On 2020-03-04 00:16, James Darnley wrote:
> On 2020-03-03 23:07, Ulf Zibis wrote:
>> $ ~/Projects/ffmpeg/ffmpeg-git-20200211-amd64-static/ffmpeg -i
>> 20200205_165401.mp4 -f ffmetadata 20200205_165401.meta
>
>> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20200205_165401.mp4':
>> Metadata:
>> major_brand : mp42
>> minor_version : 0
>> compatible_brands: isommp42
>> creation_time : 2020-02-05T19:55:01.000000Z
>> location : -00.7655-047.1715/
>> location-eng : -00.7655-047.1715/
>> com.android.version: 8.0.0
>> Duration: 00:00:58.65, start: 0.000000, bitrate: 17273 kb/s
>
>> File '20200205_165401.meta' already exists. Overwrite? [y/N] y
>> Output #0, ffmetadata, to '20200205_165401.meta':
>> Metadata:
>> major_brand : mp42
>> minor_version : 0
>> compatible_brands: isommp42
>> com.android.version: 8.0.0
>> location : -00.7655-047.1715/
>> location-eng : -00.7655-047.1715/
>> encoder : Lavf58.38.100
>> Stream mapping:
>> Press [q] to stop, [?] for help
>
> It is clearly present in the input file's metadata so how is it not
> copied into the output file?
>
> To the source!
>
Here's the answer.
> commit e377208d43
> Author: Michael Niedermayer <michae...@gmx.at>
> Date: Thu Jun 28 17:09:36 2012 +0200
>
> ffmpeg: dont copy creation_time as the destination file is not created at
> that time
>
> Fixes Ticket1439
>
> Signed-off-by: Michael Niedermayer <michae...@gmx.at>
>
> diff --git a/ffmpeg.c b/ffmpeg.c
> index f6ce70b8f2..aa16e05f7e 100644
> --- a/ffmpeg.c
> +++ b/ffmpeg.c
> @@ -5242,6 +5242,7 @@ loop_end:
> AV_DICT_DONT_OVERWRITE);
> if(o->recording_time != INT64_MAX)
> av_dict_set(&oc->metadata, "duration", NULL, 0);
> + av_dict_set(&oc->metadata, "creation_time", NULL, 0);
> }
> if (!o->metadata_streams_manual)
> for (i = output_files[nb_output_files - 1]->ost_index; i <
> nb_output_streams; i++) {
Trac ticket cause: http://trac.ffmpeg.org/ticket/1439
I would say: use ffprobe to get the metadata of files.
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