. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 31. 1 / 2. 31. 1
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0

[mpegts @ 0xf16980] Continuity Check Failed

Last message repeated 3 times

Input #0, mpegts, from '/srv/files/videos/seekbug01min.ts':

Duration: 00:00:00.45, start: 1.400000, bitrate: 178 kb/s
Program 1

Metadata:

service_name : Big Buck Bunny
service_provider: FFmpeg

Stream #0.0[0x100]: Video: h264 (Constrained Baseline), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
Stream #0.1[0x101](und): Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s

[mpegts @ 0xf16980] Continuity Check Failed

Last message repeated 1 timesq= 0KB vq= 0KB sq= 0B f=0/0

[showinfo @ 0xf8e9e0] n:0 pts:126000 pts_time:1.400000 pos:564 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:1 type:I checksum:2968688214 plane_checksum:[4270850273 3148466867 3148466867 0]
Frame changed from size:320x192 to size:320x180= 4KB sq= 0B f=0/0
[showinfo @ 0x7f54f802b060] n:0 pts:129750 pts_time:1.441667 pos:1504 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x7f54f802b060] n:1 pts:137250 pts_time:1.525000 pos:1880 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0x7f54f802b060] n:2 pts:141000 pts_time:1.566667 pos:2068 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:321782142 plane_checksum:[966806382 2886587449 591323577 0]
[showinfo @ 0x7f54f802b060] n:3 pts:144750 pts_time:1.608333 pos:2632 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:1010078484 plane_checksum:[3458918426 414630700 4286638000 0]

ffmpeg -y -vf showinfo -i /srv/files/videos/seekbug01min.ts -f rawvideo /dev/null
ffmpeg version N-31937-g7c94740, Copyright (c) 2000-2011 the FFmpeg developers

built on Aug 17 2011 11:02:34 with gcc 4.5.2
configuration: --enable-avfilter --enable-frei0r --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-nonfree --enable-pic --enable-pthreads --enable-shared --enable-version3 --enable-x11grab --disable-optimizations
libavutil 51. 12. 0 / 51. 12. 0
libavcodec 53. 10. 0 / 53. 10. 0
libavformat 53. 7. 0 / 53. 7. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 31. 1 / 2. 31. 1
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0

[mpegts @ 0xed2460] Continuity Check Failed

Last message repeated 3 times

Input #0, mpegts, from '/srv/files/videos/seekbug01min.ts':

Duration: 00:00:00.45, start: 1.400000, bitrate: 178 kb/s
Program 1

Metadata:

service_name : Big Buck Bunny
service_provider: FFmpeg

Stream #0.0[0x100]: Video: h264 (Constrained Baseline), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
Stream #0.1[0x101](und): Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s

[buffer @ 0xed6e60] w:320 h:180 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
Output #0, rawvideo, to '/dev/null':

Metadata:

encoder : Lavf53.7.0
Stream #0.0: Video: rawvideo, yuv420p, 320x180 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 24 tbc

Stream mapping:

Stream #0.0 -> #0.0

Press [q] to stop, ? for help
[mpegts @ 0xed2460] Continuity Check Failed

Last message repeated 1 times

[showinfo @ 0xed97a0] n:0 pts:0 pts_time:0.000000 pos:564 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:1 type:I checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0xed97a0] n:1 pts:41667 pts_time:0.041667 pos:1504 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0xed97a0] n:2 pts:83333 pts_time:0.083333 pos:1692 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]
[showinfo @ 0xed97a0] n:3 pts:125000 pts_time:0.125000 pos:1880 fmt:yuv420p sar:1/1 s:320x180 i:P iskey:0 type:P checksum:603776523 plane_checksum:[3225751762 3029265045 3029265045 0]

[michael]

With -copyts the showinfo timestamps now match exactly.
Is there some issue remaining (better docs? or other) or does this resolve this ticket ?