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fix: Add pasp box to declare square pixels (1:1) for web playback

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The codec string fix caused videos to appear squished on web players
like Shaka. Adding an explicit pixel aspect ratio (pasp) box with
1:1 ratio tells the player not to apply any SAR scaling.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Dean
2026-01-13 12:22:43 -08:00
parent b716608379
commit dd26812a9c
1 changed files with 13 additions and 0 deletions
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13
package/android/src/main/java/com/mrousavy/camera/core/HlsMuxer.kt
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@@ -753,10 +753,23 @@ class HlsMuxer(
dos.writeShort(-1) // pre-defined dos.writeShort(-1) // pre-defined
output.write(buildAvcCBox(sps, pps)) output.write(buildAvcCBox(sps, pps))
output.write(buildPaspBox())
return wrapBox("avc1", output.toByteArray()) return wrapBox("avc1", output.toByteArray())
} }
/**
* Builds pixel aspect ratio box to explicitly declare square pixels (1:1).
* This helps players correctly interpret video dimensions without SAR scaling.
*/
private fun buildPaspBox(): ByteArray {
val output = ByteArrayOutputStream()
val dos = DataOutputStream(output)
dos.writeInt(1) // hSpacing (horizontal)
dos.writeInt(1) // vSpacing (vertical)
return wrapBox("pasp", output.toByteArray())
}
private fun buildAvcCBox(sps: ByteArray, pps: ByteArray): ByteArray { private fun buildAvcCBox(sps: ByteArray, pps: ByteArray): ByteArray {
val output = ByteArrayOutputStream() val output = ByteArrayOutputStream()
val dos = DataOutputStream(output) val dos = DataOutputStream(output)