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You are correct about AVC start codes in extracted samples. AVC samples are stored without start codes, each start code being replaced with a 1, 2 or 4 byte-length field indicating the size of the following NALU. The size of the byte-length field is indicated in the AVCConfigurationBox. In gpac, this corresponds to GF_AVCConfig.nal_unit_size
Note that most systems use 4 bytes, which makes...
2009-11-16 09:19:46 UTC by jeanlf
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Hi,
I am looking for a method to parse down frames from video tracks contained in MP4 files to the NAL level.
Using GPAC, opening a file (through gf\_isom functions) works and retrieving information about the tracks and file works as well (for some reason audio tracks are not extracted correctly, but it's not an issue now).
Getting the number of frames, track size and reading every frame...
2009-11-14 20:44:08 UTC by Moti
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cconcolato committed patchset 1460 of module gpac to the gpac CVS repository, changing 1 files.
2009-11-13 13:16:55 UTC by cconcolato
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cconcolato committed patchset 1459 of module gpac to the gpac CVS repository, changing 3 files.
2009-11-13 13:16:21 UTC by cconcolato
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jeanlf committed patchset 1458 of module gpac to the gpac CVS repository, changing 1 files.
2009-11-12 13:45:45 UTC by jeanlf
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jeanlf committed patchset 1457 of module gpac to the gpac CVS repository, changing 1 files.
2009-11-12 13:44:49 UTC by jeanlf
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jeanlf committed patchset 1456 of module gpac to the gpac CVS repository, changing 1 files.
2009-11-12 13:35:32 UTC by jeanlf
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enst_devs committed patchset 1455 of module gpac to the gpac CVS repository, changing 1 files.
2009-11-12 09:42:37 UTC by enst_devs
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*"GPAC should be able to decrypt and play these streams as long as the keys are available. Howevere, there is no real key delivery mechanism in GPAC. What you can try is use an http(s) location in the kms_uri to indicate where the key is."*
Thank you for the answer! But how can i publish the key in my http location? Maybe i must use an xml file like the one i create for the encryption (the...
2009-11-08 18:26:37 UTC by jumpy84
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If the timeScale is quite high, the DTS numbers start to exceed maximum signed integer number and the export will start outputting negative numbers. Similarly if the input file has DTS numbers greater than maximum signed integer number, the import fails.
2009-11-06 22:22:45 UTC by aktanusa
