[SOLVED] [ffmpeg] Ways to shrink down file size?

[yetanotherlogin]

Hello

I have a 360MB file that I'd like to shrink down to a smaller size. It's for viewing on a computer, so it doesn't have to be 4K quality:

ffmpeg.exe -i input.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2015-07-29 11:47:51
  Duration: 00:52:04.44, start: 0.000000, bitrate: 929 kb/s

    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 720x406 [SAR 1:1 DAR 360:203], 800 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2015-07-29 11:47:51
      handler_name    : Mainconcept MP4 Video Media Handler
      encoder         : AVC Coding

    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2015-07-29 11:47:51
      handler_name    : Mainconcept MP4 Sound Media Handler

What settings could I try in ffmeg to get down to eg. 100 or 200MB?

Thank you.

[theewizard]

why ??
what PC could you wish to view this, that 360mb is too large a file

or is the real problem you want to send it somewhere and you upload time is slow

i sure would not make it any smaller
IMO 360 is too small for a 52min video

[jagabo]

file size = bitrate * running time

Plus a little overhead for the container. Bitrate is the combined bitrate of all streams. So if you want a smaller file encode with a lower bitrate for the video, audio, or both.

[yetanotherlogin]

Thanks. How can I do this with ffmpeg?

[poisondeathray]

Thanks. How can I do this with ffmpeg?

Set the bitrate

-b:v for video -b:a for audio

Or if you only want to adjust the video, you can use -c:a copy to copy the audio, or re-encode both to reduce both

[yetanotherlogin]

Amazing: Even when using a much lower bitrate for video, I can't tell the difference from the original although the filesize is 1/3 of the original.

200 + 128 = 328kbps total bitrate

ffmpeg -i input.mp4 -b:v 200k -c:v libx264 -vf scale=640:360 -pix_fmt yuv420p -c:a aac -strict experimental -b:a 128k -ac 2 -ar 44100 -threads 2 -f mp4 output.mp4

Thanks!