[FFmpeg-user] Copy all metadata fields?

[Paul B Mahol]

On 3/18/20, Ulf Zibis <Ulf.Zibis at gmx.de> wrote:
> Hi Peter,
>
> you can use "-map_metadata 0".
> It copies all possible metadata from input to output.

I'm sure that color information is not part of that metadata.
And it must be set manually.


>
> -Ulf
>
> Am 18.03.20 um 07:49 schrieb Peter B.:
>> 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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