MP4 specifically refers to the MPEG-4 part 14. A standard audio and video container that is part of the MPEG-4 specification developed by ISO / IEC.

learn more… | top users | synonyms

0
votes
1answer
2k views

Sound out of sync after merging multiple mp4 files with Avidemux

I am trying to join (merge) two or more .mp4 files together, without re-encoding. Here is what I did: Started Avidemux 2.5.5. With File->Open, selected Input1.mp4. I received this message - "H.264 ...
26
votes
1answer
18k views

FFMPEG Splitting MP4 with Same Quality

I have one large MP4 file. I am attempting to split it into smaller files. ffmpeg -i largefile.mp4 -sameq -ss 00:00:00 -t 00:50:00 smallfile.mp4 I thought using -sameq would keep the same quality ...
0
votes
1answer
29 views

Play mp4 video in Internet Explorer 11 with security level set to high

I am using the html5 tag to embed mp4 videos on a site. They play well in all browsers except on IE-11 but only when the security level is set to high (if security level downgrade to medium video ...
0
votes
0answers
38 views

Getting an mp4 to play on iOS Safari with ffmpeg

I have a script that cuts and splices some video from youtube with ffmpeg to make an mpeg thumbnail. The final result is an mp4 that runs fine with the HTML <video> tag on Mac OSX Safari, ...
2
votes
2answers
2k views

What's the easiest way to save a GIFV as a simple GIF?

Usually I open the context menu right clicking on the image. Now theres no option for "save image as", just options for the WEBM/MP4 format.
-1
votes
0answers
13 views

How do I convert pvr to mp4?

I have TV box called GTPL for Channel subscription. In that there is a facility to record the show. But it saves the video in "pvr" format that I can't play it in the computer or any other device? So ...
0
votes
2answers
266 views

Concatinating mp4 files to a single mp4 file

I have some mp4 video files with me and i need to concatenate them one by one and make a single MP4 video file. I came to know about FFMPEG through which we can concat files. I tried doing ffmpeg ...
2
votes
0answers
21 views

Any empirical length limits or caveats about MP4's of 7400 seconds?

I was investigating a curious issue I have with the playback of certain MP4 files on my BluRay player; in particular, it seemed files over two hours simply would not play (player locked up). As I ...
1
vote
1answer
23 views

any one have a workaround in Linux for firefox's bogus “video can't be played because the file is corrupt” message

Systems are Xubuntu 14.04.2, 64-bit running (currently) Firefox 37.0.2 (provided by Canonical). attempts with firefox to open training videos by clicking on the website-provided links at (e.g.) ...
3
votes
1answer
3k views

How do I merge a folder of PNG images to a mp4 movie using avconv?

I have a folder containing many time stamped PNG images which I'd like to merge to a short movie. The contents of that directory looks like this: └── images ├── img_20130421_115547.png ├── ...
0
votes
0answers
13 views

Issues streaming movies with VLC from my debian server

I am trying to stream movies from my linux server that I connect to via SSH. I go to VLC and networking and I use SFTP to get to my server and my file. ...
0
votes
1answer
23 views

How do I use command line to make an mp3 file an Mp4 file with visualisations? Is it possible to batch convert a folder with MP3's into videos?

I have a folder filled with mp3 files. I would like to render them as mp4 video files with music visualisations - is there a way to do this though command line?
4
votes
1answer
7k views

ffmpeg: Could not find codec parameters for stream 0 (Video: h264) unspecified size

I try to convert a video from .raw to .mp4. For this reason I did download, build and install both x264 and ffmpeg. However, command: ffmpeg -f h264 -i output.raw -vcodec copy output.mp4 fails with ...
0
votes
1answer
100 views

.MKV to .MP4 with 2 soundtrack (audio)

I found this thread: Handbrake settings to convert MKV to MP4 while retaining the original quality And I can "convert" .MKV to .MP4 with the following code: for %%a in ("*.mkv") do ...
35
votes
8answers
133k views

How can I merge two mp4 files without losing quality?

