diff --git a/media/libstagefright/binding/include/mp4parse.h b/media/libstagefright/binding/include/mp4parse.h
index 6c444e1592ba..7b25afddf3ba 100644
--- a/media/libstagefright/binding/include/mp4parse.h
+++ b/media/libstagefright/binding/include/mp4parse.h
@@ -93,6 +93,8 @@ mp4parse_error mp4parse_get_track_audio_info(mp4parse_parser* parser, uint32_t t
 /// Fill the supplied `mp4parse_track_video_info` with metadata for `track`.
 mp4parse_error mp4parse_get_track_video_info(mp4parse_parser* parser, uint32_t track_index, mp4parse_track_video_info* info);
 
+mp4parse_error mp4parse_is_fragmented(mp4parse_parser* parser, uint32_t track_id, uint8_t* fragmented);
+
 
 
 #ifdef __cplusplus
diff --git a/media/libstagefright/binding/mp4parse/Cargo.toml b/media/libstagefright/binding/mp4parse/Cargo.toml
index 46bf8db0d439..814c4c668812 100644
--- a/media/libstagefright/binding/mp4parse/Cargo.toml
+++ b/media/libstagefright/binding/mp4parse/Cargo.toml
@@ -1,25 +1,28 @@
 [package]
 name = "mp4parse"
-version = "0.4.0"
+version = "0.5.0"
 authors = [
   "Ralph Giles <giles@mozilla.com>",
   "Matthew Gregan <kinetik@flim.org>",
 ]
 
 description = "Parser for ISO base media file format (mp4)"
+documentation = "https://mp4parse-docs.surge.sh/mp4parse/"
 license = "MPL-2.0"
 
 repository = "https://github.com/mozilla/mp4parse-rust"
 
-# Cargo includes random files from the working directory
-# by default! Avoid bloating the package with test files.
+# Avoid complaints about trying to package test files.
 exclude = [
   "*.mp4",
 ]
 
+[dependencies]
+byteorder = { version = "0.5.0", path = "../byteorder" }
+
+[dev-dependencies]
+test-assembler = "0.1.2"
+
 # Somewhat heavy-handed, but we want at least -Z force-overflow-checks=on.
 [profile.release]
 debug-assertions = true
-
-[dependencies]
-byteorder = { path = "../byteorder" }
diff --git a/media/libstagefright/binding/mp4parse/src/boxes.rs b/media/libstagefright/binding/mp4parse/src/boxes.rs
index e1a5b6252995..ece3b6394429 100644
--- a/media/libstagefright/binding/mp4parse/src/boxes.rs
+++ b/media/libstagefright/binding/mp4parse/src/boxes.rs
@@ -54,4 +54,5 @@ box_database!(
     OpusSpecificBox            0x644f7073, // "dOps"
     ProtectedVisualSampleEntry 0x656e6376, // "encv" - Need to check official name in spec.
     ProtectedAudioSampleEntry  0x656e6361, // "enca" - Need to check official name in spec.
+    MovieExtendsBox            0x6d766578, // "mvex"
 );
diff --git a/media/libstagefright/binding/mp4parse/src/lib.rs b/media/libstagefright/binding/mp4parse/src/lib.rs
index 9b94d5e4b9a8..4e8db561d074 100644
--- a/media/libstagefright/binding/mp4parse/src/lib.rs
+++ b/media/libstagefright/binding/mp4parse/src/lib.rs
@@ -13,10 +13,6 @@ use byteorder::ReadBytesExt;
 use std::io::{Read, Take};
 use std::cmp;
 
-// Expose C api wrapper.
-pub mod capi;
-pub use capi::*;
-
 mod boxes;
 use boxes::BoxType;
 
@@ -109,18 +105,18 @@ struct FileTypeBox {
 /// Movie header box 'mvhd'.
 #[derive(Debug)]
 struct MovieHeaderBox {
-    timescale: u32,
+    pub timescale: u32,
     duration: u64,
 }
 
 /// Track header box 'tkhd'
 #[derive(Debug, Clone)]
-struct TrackHeaderBox {
+pub struct TrackHeaderBox {
     track_id: u32,
-    disabled: bool,
-    duration: u64,
-    width: u32,
-    height: u32,
+    pub disabled: bool,
+    pub duration: u64,
+    pub width: u32,
+    pub height: u32,
 }
 
