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Crash by multi-sample descriptions #1

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VFR-maniac opened this issue Sep 17, 2012 · 1 comment
Closed

Crash by multi-sample descriptions #1

VFR-maniac opened this issue Sep 17, 2012 · 1 comment

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@VFR-maniac
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A sample file encoded with base64 is here.

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CRC16: 77CC
CRC32: 23080A5A
MD5: 65230e334a8710974c60911da5ddb884

@k-takata
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I found the cause of this problem.
A NULL pointer access occurs in the following steps:

  1. MP4File::GetTrackMediaDataName() returns NULL because pAtom->GetNumberOfChildAtoms() returns 2.
    const char *MP4File::GetTrackMediaDataName (MP4TrackId trackId)
  2. MP4GetTrackMediaDataName() returns NULL.
    const char* MP4GetTrackMediaDataName(
  3. NULL pointer access occurs in PrintVideoInfo().
    if (strcasecmp(media_data_name, "encv") == 0) {

I think that the easiest way to fix this problem is adding NULL pointer check in PrintVideoInfo(), but I'm not sure it is the best way to fix this.

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