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

[Ramit Bhalla]

BTW, I came across this article

https://github.com/x42/harvid/pull/2

it says that r_frame_rate is inaccurate and deprecated and one should use
avg_frame_rate instead. My testing here shows the r_frame_rate to be the
correct one but the article saysotherwise.

Any thoughts?


On Sat, Jun 28, 2014 at 11:20 AM, Ramit Bhalla <ramitbhalla at gmail.com>
wrote:

> 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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>
>