I have two high-quality mp4 files, which are of two parts of the same show. I want to merge them together into 1 file, and I usually use VirtualDub to merge my files... But it doesn't seem to support ...
0
votes
0answers
102 views

FFMPEG concat demuxer — how to make mp4 file formats compatible

I need to automate mp4 concatenation server-side and I'm using FFMPEG. I will get uploads of mp4 files and I want to attach a Title.mp4 and End.mp4 to each one. I am also overlaying a soundtrack (the ...
0
votes
0answers
17 views

Sony Vegas MP4 video file plays only bugged audio

I have a youtube intro, it works in every video player (VLC, WMP) and the mp4 itself renders correctly when uploaded to youtuve but it doesn't work when I import it to vegas, which is it's intended ...
-1
votes
1answer
38 views

Turn MP4 into an animated GIF [duplicate]

Not sure if this a specific photoshop related issue or if there's another workaround but I have a 5 second MP4 file which has 5 or 6 multiple photos stitched together, is there a way of turning it ...
0
votes
1answer
51 views

MKV to MP4 with hardcoded subs (how can I delay subtitles?)

I read on another question here on superuser that for converting from MKV to MP4 and hardcoding subs i have to use mkvextract and avidemux, i tried to do it, and basically it worked but... the ...
0
votes
1answer
106 views

ffmpeg to split mp4 file into segments… after first segment, audio unsynced

Nb: I incorrectly asked this question at stackoverflow I've used the ffmpeg command line shown in this question to split MKV files perfectly for a long time. Now i have some MP4 files that i'd like ...
-2
votes
3answers
432 views

Conversion from WebM to MP4 in Ubuntu is slow and bad quality

I have used the command ffmpeg -i input.webm -q:v 10 -c:a copy out.mp4 I also tried using avconv instead of ffmpeg. The conversion is successful but the quality is bad. Also it takes a lot of ...
0
votes
0answers
54 views

Editing metadata of H.264 MP4 videos

Windows lets me edit some metadata fields of H.264 encoded videos, such as “Title” and “Comments.” Such data seem to be preserved inside the file itself, which is what I want. Some applications make ...
2
votes
1answer
943 views

MP4 takes too long to start

I'm converting my video to H.264 / MP4 with ffmpeg. I then move the moov atom to the start of the file with qt-faststart, so I can stream the video. Everything works fine with small videos of 5–10 ...
22
votes
6answers
23k views

FFMPEG convert flv to mp4 without losing quality [duplicate]

Currently I'm converting .flv flash files to .webm and .mp4 files to be used with an HTML5 video player. _ I use this ffmpeg command for WEBM: ffmpeg -i filename.flv -vcodec libvpx -acodec libvorbis ...
2
votes
2answers
4k views

Problems with frame rate on video conversion using ffmpeg with libx264

I have problems with transcoding some videos. I ran the most simple ffmpeg command and it takes very long time and the output file is about 10 times bigger. If I provide the frame rate parameter -r it ...
8
votes
3answers
511 views

How to convert .avi video that has 1 static image in the video (with sound) to mp4 video with ffmpeg to least possible size?

I've an .avi video (divx) that's at 25fps and it has mp3 audio at 64kbit/s. This video has just one image throughout the entire video. I'm trying to convert this video to mp4 but to make it as small ...
-2
votes
3answers
85 views

MP4 files I download look pale and have colors misplaced [closed]

Ok, first things first: here's a screenshot from a recap I've downloaded. I guess if Neil Patrick Harris would host the ceremony back in 70s it'd look like that. There's this obvious offset of the ...
1
vote
3answers
24k views

Which is better between a .flv and a .mp4 video files with same encoding?

