Hi everyone!
Is it possible to ask/force FFmpeg to keep as many metadata fields as
technically possible when transcoding or rewrapping?
I understand that not all (container-)formats support the same metadata
fields, but I've noticed for example that when rewrapping, not all
metadata fields that were populated in the input are then present in the
output - even if the format is identical.
Here is an example of rewrapping MOV to MOV where I've noticed the
following data missing in the output (commandline and output see below):
* color information (smpte170m/bt470bg/bt709)
* creation_time (*)
I'm grateful for any hints or suggestions!
Thank you in advance,
Peter
(*) Copying "creation_time" may be controversial, but it would be
amazing to be able to preserve this information in the output (e.g. map
it to a different field?).
Files were created with the following command:
// ------------------------
$ ffmpeg -i in.mov -c copy -map 0 out.mov
// ------------------------
Then metadata checked as follows:
// ------------------------
$ ffmpeg -i in.mov -i out.mov -hide_banner
// ------------------------
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2012-01-18T12:50:53.000000Z
Duration: 00:03:54.80, start: 0.000000, bitrate: 30453 kb/s
Stream #0:0(und): Video: dvvideo (dvcp / 0x70637664),
yuv420p(smpte170m/bt470bg/bt709, bottom coded first (swapped)), 720x576
[SAR 16:15 DAR 4:3], 28800 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr,
25k tbn, 25 tbc (default)
Metadata:
creation_time : 2012-01-18T12:50:53.000000Z
handler_name : Core Media Video
encoder : DV - PAL
timecode : 00:37:50:04
Stream #0:1(und): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2012-01-18T12:50:53.000000Z
handler_name : Core Media Audio
Stream #0:2(und): Data: none (tmcd / 0x64636D74)
Metadata:
creation_time : 2012-01-18T12:50:53.000000Z
handler_name : Core Media Time Code
reel_name : 2001-11-10_KveldsseteKaarvatn
timecode : 00:37:50:04
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.33.100
Duration: 00:03:54.84, start: 0.000000, bitrate: 30333 kb/s
Stream #1:0: Video: dvvideo (dvcp / 0x70637664), yuv420p(bottom
coded first (swapped)), 720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, SAR
59:54 DAR 295:216, 25 fps, 25 tbr, 25k tbn, 25 tbc (default)
Metadata:
handler_name : Core Media Video
encoder : DV - PAL
timecode : 00:37:50:04
Stream #1:1: Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
stereo, s16, 1536 kb/s (default)
Metadata:
handler_name : Core Media Audio
Stream #1:2: Data: none (tmcd / 0x64636D74)
Metadata:
handler_name : Core Media Time Code
reel_name : 2001-11-10_KveldsseteKaarvatn
timecode : 00:37:50:04
At least one output file must be specified
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