 /// Edit list box 'elst'
@@ -201,7 +197,7 @@ struct SampleDescriptionBox {
 }
 
 #[derive(Debug, Clone)]
-enum SampleEntry {
+pub enum SampleEntry {
     Audio(AudioSampleEntry),
     Video(VideoSampleEntry),
     Unknown,
@@ -209,45 +205,45 @@ enum SampleEntry {
 
 #[allow(non_camel_case_types)]
 #[derive(Debug, Clone)]
-enum AudioCodecSpecific {
+pub enum AudioCodecSpecific {
     ES_Descriptor(Vec<u8>),
     OpusSpecificBox(OpusSpecificBox),
 }
 
 #[derive(Debug, Clone)]
-struct AudioSampleEntry {
+pub struct AudioSampleEntry {
     data_reference_index: u16,
-    channelcount: u16,
-    samplesize: u16,
-    samplerate: u32,
-    codec_specific: AudioCodecSpecific,
+    pub channelcount: u16,
+    pub samplesize: u16,
+    pub samplerate: u32,
+    pub codec_specific: AudioCodecSpecific,
 }
 
 #[derive(Debug, Clone)]
-enum VideoCodecSpecific {
+pub enum VideoCodecSpecific {
     AVCConfig(Vec<u8>),
     VPxConfig(VPxConfigBox),
 }
 
 #[derive(Debug, Clone)]
-struct VideoSampleEntry {
+pub struct VideoSampleEntry {
     data_reference_index: u16,
-    width: u16,
-    height: u16,
-    codec_specific: VideoCodecSpecific,
+    pub width: u16,
+    pub height: u16,
+    pub codec_specific: VideoCodecSpecific,
 }
 
 /// Represent a Video Partition Codec Configuration 'vpcC' box (aka vp9).
 #[derive(Debug, Clone)]
-struct VPxConfigBox {
+pub struct VPxConfigBox {
     profile: u8,
     level: u8,
-    bit_depth: u8,
-    color_space: u8, // Really an enum
-    chroma_subsampling: u8,
+    pub bit_depth: u8,
+    pub color_space: u8, // Really an enum
+    pub chroma_subsampling: u8,
     transfer_function: u8,
     video_full_range: bool,
-    codec_init: Vec<u8>, // Empty for vp8/vp9.
+    pub codec_init: Vec<u8>, // Empty for vp8/vp9.
 }
 
 #[derive(Debug, Clone)]
@@ -259,8 +255,8 @@ struct ChannelMappingTable {
 
 /// Represent an OpusSpecificBox 'dOps'
 #[derive(Debug, Clone)]
-struct OpusSpecificBox {
-    version: u8,
+pub struct OpusSpecificBox {
+    pub version: u8,
     output_channel_count: u8,
     pre_skip: u16,
     input_sample_rate: u32,
@@ -270,73 +266,80 @@ struct OpusSpecificBox {
 }
 
 /// Internal data structures.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct MediaContext {
-    timescale: Option<MediaTimeScale>,
+    pub timescale: Option<MediaTimeScale>,
+    pub has_mvex: bool,
     /// Tracks found in the file.
-    tracks: Vec<Track>,
+    pub tracks: Vec<Track>,
 }
 
 impl MediaContext {
     pub fn new() -> MediaContext {
-        MediaContext {
-            timescale: None,
-            tracks: Vec::new(),
-        }
+        Default::default()
     }
 }
 
 #[derive(Debug)]
-enum TrackType {
+pub enum TrackType {
     Audio,
     Video,
     Unknown,
 }
 
+impl Default for TrackType {
+    fn default() -> Self { TrackType::Unknown }
+}
+
 /// The media's global (mvhd) timescale.
-#[derive(Debug, Copy, Clone)]
-struct MediaTimeScale(u64);
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct MediaTimeScale(pub u64);
 
 /// A time scaled by the media's global (mvhd) timescale.
-#[derive(Debug, Copy, Clone)]
-struct MediaScaledTime(u64);
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct MediaScaledTime(pub u64);
 
 /// The track's local (mdhd) timescale.
-#[derive(Debug, Copy, Clone)]
-struct TrackTimeScale(u64, usize);
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct TrackTimeScale(pub u64, pub usize);
 
