How can I remove a single metadata from an MP4 file?

[aveceux]

Hello,

I wish to remove the "original display aspect ratio" metadata from a web-dl MP4 file.

General
Complete name : 1.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 1.61 GiB
Duration : 44 min 45 s
Overall bit rate : 5 140 kb/s
Writing application : Lavf56.15.102

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 44 min 45 s
Bit rate : 5 000 kb/s
Width : 1 920 pixels
Height : 1 072 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.097
Stream size : 1.56 GiB (97%)

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : mp4a-40-2
Duration : 44 min 45 s
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 41.0 MiB (2%)
Default : Yes
Alternate group : 1

Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.15.102
Duration: 00:44:45.12, start: 0.000000, bitrate: 5139 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1072 [SAR 134:135 DAR 16:9], 5000 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler

I tried the following commands,

ffmpeg -i input.mp4 -map_metadata -1 -c copy output.mp4

ffmpeg -i input.mp4 -metadata:s:v:0 original_display_aspect_ratio=0 -c copy output.mp4

ffmpeg -i input.mp4 -metadata:s:v:0 original_display_aspect_ratio="" -c copy output.mp4

ffmpeg -i input.mp4 -bsf:v "filter_units=remove_types=6" -c copy output.mp4

but none of them worked.

I don't think ffmpeg bitstrem filters supports original display aspect ratio, so
"h264_metadata=original_display_aspect_ratio" doesn't work either.

Is it possible to remove the "original display aspect ratio" entry? If so, could anyone please advise me on how to achieve it?

Thank you.

[sneaker]

Try:

ffmpeg -i "input.mp4" -map 0 -c copy -bsf:v "h264_metadata=sample_aspect_ratio=1" -aspect 1920:1072 "output.mp4"

That said, without the file it's difficult to say why exactly ffmpeg is showing this. It doesn't necessarily mean it is an explicit metadata value stored. For example MediaInfo also shows a "File size" line but that doesn't mean it's some kind of explicitly stored metadata. My code doesn't actually remove any metadata, it just sets everything to the most simple sar of 1:1.

[aveceux]

Try:

ffmpeg -i "input.mp4" -map 0 -c copy -bsf:v "h264_metadata=sample_aspect_ratio=1" -aspect 1920:1072 "output.mp4"

That said, without the file it's difficult to say why exactly ffmpeg is showing this. It doesn't necessarily mean it is an explicit metadata value stored. For example MediaInfo also shows a "File size" line but that doesn't mean it's some kind of explicitly stored metadata. My code doesn't actually remove any metadata, it just sets everything to the most simple sar of 1:1.

Thank you very much for your help, sneaker. Your code worked like a charm!
I've tried the aspect command before, but this only kept my player (MPC) from changing its height and width while playing this particular video. The original dar remained intact. Setting the sar to 1 did the job perfectly.
Thanks again!