[FFmpeg-user] Different MD5 hashes for identical tracks

[raistlin.mlists at yandex.ru]

Hello Reindl,

Tuesday, June 30, 2020, 9:58:33 PM, you wrote:



> 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?
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Yes. You can try yourself, that's why I gave the links.

-- 
Best regards,
raistlin.mlists at yandex.ru