[FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option
r.ricou at b-architech.com
Wed Feb 7 10:30:41 EET 2018
I know this because the size of the video stream isn't the same on the remuxed file. As its duration is the same as I can play it without any problem, I think some metadata were stripped off, but I don't know which and why. You can also see this in the MediaInfo report I included in my original message.
I even tried to do a full remux, with the command ffmpeg -i INPUT_FILE -c copy -map 0 OUTPUT_FILE, and the files size aren't the same at all, there is a 165MB difference on the 16GB file I used (duration: 4m30s). The source one is 17 245 128 240 Byte and the remuxed on is 17 072 370 871 Byte
Here is a pastebin to the full ffmpeg report of the remux process output: https://pastebin.com/1g7wy59u
Full report of the input file: https://pastebin.com/jF1VKWgM
Full report of the output file: https://pastebin.com/hn17PHKC
Note: for the report I used the -probesize 100M option as otherwise I didn't get all the file information because after some time I get the following error message " Probe buffer size limit of 5000000 bytes reached".
De : ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] De la part de Carl Eugen Hoyos
Envoyé : mercredi 7 février 2018 00:36
À : FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Objet : Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option
2018-02-06 18:09 GMT+01:00 Ronan Ricou <r.ricou at b-architech.com>:
> I'm trying to remux a MXF XAVC file with the exact same video but only
> 2 out of the 4 audio tracks.
> For that I use this command:
> ffmpeg -i INPUT_FILE -c copy -map 0:v -map 0:a:0 -map 0:a:1
> The thing is, some video data are lost during the remux as my file is
> smaller than it should be.
How do you know this?
Please test current FFmpeg git head and provide the command line you tested together with the complete, uncut console output.
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