Questions tagged [mp4box]

Used for questions related to the manipulation of ISOBMFF files (aka MP4 files) with GPAC MP4Box tool. Please provide mp4box version when asking for help.

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MP4Box: Select track by type and language?

For a directory of MP4 files, I want to bulk-change their subtitle tracks that are currently tagged as English en to English (United States) en-US. Is there a way to select subtitle tracks by current ...
Vivian's user avatar
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0 votes
3 answers
128 views

How do I extract a subtitle track from an MP4 file in a usable format?

I have an MP4 file containing a subtitle track. When I extract it using MP4Box -raw 3:output=track3 myfile.mp4 I get a .tx3g file - a semi-binary format. My subtitle editors don't support it, and I ...
einpoklum's user avatar
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399 views

Set the default Audio track and Subtitle Track with MP4Box

I was recently remuxing some multilingual MP4s and I noticed that in the original audio track, most media players will recognize an audio stream as having some kind of "default" flag, they ...
Ecksters's user avatar
  • 145
1 vote
2 answers
883 views

Audio Conversion through change of file extension (E-AC3)

Not sure if this i the right place to ask my question but I'll give it a go. I extracted an E-AC3 Audio track with MKVExtractGUI. The output file I get was .eac3. Another tool I used says it supports ...
AlphaInc.'s user avatar
  • 179
1 vote
2 answers
333 views

GPAC MP4Box fullrange flag

A few years ago I was trying to encode some GoPro videos with Handbrake to reduce their file size and store them. After a few attempts, I noticed that the colors on the encoded videos were looking a ...
Theo S's user avatar
  • 21
3 votes
2 answers
2k views

How to use ffmpeg to programatically remove video streams?

So, I'm trying to refactor some old code that should remove video streams, compress the audio stream and repack the mp4, which should be a video file with only an audio stream. I later intend to ...
Fabio Freitas's user avatar
3 votes
3 answers
27k views

Using FFMPEG with Nvidia GPU

I have approximately 1400 .mp4 video files, and I must reencode everything to use mp4box to transform it in DASH CPU: Intel® Core™ i7-6700 Quad-Core Skylake GPU: GeForce® GTX 1080 Ram: 64GB Ubuntu 18....
darox's user avatar
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0 votes
1 answer
1k views

Generate mpeg-dash segments and mpd file using transport stream buffer

I am receiving mpeg-2 transport stream on a buffer and i need to serve the content using HTTP to a web view. I'm planning to implement it using the mpeg-dash specification and a simple HTTP server. ...
Ishaan Shringi's user avatar
1 vote
1 answer
2k views

Why is FFmpeg video splitting of 595-600 seconds slow compared to 0-5 seconds? [duplicate]

I have to split a 4K 10 minutes video into 120 small video files, each containing 5 seconds of duration. I'm using ffmpeg for splitting the video. The splitting take a very very long time and the ...
aman's user avatar
  • 113
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1 answer
260 views

"-tmp" parameter of MP4Box needs 2 backslashes

I'm on Windows 7 Ultimate SP1 x64, running MP4Box - GPAC version 0.7.2-DEV-rev357-g7115eeb8-master. I've created a BAT file like this : mp4box -add %1#trackID=1:name= -add %2#trackID=1:name= -tmp "%~...
Derp's user avatar
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3 votes
0 answers
565 views

delay in audio sync after converting ac3 to aac

I have a MKV video consist of a video and an audio of duration 10 minutes, after using ffmpeg to extract ac3 to aac audio, its duration became 10:50, which lead to audio out of sync with the video ...
samer metwally's user avatar
2 votes
0 answers
616 views

MPEG-DASH stream never choosing representation with lowest bandwidth

I've converted an mp4 file into four mp4s using ffmpeg: three video-only files of low, medium and high quality, and one with only audio. I then converted these into an MPEG-DASH using MP4Box and ...
Shiraz Butt's user avatar
0 votes
1 answer
53 views

linux avconv: how to extract a parameter sceme to create new video?

I have different video files, clips. Some are mp4, m4v, flv... withdifferent rates orI don't know which differences more. The point is, I want to merge files, which I created from input files with ...
Linuxwhisperer's user avatar
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0 answers
131 views

AtomicParsley - Get STCO Entries only

So I want AtomicParsley to list all of the STCO entries instead of showing something like this Atom ftyp @ 0 of size: 32, ends @ 32 Atom free @ 32 of size: 8, ends @ 40 Atom mdat @ 40 of size: ...
Dinindu Perera's user avatar
1 vote
1 answer
3k views

Merging audio and video files of different length using mp4box

I have to merge video and audio file together. Currently I am using this command mp4box -flat -add <video> -add <audio> <outputfile>.mp4 But the problem is, if the video is of say ...
Sourabh's user avatar
  • 133
3 votes
1 answer
5k views

How to merge MP4 files with different bitrates?

