====== ffprobe - Frame - Count number of frames ======

<code bash>
ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=nb_read_packets -of csv=p=0 input.mp4
</code>

<WRAP info>
**NOTE:**

  * **-v error** -  This hides "info" output (version info, etc) which makes parsing easier (but makes it harder if you ask for help since it hides important info).
  * **-count_frames** - Counts the number of packets per stream and report it in the corresponding stream section.
  * **-select_streams v:0** - Select only the first video stream.
  * **-show_entries stream=nb_read_packets** - Show only the entry for nb_read_frames.
  * **-of csv=p=0** - sets the output formatting. 
    * In this case it hides the descriptions and only shows the value.

</WRAP>

----

===== Get frame count from video file metadata =====

<code bash>
ffprobe -select_streams v:0 -show_entries stream=nb_frames -of default=noprint_wrappers=1 input.mp4
</code>

<WRAP important>
**WARNING:** Fast, but often returns N/A, not reliable.
</WRAP>

----

<code bash>
ffprobe -count_frames -select_streams v:0 -show_entries stream=nb_read_frames -of default=nokey=1:noprint_wrappers=1 input.mp4
</code>

<WRAP important>
**WARNING:**  Pretty slow, can take a minute for longer videos.
</WRAP>

----

<code bash>
ffmpeg -i input.mp4 -map 0:v:0 -c copy -f null -
</code>

<WRAP important>
**WARNING:**  Needs to fully decode video once, which is rather slow.
</WRAP>

----