Opened 18 months ago

Last modified 18 months ago

#8657 new defect

read_intervals parameter in ffprobe skips comma separated intervals

Reported by: zeco Owned by:
Priority: important Component: ffprobe
Version: git-master Keywords: regression
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary of the bug:

As of current versions (tested with ffmpeg 4.2.2), giving ffprobe a comma-separated list of intervals using the -read_intervals parameter will only yield results for the first given interval, while the rest of the list is skipped.

In earlier versions (tested with 3.2.14) ffprobe -read_intervals did process all the given intervals, conforming with the parameter's current documentation.

I can try to pinpoint the first affected version between 3.2.14 and 4.2.2 closer if requested.

How to reproduce:

% ffmpeg-3.2.14/ffprobe -read_intervals 10%+#1,20%+#1,30%+#1 -show_entries frame=pkt_pts_time -v error test.mp4
[FRAME]
pkt_pts_time=8.000000
[/FRAME]
[FRAME]
pkt_pts_time=20.000000
[/FRAME]
[FRAME]
pkt_pts_time=28.000000
[/FRAME]

% ffmpeg-4.2.2/ffprobe -read_intervals 10%+#1,20%+#1,30%+#1 -show_entries frame=pkt_pts_time -v error test.mp4
[FRAME]
pkt_pts_time=8.000000
[/FRAME]

Built on intel + arm.

Specifying time codes as end positions instead of a packet count (+#1) has no effect on the issue either.

Change History (3)

comment:1 by Carl Eugen Hoyos, 18 months ago

Keywords: regression added; read_intervals removed
Priority: normalimportant
Version: 4.2unspecified

Is the issue you see reproducible with current FFmpeg git head, the only version supported on this bug tracker?

Please provide the command line you tested with default or higher log level together with the complete, uncut console output to make this a valid ticket.

comment:2 by zeco, 18 months ago

The issue is reproducible with the current FFmpeg git head (commit #ba0d785).

Here is the unabridged output from the same command as above (minus -v error for default log level) given to the current git head's version of ffprobe:

% ffprobe -read_intervals 10%+#1,20%+#1,30%+#1 -show_entries frame=pkt_pts_time test.mp4
ffprobe version N-97645-gba0d785 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  configuration: 
  libavutil      56. 43.100 / 56. 43.100
  libavcodec     58. 82.100 / 58. 82.100
  libavformat    58. 43.100 / 58. 43.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 80.100 /  7. 80.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 01:09:56.00, start: 0.000000, bitrate: 7565 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 7560 kb/s, 50 fps, 50 tbr, 16k tbn, 100 tbc (default)
    Metadata:
      handler_name    : VideoHandler
[FRAME]
pkt_pts_time=8.000000
[/FRAME]

The output should resemble what was shown with FFmpeg 3.2.14 above, i.e. there should be data for 3 frames.

comment:3 by Carl Eugen Hoyos, 18 months ago

Version: unspecifiedgit-master
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