Cannot join .264 and .m4a (aac) and set aspect from 704/368 to 2.35:1

[Budman1]

I have an interim process where I need to join an audio and video (704x368) file together and change the DAR to 2.35:1 with mp4box but none of the dozens of tries has worked correctly. The main script I have been working from is:

"mp4box.exe" -add "%%~ni.264#video:par 1=191:235" -add "%%~ni.m4a#audio"  "%%~niNEW.mp4"

and

MP4Box ^
-add "%%~ni.264#1:fps=23.976" ^
-add "%%~ni.m4a#2" ^
-par 1=64:45 ^
-new "%%~niNEW.mp4"

Changing the PAR numbers gives sometimes the correct video but mediainfo shows a huge height number or else it is unplayable afterward. I'm sure its something simple like I can't read the MP4 guide but if anyone knows a script or information that explains the format of MP4Box better (such as does the colon Par work as well as the -Par), I would appreciate help.

Thank You

[Case]

As setting the par can get complicated, I use a handy calculator to give the desired command: http://tools.rodrigopolo.com/mp4box_aspect_fix/
which generates -par "1=8901646138474496:7246483442976463" (close to 1228:1000) for your given parameters.

[Budman1]

See this is the problem. I tried that page and I get from this:

MP4Box ^
-add "%%~ni.264#1:fps=23.976" ^
-add "%%~ni.m4a#1" ^
-par 1="8901646138474496:7246483442976463" ^
-new "%%~niNEW.mp4"

a CMD screen with last lines as:

AVC-H264 import - frame size 704 x 368 at 23.976 FPS
AVC Import results: 62 samples - Slices: 1 I 29 P 32 B - 1 SEI - 1 IDR
Stream uses forward prediction - stream CTS offset: 2 frames
IsoMedia import - track ID 1 - Audio (SR 48000 - 2 channels)
Saving trimNEW.mp4: 0.500 secs Interleaving

a video that

a mediainfo that says:

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 s 585 ms
Bit rate : 228 kb/s
Maximum bit rate : 442 kb/s
Width : 704 pixels
Height : 368 pixels
Display aspect ratio : 1.913
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Bits/(Pixel*Frame) : 0.037
Stream size : 71.9 KiB (53%)
Encoded date : UTC 2018-01-28 08:13:39
Tagged date : UTC 2018-01-28 08:13:39

Yet it is unplayable with a frozen player and Windows says this for height:

[Attachment 44521 - Click to enlarge]

[Case]

MP4Box -add ni.264#video -add ni.aac#audio -par 1=12284091:10000000 -new OUTPUT.MP4

works for me [sample]. 8901646138474496:7246483442976463 is probably too long numbers for my MP4box, as that errors with: Assertion failed: (strlen(argv[i+1])+1 <= sizeof(szTK)), function mp4boxMain, file main.c, line 2619. Abort trap: 6. So I simplified a bit to 8 digits.

[Budman1]

ok I have it working now but i need to cut on a non-I frame up to the next I frame and convert this segment with an I frame at the start frame. This works and all codec parameters are the same except it is CFR. I joined it to the original VFR with concat just to test and the new resulting video is 6.091 FPS instead of 23.976.

Frame rate mode : Variable
Frame rate : 6.091 FPS
Minimum frame rate : 0.047 FPS
Maximum frame rate : 23.976 FPS

Any way to make ffmpeg convert to h264 with VFR?