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I could not send a mp4 using Yahoo! mail because it took around 30 minutes.

On Ubuntu MATE 18.04, I reduced the size using ffmpeg.

ffmpeg -i sm_Julia1.mpr -s hd480 -strict -2  output.mp4

But the file was still too big.

Is there another option?

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  • You can make a video as small as you want. The smaller you make it, the less you will see on it.
    – vanadium
    Jun 7, 2020 at 10:26
  • @llogan size limit for yahoo mail is 25 Mb.
    – fixit7
    Jun 8, 2020 at 22:10
  • 72 seconds. @llogan
    – fixit7
    Jun 9, 2020 at 22:04

2 Answers 2

Reset to default
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split the file using zip:

$ zip -s 100m archive.zip output.mp4

And reassemble with:

$ zip -s 0 archive.zip --out output.zip

Last unzip the archive:

$ unzip output.zip
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Using the file duration (72 seconds) you can use two-pass encoding to output approximately your desired output file size (25 MB). From FFmpeg Wiki: H.264 - Two-Pass:

(25 MiB * 8192 [converts MiB to kBit]) / 72 seconds = ~2844 kBit/s total bitrate
2844 kBit/s - 128 kBit/s (desired audio bitrate) = 2716 kBit/s video bitrate - 5% safety margin = 2580 kBit/s

So use -b:v 2580k:

ffmpeg -y -i input.mp4 -c:v libx264 -an -pass 1 -b:v 2580k -f mp4 /dev/null && ffmpeg -i input.mp4 -c:v libx264 -c:a aac -b:v 2580k -b:a 128k -pass 2 -movflags faststart output.mp4

Result ≈ 24 MB.

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