Thank you.
In that case, what are some video editor software does with the videos?
They can cut some frames from the original video and create a new MP4 file.
Are these software just decode and uncompress everything, then remove some
frames, then re-encode and re-compress the remaining video?
___
>
>
>
> > So, how to reassemble the raw packet data back to a new MP4 file?
>
> That's not possible in general, because your raw packets do not
> contain sufficient information to create an MP4 file.
>
> I suggest that you explain why you are actually doing all of that.
> What is the purpose, what
Hi, Gia
Thank you very much.
The only issue is that the tool needs a similar video to fix the truncated
one. For most of the cases, it is rather difficult to do so. So I still
hope to be able to reassemble a new MP4 with all the existing boxes and
packets in the original MP4 without a reference,
Hi, Vincent,
Thank you for your suggestion.
Let me explain the real case: I have many MP4 files which lost some data in
the tail,
which make them not playable. I analyze these files manually and find the
ftyp and
moov boxes and their child boxes are all OK. But part of the data in mdat
box are
lo
What I remove is the last video and audio packet in each stream. All the
meta data are still there, together with all remaining packet data as
separate files. But I don't know how to utilize them in the commandline to
reassemble the packets.
___
ffmpeg-us
I am using ffmpeg.
I use the following command to get all packet info:
ffprobe -print_format json -show_packets -show_streams -show_entries
packet=pts,duration,size,codec_type,pos test.mp4 > test.mp4.info
Then based on each packet info, such as the one below:
{
"codec_type":
I try on another MP4 file with H264 codec video, but still get the same
result.
___
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Thank you but it produces the same result as before.
I have tried the following commands
ffmpeg -err_detect ignore_err -i old.mp4 -c copy new.mp4
ffmpeg -i old.mp4 -map 0:v -c copy video_only.mp4
ffmpeg -i old.mp4 -map 0:a -c copy audio_only.aac
ffmpeg -i old.mp4 -fflags +genpts -c copy new.mp
