CODEWITHSUNDEEP
ffmpeg
chx
chx

Reputation: 11760

How to recreate an MP4 file

I am trying to replace an MP4 file played back in a relatively restricted environment and so I am trying to create a video file as close to the current one as possible to make sure it'll work. ffprobe has this:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2016-12-07T20:39:51.000000Z
    encoder         : HandBrake 0.9.9 2013051800
  Duration: 00:00:11.01, start: 0.000000, bitrate: 4789 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1080x1920 [SAR 1:1 DAR 9:16], 4648 kb/s, 24 fps, 24 tbr, 90k tbn, 180k tbc (default)

I do not know how to specify mp42 and mp42isomavc1. The rest I have some ideas about: -vf supports setsar and setdar, -pix_fmt yuv420p, -framerate 24.

Upvotes: 0

Views: 1340

Answers (1)

Gyan
Gyan

Reputation: 93048

Assuming that you start with a video input and that resolution doesn't matter, use

ffmpeg -i source -vf setsar=1,format=yuv420p -r 24 \
       -c:v libx264 -profile:v main -video_track_timescale 90k \
       -color_primaries 1 -color_trc 1 -colorspace 1 -color_range 1 \
       -brand mp42 -movflags +faststart out.mp4

FFmpeg does not allow one to manually set the minor_version. When encoding, the encoder will select a codec time base tbc and it's not recommended to manually set it. The color properties are set to match your given input but if your source has different properties and you don't convert them using filters, then these attributes will be false. Of course, your decoder may ignore these container level flags and check only the bitstream.

If your input framerate isn't 24, then ffmpeg will drop/duplicate frames to meet the output rate. Unless your input has a framerate not supported by the player, better to skip the -r option.

Upvotes: 1

Related Questions