[FFmpeg-user] How to get TBR in FFProbe JSON

[Ramit Bhalla]

Thank you very much Simon


On Sat, Jun 28, 2014 at 10:41 AM, Simon Thelen <ffmpeg-user at c-14.de> wrote:

> On 28/06/14 at 09:12, Ramit Bhalla wrote:
> > I'm sorry, I meant to say the Actual framerate is given by TBR (not TBC).
> > In the above example the standard output shows:
> > Stream #0:11[0x581]: Video: h264 (Constrained Baseline) ([27][0][0][0] /
> > 0x001B), yuv420p, 320x180, 7.50 fps, 5 tbr,
> >  90k tbn, 14.99 tbc
> >
> > So that shows:
> > FPS -> 7.5
> > TBR -> 5
> > TBC -> 14.99
> >
> > When I use the JSON output I see
> > "index": 11,
> > "codec_name": "h264",
> > "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
> > "profile": "Constrained Baseline",
> > "codec_type": "video",
> > "codec_time_base": "1001/15000",
> > "codec_tag_string": "[27][0][0][0]",
> > "codec_tag": "0x001b",
> > "width": 320,
> > "height": 180,
> > "has_b_frames": 0,
> > "sample_aspect_ratio": "0:1",
> > "display_aspect_ratio": "0:1",
> > "pix_fmt": "yuv420p",
> > "level": 12,
> > "id": "0x581",
> > "r_frame_rate": "5000/1001",
> > "avg_frame_rate": "15/2",
> > "time_base": "1/90000",
> > "start_pts": 7298654101,
> > "start_time": "81096.156678",
> > "duration_ts": 2462460,
> > "duration": "27.360667",
> >
> > This shows:
> > r_frame_rate -> 4.99
> > avg_frame_rate -> 7.5
> >
> > The correct frame rate for this video is 5. So I'm lost now how do get
> this
> > number 5 from the JSON output?
> >
> > i.e. The standard version of the output gives TBR but how do I get the
> TBR
> > in JSON?
> After a little bit of digging through the FFmpeg source code, I can
> verify that the r_frame_rate is the same thing as the tbr, the only
> reason that ffprobe with default output gives it as 5 is because it uses
> the %3.2f format string which will round 4.995 to 5. 4.995 being the
> result of 5000/1001.
>
> --
> Simon Thelen
> purpitation, n.:
>         To take something off the grocery shelf, decide you
>         don't want it, and then put it in another section.
>                 -- "Sniglets", Rich Hall & Friends
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