 /// A time scaled by the track's local (mdhd) timescale.
-#[derive(Debug, Copy, Clone)]
-struct TrackScaledTime(u64, usize);
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct TrackScaledTime(pub u64, pub usize);
 
-#[derive(Debug)]
-struct Track {
+/// A fragmented file contains no sample data in stts, stsc, and stco.
+#[derive(Debug, Default)]
+pub struct EmptySampleTableBoxes {
+    pub empty_stts : bool,
+    pub empty_stsc : bool,
+    pub empty_stco : bool,
+}
+
+/// Check boxes contain data.
+impl EmptySampleTableBoxes {
+    pub fn all_empty(&self) -> bool {
+        self.empty_stts & self.empty_stsc & self.empty_stco
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct Track {
     id: usize,
-    track_type: TrackType,
-    empty_duration: Option<MediaScaledTime>,
-    media_time: Option<TrackScaledTime>,
-    timescale: Option<TrackTimeScale>,
-    duration: Option<TrackScaledTime>,
-    track_id: Option<u32>,
-    mime_type: String,
-    data: Option<SampleEntry>,
-    tkhd: Option<TrackHeaderBox>, // TODO(kinetik): find a nicer way to export this.
+    pub track_type: TrackType,
+    pub empty_duration: Option<MediaScaledTime>,
+    pub media_time: Option<TrackScaledTime>,
+    pub timescale: Option<TrackTimeScale>,
+    pub duration: Option<TrackScaledTime>,
+    pub track_id: Option<u32>,
+    pub mime_type: String,
+    pub empty_sample_boxes: EmptySampleTableBoxes,
+    pub data: Option<SampleEntry>,
+    pub tkhd: Option<TrackHeaderBox>, // TODO(kinetik): find a nicer way to export this.
 }
 
 impl Track {
     fn new(id: usize) -> Track {
-        Track {
-            id: id,
-            track_type: TrackType::Unknown,
-            empty_duration: None,
-            media_time: None,
-            timescale: None,
-            duration: None,
-            track_id: None,
-            mime_type: String::new(),
-            data: None,
-            tkhd: None,
-        }
+        Track { id: id, ..Default::default() }
     }
 }
 
@@ -454,7 +457,7 @@ macro_rules! check_parser_state {
 
 /// Read the contents of a box, including sub boxes.
 ///
-/// Metadata is accumulated in the passed-through MediaContext struct,
+/// Metadata is accumulated in the passed-through `MediaContext` struct,
 /// which can be examined later.
 pub fn read_mp4<T: Read>(f: &mut T, context: &mut MediaContext) -> Result<()> {
     let mut found_ftyp = false;
@@ -533,6 +536,10 @@ fn read_moov<T: Read>(f: &mut BMFFBox<T>, context: &mut MediaContext) -> Result<
                 try!(read_trak(&mut b, &mut track));
                 context.tracks.push(track);
             }
+            BoxType::MovieExtendsBox => {
+                context.has_mvex = true;
+                try!(skip_box_content(&mut b));
+            }
             _ => try!(skip_box_content(&mut b)),
         };
         check_parser_state!(b.content);
@@ -654,10 +661,12 @@ fn read_stbl<T: Read>(f: &mut BMFFBox<T>, track: &mut Track) -> Result<()> {
             }
             BoxType::TimeToSampleBox => {
                 let stts = try!(read_stts(&mut b));
+                track.empty_sample_boxes.empty_stts = stts.samples.is_empty();
                 log!("{:?}", stts);
             }
             BoxType::SampleToChunkBox => {
                 let stsc = try!(read_stsc(&mut b));
+                track.empty_sample_boxes.empty_stsc = stsc.samples.is_empty();
                 log!("{:?}", stsc);
             }
             BoxType::SampleSizeBox => {
@@ -666,6 +675,7 @@ fn read_stbl<T: Read>(f: &mut BMFFBox<T>, track: &mut Track) -> Result<()> {
             }
             BoxType::ChunkOffsetBox => {
                 let stco = try!(read_stco(&mut b));
+                track.empty_sample_boxes.empty_stco = stco.offsets.is_empty();
                 log!("{:?}", stco);
             }
             BoxType::ChunkLargeOffsetBox => {
@@ -985,7 +995,7 @@ fn read_vpcc<T: Read>(src: &mut BMFFBox<T>) -> Result<VPxConfigBox> {
     })
 }
 