I want to merge two or three MP4 videos with MPEG-4 AVC video codec and MP3 (sometimes MP3 Surround) audio codecs. Both audio and video can have different bitrate. If it will be possible, without ...
Jakub's user avatar
  • 130
0 votes
1 answer
9k views

Missing reference frame, slice header decode error

I split this (http://www.auby.no/files/video_tests/h264_720p_mp_3.1_3mbps_aac_shrinkage.mp4) video using mp4box command "MP4Box -split 1 shrinking.mp4" into slices of 1 second each. I have following ...
AnilJ's user avatar
  • 103
3 votes
1 answer
6k views

ffmpeg - concatenating two MP4 files results in bad output file

I generated two MP4 files - a five-second intro file, which is created by the script below, and the main video (about one minute long) is created by screen-cast-omatic, both in MP4 format. When I ...
DevDewboy's user avatar
0 votes
1 answer
2k views

MP4Box and concatenating files with different aspect ratio

I have a large directory of small video clips taken with a cell phone. I've been able to use mp4box to concatenate them into a single file nicely EXCEPT if they are different aspect ratio. In this ...
awl's user avatar
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2 votes
1 answer
8k views

How can I extract tags from a MP4 file with MP4Box or mediainfo on the command line

I want to extract tag information like title, author, encoded date, tagged date and so on from several video, audio and subtitle tracks in .mp4 files (for later use in mkvmerge). I need the extracted ...
Endoro's user avatar
  • 2,914
0 votes
1 answer
3k views

MP4Box h264 merge video files

I combine video with mp4box. Merge video corrupted.The first video correctly but others are corrupt. Sound properly, the video is corrupted. I know very little english :) Sorry... MP4Box merge code: ...
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0 votes
1 answer
2k views

How can I run a command on every file in a given directory?

I am using mp4box to move the MOOV atoms on MP4 files. The thing is, I will have 6 files in a given folder and I don't want to run the inter 500 command six separate times. Is it possible to do ...
usr122212's user avatar
  • 103
2 votes
0 answers
669 views

Prepend AAC file to MP4 causing audio to get out of sync

I have an application that handles the normalizing and combining of audio and video files from many different sources. All incoming audio is normalized as follows: ffmpeg.exe -i "...
Bill Bonar's user avatar
0 votes
1 answer
1k views

Windows Explorer not showing film frame for .mp4

Anyone knows what part of registry is related to this film frame? I installed and uninstalled mp4box, avidemux, YAMB try to set default aspect ratios but failed, and now I have a new problem.
hgajshb's user avatar
  • 485
1 vote
1 answer
2k views

Merging h264/MP4 files with mp4box results in seeking and sync issues

I've a problem while merging two h.264/MP4 files with the same parameters except length. I'm merging by mp4box -cat .... After that, video players behave strangely: If I drag time slider closer to ...
user avatar
1 vote
1 answer
2k views

MP4 re-ecoding to guarantee concatenation without re-encoding

I have 2 mp4 videos that fail to concatenate when using: MP4Box -add 1.mp4 -cat 2.mp4 out.mp4 Is there a way to re-encode 2.mp4 so that the concat call will create a valid output? Possibly with ...
Scrooch's user avatar
  • 111
52 votes
2 answers
117k views

How to extract subtitles from MP4 and MKV movies

I'm trying to extract subtitles from MP4 and MKV movies. I'm using mp4box (on OS X) but cannot figure out how it works. Any hints?
Open the way's user avatar
  • 8,563
3 votes
6 answers
952 views

Downloading, Re-encoding, and Joining YouTube Videos

I've downloaded a set of Youtube Videos that are part of the same episode. Currently I've tried converting them into mp4 using ffmpeg and then joining with MP4Box. for f in *.flv; do ffmpeg -i "$f" -...
James Smith's user avatar
0 votes
2 answers
4k views

Why does my mp4 (h.264) need mp4box all the time?

Whenever I convert a video into mp4 with h.264 codec, it doesn't play immediately on Windows or iPad. It plays fine when I convert the video with mp4box. I use the following command to convert. ...
user45326's user avatar
  • 2,023
16 votes
4 answers
26k views

Extract audio aac from mp4

Is there a command line tool for Windows to extract audio aac from mp4 ?
iceman's user avatar
  • 2,452
0 votes
1 answer
2k views

Merging two m4v videos into one

I'm trying to merge two m4v video files into one with mp4box, and failing :( Here's what mp4box -info reports for first file * Movie Info * Timescale 90000 - Duration 01:06:18.836 ...
Paul Dixon's user avatar