[FFmpeg-user] Different MD5 hashes for identical tracks

[Reindl Harald]

Am 30.06.20 um 20:51 schrieb raistlin.mlists at yandex.ru:
> Hello Reindl,
> 
>>> There are 2 sample m2ts files (about 84 MB each):
>>> https://mir.cr/0Y8ROTYT (1)
>>> https://mir.cr/RFI1MNOM (2)
>>>
>>> Stream a:5 in (1) and stream a:4 in (2) are identical (being binary
>>> compared). Though ffmpeg reports they have different MD5 hashes:
>>>
>>> ffmpeg -loglevel 4 -i 00001.m2ts -map 0:a:5 -codec copy -f md5 -
>>> MD5=cee9775826b81d395c7d012e69309270
>>>
>>> ffmpeg -loglevel 4 -i 00000.m2ts  -map 0:a:4 -codec copy -f md5 -
>>> MD5=32ccb6d7af46bfdd2100cd68c7622171
>>>
>>> MD5 hashes for these streams being decoded (without '-codec copy') are
>>> also different.
>>>
>>> How could it be
> 
>> most files have timestamps inside
> 
> Are these timestamps removed by demuxing? As I wrote demuxed tracks
> are byte-to-byte identical

you use diff?