-/// Parse OpusSpecificBox.
+/// Parse `OpusSpecificBox`.
 fn read_dops<T: Read>(src: &mut BMFFBox<T>) -> Result<OpusSpecificBox> {
     let version = try!(src.read_u8());
     if version != 0 {
@@ -1024,13 +1034,13 @@ fn read_dops<T: Read>(src: &mut BMFFBox<T>) -> Result<OpusSpecificBox> {
     })
 }
 
-/// Re-serialize the Opus codec-specific config data as an OpusHead packet.
+/// Re-serialize the Opus codec-specific config data as an `OpusHead` packet.
 ///
 /// Some decoders expect the initialization data in the format used by the
-/// Ogg and WebM encapsulations. To support this we prepend the 'OpusHead'
+/// Ogg and WebM encapsulations. To support this we prepend the `OpusHead`
 /// tag and byte-swap the data from big- to little-endian relative to the
 /// dOps box.
-fn serialize_opus_header<W: byteorder::WriteBytesExt + std::io::Write>(opus: &OpusSpecificBox, dst: &mut W) -> Result<()> {
+pub fn serialize_opus_header<W: byteorder::WriteBytesExt + std::io::Write>(opus: &OpusSpecificBox, dst: &mut W) -> Result<()> {
     match dst.write(b"OpusHead") {
         Err(e) => return Err(Error::from(e)),
         Ok(bytes) => {
@@ -1151,16 +1161,14 @@ fn read_video_desc<T: Read>(src: &mut BMFFBox<T>, track: &mut Track) -> Result<S
         check_parser_state!(b.content);
     }
 
-    if codec_specific.is_none() {
-        return Err(Error::InvalidData("malformed video sample entry"));
-    }
-
-    Ok(SampleEntry::Video(VideoSampleEntry {
-        data_reference_index: data_reference_index,
-        width: width,
-        height: height,
-        codec_specific: codec_specific.unwrap(),
-    }))
+    codec_specific
+        .map(|codec_specific| SampleEntry::Video(VideoSampleEntry {
+            data_reference_index: data_reference_index,
+            width: width,
+            height: height,
+            codec_specific: codec_specific,
+        }))
+        .ok_or_else(|| Error::InvalidData("malformed video sample entry"))
 }
 
 /// Parse an audio description inside an stsd box.
@@ -1235,17 +1243,15 @@ fn read_audio_desc<T: Read>(src: &mut BMFFBox<T>, track: &mut Track) -> Result<S
         check_parser_state!(b.content);
     }
 
-    if codec_specific.is_none() {
-        return Err(Error::InvalidData("malformed audio sample entry"));
-    }
-
-    Ok(SampleEntry::Audio(AudioSampleEntry {
-        data_reference_index: data_reference_index,
-        channelcount: channelcount,
-        samplesize: samplesize,
-        samplerate: samplerate,
-        codec_specific: codec_specific.unwrap(),
-    }))
+    codec_specific
+        .map(|codec_specific| SampleEntry::Audio(AudioSampleEntry {
+            data_reference_index: data_reference_index,
+            channelcount: channelcount,
+            samplesize: samplesize,
+            samplerate: samplerate,
+            codec_specific: codec_specific,
+        }))
+        .ok_or_else(|| Error::InvalidData("malformed audio sample entry"))
 }
 
 /// Parse a stsd box.
@@ -1352,17 +1358,6 @@ fn read_fixed_length_pascal_string<T: Read>(src: &mut T, size: usize) -> Result<
     String::from_utf8(buf).map_err(From::from)
 }
 
-fn media_time_to_ms(time: MediaScaledTime, scale: MediaTimeScale) -> u64 {
-    assert!(scale.0 != 0);
-    time.0 * 1000000 / scale.0
-}
-
-fn track_time_to_ms(time: TrackScaledTime, scale: TrackTimeScale) -> u64 {
-    assert!(time.1 == scale.1);
-    assert!(scale.0 != 0);
-    time.0 * 1000000 / scale.0
-}
-
 fn be_i16<T: ReadBytesExt>(src: &mut T) -> Result<i16> {
     src.read_i16::<byteorder::BigEndian>().map_err(From::from)
 }
diff --git a/media/libstagefright/binding/mp4parse/src/tests.rs b/media/libstagefright/binding/mp4parse/src/tests.rs
index f217343018dc..56e8b0a2d181 100644
--- a/media/libstagefright/binding/mp4parse/src/tests.rs
+++ b/media/libstagefright/binding/mp4parse/src/tests.rs
@@ -6,7 +6,9 @@
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 use std::io::Cursor;
-use super::*;
+use super::read_mp4;
+use super::MediaContext;
+use super::Error;
 extern crate test_assembler;
 use self::test_assembler::*;
 
