Opened 15 months ago
Last modified 6 months ago
#11627 open enhancement
Feature request: copy IAMF stream_groups from input file
| Reported by: | gamer191 | Owned by: | Luiz Stangarlin |
|---|---|---|---|
| Priority: | normal | Component: | avformat |
| Version: | git-master | Keywords: | iamf |
| Cc: | gamer191 | Blocked By: | |
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description (last modified by )
Based on the https://ffmpeg.org/ffmpeg-all.html example for "To copy the two stream groups (Audio Element and Mix Presentation) from an input IAMF file with four streams into an mp4 output", and based on https://trac.ffmpeg.org/ticket/11625#comment:1, it appears that ffmpeg does not have the ability to copy an IAMF file without the user manually ffprobing to find the number of input streams, and then writing a -stream_group command
Therefore, I am opening a feature request requesting a command to copy IAMF stream groups from an input file, in order to allow IAMF files to be automatically copied
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
Attachments (3)
Change History (8)
comment:1 by , 15 months ago
| Description: | modified (diff) |
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comment:2 by , 6 months ago
comment:3 by , 6 months ago
| Owner: | set to |
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| Status: | new → open |
by , 6 months ago
| Attachment: | 0002-fix-also-allow-demuxing-iamf-to-iamf-mp4-without-spe.patch added |
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patch to allow copying the stream groups from iamf to iamf/mp4
comment:4 by , 6 months ago
If someone use this, please don't forget to actually map your group streams. Now it will match the ouput streams to the input streams by index. Instead of only the IAMF "tags" (groups and elements and the configuration) being copied.
Example of use:
./ffmpeg-iamf \ -v debug \ -i ./Animated_demo_3OA_and_2_0.iamf \ -t 00:00:01 \ -map 0 \ -c copy \ ./test.iamf
comment:5 by , 6 months ago
| Component: | undetermined → avformat |
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by , 6 months ago
| Attachment: | 0001-fix-allow-demuxing-mp4-to-iamf-without-specifying-gr.patch added |
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patch to copy groups when demuxing and remuxing IAMF
by , 6 months ago
| Attachment: | 0002-fix-allow-demuxing-iamf-to-iamf-mp4-without-specifyi.patch added |
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patch to allow copying the stream groups from iamf to iamf/mp4
Hello, I also have this problem.
It would be convenient if it was possible to copy IAMF stream groups between source MP4 and target MP4.
So I gave a go at implementing it, the idea is to put the IAMF descriptors (the header) on side-data, then the mov decoder can leave it there when it reads the IACB.
Then when it comes back to reencoding, the encoder instead of giving an error because the user didn't pass the arguments on the command line to configure the IAMF groups, it can just read it back from the IAMF descriptors and configure/create the substreams in similar way with the same parameters after deserializing the IAMF descriptor.
I didn't write tests for this, if the implementation is good enough and someone can provide me information on what is needed I can do that.
But this is supposed to be an useful helper and shouldn't cause any problem on the rest of the system.