奇数サイズの動画をmp4等に変換しようとするとエラーになる

$ ffmpeg -i infile.webm -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" outfile.mp4
   :
[libx264 @ 0x55950e5c6e40] width not divisible by 2 (559x353)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

サイズ調整して変換

$ ffmpeg -i infile.webm -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" outfile.mp4

$ ffprobe ./pfetch.mp4 -hide_banner -show_entries format 2>/dev/null
[FORMAT]
filename=./pfetch.mp4
nb_streams=1
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=24.240000
size=223463
bit_rate=73750
probe_score=100
TAG:major_brand=isom
TAG:minor_version=512
TAG:compatible_brands=isomiso2avc1mp41
TAG:encoder=Lavf58.20.100
[/FORMAT]

指定情報のみ取得(ここでは duration 動画時間)

$ ffprobe ./pfetch.mp4 -hide_banner -show_entries format=duration 2>/dev/null
[FORMAT]
duration=24.240000
[/FORMAT]

$ ls -1 ./file*.mp4 | xargs -I{} ffprobe {} -hide_banner -show_entries format 2>/dev/null | grep duration | cut -f2 -d= | xargs -I{} echo {}/60|bc
230
120