diff --git a/media/libstagefright/binding/mp4parse_capi/Cargo.toml b/media/libstagefright/binding/mp4parse_capi/Cargo.toml
new file mode 100644
index 000000000000..ecbc8c065a3f
--- /dev/null
+++ b/media/libstagefright/binding/mp4parse_capi/Cargo.toml
@@ -0,0 +1,28 @@
+[package]
+name = "mp4parse_capi"
+version = "0.5.0"
+authors = [
+  "Ralph Giles <giles@mozilla.com>",
+  "Matthew Gregan <kinetik@flim.org>",
+]
+
+description = "Parser for ISO base media file format (mp4)"
+documentation = "https://mp4parse-docs.surge.sh/mp4parse/"
+license = "MPL-2.0"
+
+repository = "https://github.com/mozilla/mp4parse-rust"
+
+# Avoid complaints about trying to package test files.
+exclude = [
+  "*.mp4",
+]
+
+[dependencies]
+"mp4parse" = {version = "0.5.0", path = "../mp4parse"}
+
+[features]
+fuzz = ["mp4parse/fuzz"]
+
+# Somewhat heavy-handed, but we want at least -Z force-overflow-checks=on.
+[profile.release]
+debug-assertions = true
diff --git a/media/libstagefright/binding/mp4parse/build.rs b/media/libstagefright/binding/mp4parse_capi/build.rs
similarity index 91%
rename from media/libstagefright/binding/mp4parse/build.rs
rename to media/libstagefright/binding/mp4parse_capi/build.rs
index 7e3fec4cc066..66019bed52e5 100644
--- a/media/libstagefright/binding/mp4parse/build.rs
+++ b/media/libstagefright/binding/mp4parse_capi/build.rs
@@ -3,7 +3,6 @@ extern crate cheddar;
 fn main() {
     // Generate mp4parse.h.
     cheddar::Cheddar::new().expect("could not read manifest")
-        .module("capi").expect("invalid module path")
         .insert_code("// THIS FILE IS AUTOGENERATED BY mp4parse-rust/build.rs - DO NOT EDIT\n\n")
         .insert_code("// This Source Code Form is subject to the terms of the Mozilla Public\n")
         .insert_code("// License, v. 2.0. If a copy of the MPL was not distributed with this\n")
diff --git a/media/libstagefright/binding/mp4parse/src/capi.rs b/media/libstagefright/binding/mp4parse_capi/src/lib.rs
similarity index 88%
rename from media/libstagefright/binding/mp4parse/src/capi.rs
rename to media/libstagefright/binding/mp4parse_capi/src/lib.rs
index 343d91e5431a..93205675a095 100644
--- a/media/libstagefright/binding/mp4parse/src/capi.rs
+++ b/media/libstagefright/binding/mp4parse_capi/src/lib.rs
@@ -5,7 +5,7 @@
 //! # Examples
 //!
 //! ```rust
-//! extern crate mp4parse;
+//! extern crate mp4parse_capi;
 //! use std::io::Read;
 //!
 //! extern fn buf_read(buf: *mut u8, size: usize, userdata: *mut std::os::raw::c_void) -> isize {
@@ -17,14 +17,16 @@
 //!    }
 //! }
 //!
-//! let mut file = std::fs::File::open("examples/minimal.mp4").unwrap();
-//! let io = mp4parse::mp4parse_io { read: buf_read,
-//!                                  userdata: &mut file as *mut _ as *mut std::os::raw::c_void };
+//! let mut file = std::fs::File::open("../mp4parse/tests/minimal.mp4").unwrap();
+//! let io = mp4parse_capi::mp4parse_io {
+//!     read: buf_read,
+//!     userdata: &mut file as *mut _ as *mut std::os::raw::c_void
+//! };
 //! unsafe {
-//!     let parser = mp4parse::mp4parse_new(&io);
-//!     let rv = mp4parse::mp4parse_read(parser);
-//!     assert_eq!(rv, mp4parse::mp4parse_error::MP4PARSE_OK);
-//!     mp4parse::mp4parse_free(parser);
+//!     let parser = mp4parse_capi::mp4parse_new(&io);
+//!     let rv = mp4parse_capi::mp4parse_read(parser);
+//!     assert_eq!(rv, mp4parse_capi::mp4parse_error::MP4PARSE_OK);
+//!     mp4parse_capi::mp4parse_free(parser);
 //! }
 //! ```
 
