Attachment 125488 Details for Bug 51118 – Fix MPEG-2 TS detection

[patch] Fix MPEG-2 TS detection

0001-Fix-MPEG-2-TS-detection.patch (text/plain), 2.04 KB, created by Stefan Pöschel on 2016-08-02 18:56:39 UTC

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Creator: Stefan Pöschel

Created: 2016-08-02 18:56:39 UTC

Size: 2.04 KB

patch

obsolete

>From fbfd4b73c7b847145d5e83d125a7e9d1b58d791d Mon Sep 17 00:00:00 2001
>From: =?UTF-8?q?Stefan=20P=C3=B6schel?= <github@basicmaster.de>
>Date: Tue, 2 Aug 2016 20:30:23 +0200
>Subject: [PATCH 1/2] Fix MPEG-2 TS detection
>
>So far the MPEG-2 TS made assumptions which do not hold for the first packet of
>every MPEG-2 TS, e.g. that the Continuity Counter is 0 or the Payload Unit Start
>Indicator is set.
>This alternative approach exploits the fixed packet size of 188 bytes (192 bytes
>with BDAV MPEG-2 TS) and checks the first five packets for the Sync Byte 0x47.
>The used offsets partly seems to be a bit high in contrast to other formats, but
>MPEG-2 TS files are usually much bigger than that.
>
>https://bugs.freedesktop.org/show_bug.cgi?id=51118
>---
> freedesktop.org.xml.in | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
>
>diff --git a/freedesktop.org.xml.in b/freedesktop.org.xml.in
>index 0a4c5fc..015066b 100644
>--- a/freedesktop.org.xml.in
>+++ b/freedesktop.org.xml.in
>@@ -6196,7 +6196,24 @@ command to generate the output files.
>     <acronym>MPEG-2 TS</acronym>
>     <expanded-acronym>Moving Picture Experts Group 2 Transport Stream</expanded-acronym>
>     <magic priority="50">
>-      <match type="big32" value="0x47400010" mask="0xff4000df" offset="0"/>
>+      <match type="byte" value="0x47" offset="0">
>+        <match type="byte" value="0x47" offset="188">
>+          <match type="byte" value="0x47" offset="376">
>+            <match type="byte" value="0x47" offset="564">
>+              <match type="byte" value="0x47" offset="752"/>
>+            </match>
>+          </match>
>+        </match>
>+      </match>
>+      <match type="byte" value="0x47" offset="4">
>+        <match type="byte" value="0x47" offset="196">
>+          <match type="byte" value="0x47" offset="388">
>+            <match type="byte" value="0x47" offset="580">
>+              <match type="byte" value="0x47" offset="772"/>
>+            </match>
>+          </match>
>+        </match>
>+      </match>
>     </magic>
>     <glob pattern="*.m2t"/>
>     <glob pattern="*.m2ts"/>
>-- 
>2.9.2
>

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Attachments on bug 51118: 120922 | 125488 | 125489

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