> I have tried the following commands
>
> ffmpeg -err_detect ignore_err -i old.mp4 -c copy new.mp4
> ...
> [mov,mp4,m4a,3gp,3g2,mj2 @ 00158b00] stream 1, contradictionary STSC and
> STCO
> [mov,mp4,m4a,3gp,3g2,mj2 @ 00158b00] error reading header
Hmm, I see.
Maybe one last "cheap" attempt: if yo
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
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
l
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,
On 9/22/24 09:22, Alan Chen via ffmpeg-user wrote:
> 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
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
>
> 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?
>
Tha
>
>
>
> > 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
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?
___
Alan Chen via ffmpeg-user wrote:
> ffprobe -print_format json -show_packets -show_streams -show_entries
> packet=pts,duration,size,codec_type,pos test.mp4 > test.mp4.info
You need to provide more information.
What are the contents of test.mp4? What codecs?
> I extract the raw data of the pack
On 21-09-2024 12:32, Alan Chen via ffmpeg-user wrote:
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
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
On 21-09-2024 10:57, Alan Chen via ffmpeg-user wrote:
I try on another MP4 file with H264 codec video, but still get the same
result.
___
Your file needs to conform to te specifications in either part 12 and/or
14 of the standard in which the .MP4
I try on another MP4 file with H264 codec video, but still get the same
result.
___
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On 21-09-2024 04:39, Alan Chen via ffmpeg-user wrote:
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, suc
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