@@ -32,21 +34,24 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
-use std;
+extern crate mp4parse;
+
 use std::io::Read;
 use std::collections::HashMap;
 
 // Symbols we need from our rust api.
-use MediaContext;
-use TrackType;
-use read_mp4;
-use Error;
-use media_time_to_ms;
-use track_time_to_ms;
-use SampleEntry;
-use AudioCodecSpecific;
-use VideoCodecSpecific;
-use serialize_opus_header;
+use mp4parse::MediaContext;
+use mp4parse::TrackType;
+use mp4parse::read_mp4;
+use mp4parse::Error;
+use mp4parse::SampleEntry;
+use mp4parse::AudioCodecSpecific;
+use mp4parse::VideoCodecSpecific;
+use mp4parse::MediaTimeScale;
+use mp4parse::MediaScaledTime;
+use mp4parse::TrackTimeScale;
+use mp4parse::TrackScaledTime;
+use mp4parse::serialize_opus_header;
 
 // rusty-cheddar's C enum generation doesn't namespace enum members by
 // prefixing them, so we're forced to do it in our member names until
@@ -266,13 +271,24 @@ pub unsafe extern fn mp4parse_get_track_count(parser: *const mp4parse_parser, co
     let context = (*parser).context();
 
     // Make sure the track count fits in a u32.
-    if context.tracks.len() >= u32::max_value() as usize {
+    if context.tracks.len() > u32::max_value() as usize {
         return MP4PARSE_ERROR_INVALID;
     }
     *count = context.tracks.len() as u32;
     MP4PARSE_OK
 }
 
+fn media_time_to_ms(time: MediaScaledTime, scale: MediaTimeScale) -> u64 {
+    assert!(scale.0 != 0);
+    time.0 * 1000000 / scale.0
+}
+
+fn track_time_to_ms(time: TrackScaledTime, scale: TrackTimeScale) -> u64 {
+    assert!(time.1 == scale.1);
+    assert!(scale.0 != 0);
+    time.0 * 1000000 / scale.0
+}
+
 /// Fill the supplied `mp4parse_track_info` with metadata for `track`.
 #[no_mangle]
 pub unsafe extern fn mp4parse_get_track_info(parser: *mut mp4parse_parser, track_index: u32, info: *mut mp4parse_track_info) -> mp4parse_error {
@@ -310,22 +326,28 @@ pub unsafe extern fn mp4parse_get_track_info(parser: *mut mp4parse_parser, track
         _ => mp4parse_codec::MP4PARSE_CODEC_UNKNOWN,
     };
 
-    // Maybe context & track should just have a single simple is_valid() instead?
-    if context.timescale.is_none() ||
-       context.tracks[track_index].timescale.is_none() ||
-       context.tracks[track_index].duration.is_none() ||
-       context.tracks[track_index].track_id.is_none() {
-        return MP4PARSE_ERROR_INVALID;
+    let track = &context.tracks[track_index];
+
+    if let (Some(track_timescale),
+            Some(context_timescale),
+            Some(track_duration)) = (track.timescale,
+                                     context.timescale,
+                                     track.duration) {
+        info.media_time = track.media_time.map_or(0, |media_time| {
+            track_time_to_ms(media_time, track_timescale) as i64
+        }) - track.empty_duration.map_or(0, |empty_duration| {
+            media_time_to_ms(empty_duration, context_timescale) as i64
+        });
+
+        info.duration = track_time_to_ms(track_duration, track_timescale);
+    } else {
+        return MP4PARSE_ERROR_INVALID
     }
 
-    let track = &context.tracks[track_index];
-    info.media_time = track.media_time.map_or(0, |media_time| {
-        track_time_to_ms(media_time, track.timescale.unwrap()) as i64
-    }) - track.empty_duration.map_or(0, |empty_duration| {
-        media_time_to_ms(empty_duration, context.timescale.unwrap()) as i64
-    });
-    info.duration = track_time_to_ms(track.duration.unwrap(), track.timescale.unwrap());
-    info.track_id = track.track_id.unwrap();
+    info.track_id = match track.track_id {
+        Some(track_id) => track_id,
+        None => return MP4PARSE_ERROR_INVALID,
+    };
 
     MP4PARSE_OK
 }
@@ -438,6 +460,32 @@ pub unsafe extern fn mp4parse_get_track_video_info(parser: *mut mp4parse_parser,
     MP4PARSE_OK
 }
 
+// A fragmented file needs mvex table and contains no data in stts, stsc, and stco boxes.
+#[no_mangle]
+pub unsafe extern fn mp4parse_is_fragmented(parser: *mut mp4parse_parser, track_id: u32, fragmented: *mut u8) -> mp4parse_error {
+    if parser.is_null() || (*parser).poisoned() {
+        return MP4PARSE_ERROR_BADARG;
+    }
+
+    let context = (*parser).context_mut();
+    let tracks = &context.tracks;
+    (*fragmented) = false as u8;
+
+    if !context.has_mvex {
+        return MP4PARSE_OK;
+    }
+
+    // check sample tables.
+    let mut iter = tracks.iter();
+    match iter.find(|track| track.track_id == Some(track_id)) {
+        Some(track) if track.empty_sample_boxes.all_empty() => (*fragmented) = true as u8,
+        Some(_) => {},
+        None => return MP4PARSE_ERROR_BADARG,
+    }
+
+    MP4PARSE_OK
+}
+
 #[cfg(test)]
 extern fn panic_read(_: *mut u8, _: usize, _: *mut std::os::raw::c_void) -> isize {
     panic!("panic_read shouldn't be called in these tests");
@@ -614,7 +662,7 @@ fn get_track_count_poisoned_parser() {
 #[test]
 fn arg_validation_with_data() {
     unsafe {
-        let mut file = std::fs::File::open("examples/minimal.mp4").unwrap();
+        let mut file = std::fs::File::open("../mp4parse/tests/minimal.mp4").unwrap();
         let io = mp4parse_io { read: valid_read,
                                userdata: &mut file as *mut _ as *mut std::os::raw::c_void };
         let parser = mp4parse_new(&io);
diff --git a/toolkit/library/rust/Cargo.lock b/toolkit/library/rust/Cargo.lock
index 2aed7cfa336e..0052f7300a3c 100644
--- a/toolkit/library/rust/Cargo.lock
+++ b/toolkit/library/rust/Cargo.lock
@@ -2,7 +2,7 @@
 name = "gkrust"
 version = "0.1.0"
 dependencies = [
- "mp4parse 0.4.0",
+ "mp4parse_capi 0.5.0",
 ]
 
 [[package]]
@@ -11,8 +11,15 @@ version = "0.5.3"
 
 [[package]]
 name = "mp4parse"
-version = "0.4.0"
+version = "0.5.0"
 dependencies = [
  "byteorder 0.5.3",
 ]
 
+[[package]]
+name = "mp4parse_capi"
+version = "0.5.0"
+dependencies = [
+ "mp4parse 0.5.0",
+]
+
diff --git a/toolkit/library/rust/Cargo.toml b/toolkit/library/rust/Cargo.toml
index 48c77f853aeb..81583c4d2212 100644
--- a/toolkit/library/rust/Cargo.toml
+++ b/toolkit/library/rust/Cargo.toml
@@ -6,7 +6,7 @@ license = "MPL-2.0"
 description = "Rust code for libxul"
 
 [dependencies]
-mp4parse = { path = "../../../media/libstagefright/binding/mp4parse" }
+mp4parse_capi = { path = "../../../media/libstagefright/binding/mp4parse_capi" }
 
 [lib]
 path = "lib.rs"
diff --git a/toolkit/library/rust/lib.rs b/toolkit/library/rust/lib.rs
index 22eba26d9e70..5f5141050e95 100644
--- a/toolkit/library/rust/lib.rs
+++ b/toolkit/library/rust/lib.rs
@@ -2,4 +2,4 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-extern crate mp4parse;
+extern crate mp4parse_capi;