There is a server from which I can download videos, and I can choose if I want .flv or .mp4. The encoding is the same: -> FLV Flash Video 1 video stream: 640*360 (16:9), at 25,000 fps, AVC ...
5
votes
1answer
713 views

Not able to play a mp4 video purchased from Google Play

I purchased a movie from Google Play, then used Ant Video Player to download it. It's in MP4 format (or, at least, has an MP4 extension). When I try to open it in Windows Media Player, I get the error ...
-1
votes
1answer
118 views

FFMPEG conversion from webm to mp4 intermittent on Ubuntu 14.04 [duplicate]

I am trying to convert .webm file that we get from google's screencastify to .mp4 file. I need it to be playable using Windows Media Player. I need it the file to be playing with all the WMP versions ...
1
vote
1answer
467 views

Player for playing .mp4sub files

I have just downloaded a bunch of .mp4 files, which are accompanied by .mp4sub files. There are exactly three .mp4sub (named b, c and d) files for each .mp4 (named a). Example pattern: a_Astra.mp4, ...
15
votes
3answers
77k views

How do I create a DVD from an MP4 file using Windows DVD Maker?

I'm trying to create a DVD from an MP4 file using Windows DVD Maker (on Windows 7) but when doing so I get the error that the file type is not supported and cannot be imported. What is the easiest way ...
1
vote
1answer
2k views

How can I rotate MOV and mp4 files in Windows Live Photo Gallery?

I am using Windows Live Photo Gallery on Windows 7 to manage my photos and video clips from camera/phone. If I import photos/videos from camera, it is smart enough to rotate as necessary, but I have ...
17
votes
3answers
33k views

How to open and repair an m4v or mp4 video file?

Yesterday I was filming a scene with my phone but suddenly the application crashed and when I try to open the m4v generated it says that is corrupted. I have downloaded the video files (around 36MB) ...
9
votes
1answer
5k views

Accurately cut video files from command line

I'm having trouble finding a cli application that can take a video file (avi, mkv, and mp4 preferably) and cut out very short clips (2-6 seconds) with precision time accuracy. I've tried ffmpeg, ...
2
votes
1answer
147 views

Remux/encode/convert MPG into MP4

I understand that it is impossible to edit metadata of MPG files (i.e. createdate), so I am looking for another way to "upgrade" my MPGs into a newer file format (preferred are formats that work both ...
12
votes
4answers
4k views

How can I remove multiple segments from a video using FFmpeg?

I am trying to delete a few sections of a video using FFmpeg. For example, imagine if you recorded a show on television and wanted to cut out the commercials. This is simple with a GUI video-editor; ...
1
vote
1answer
78 views

Saving .mp4 audio file as an mp3 file [closed]

If you were to save a .jpeg image as an .png image by simply changing the file extension, the image will successfully convert itself. Is there a way similar to this where I can save an .mp4 audio ...
0
votes
0answers
25 views

What parameters for lightweight HTML5 video with avconv? [duplicate]

I have this: avconv version 0.8.16-6:0.8.16-1, Copyright (c) 2000-2014 the Libav developers built on Sep 16 2014 23:10:48 with gcc 4.7.2 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'film.mp4': ...
0
votes
1answer
211 views

Converting DVD subtitles to text

I want to convert image-based subtitles (dvd_subtitle) to text-based subtitles (mov_text). I'm on OS X and would strongly prefer to use a free command-line based tool. My source data is either a DVD ...
2
votes
1answer
2k 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 ...
-3
votes
3answers
105 views

How can I convert M4V video to MP4 format under my Windows 7? [closed]

I want to convert M4V videos to MP4 format format to play on my Android Tablet. Is there any recommended app for Windows computer?
0
votes
0answers
86 views

How to recover at least audio from broken recorded skype stream file?

I used "Free Video Call Recorder for Skype - DVDVideoSoft" to record an audio-video stream at skype conversation, but mp4 file got broken somehow, because I can not open it with any media player. I ...
28
votes
10answers
47k views

How to convert WMV to MP4?

How can a set of WMV files be converted to MP4 so I can import them to my Apple TV?
12
votes
1answer
8k views

Streaming mp4 with ffmpeg

I need to create a feed that has two streams - webm and mp4 - so that it can be compatible on all HTML5 video players. The webm stream works perfectly. However, when trying to access the mp4 stream, ...
13
votes
2answers
6k views

FFMPEG - Non-monotonous DTS

When I use FFMPEG to convert a video from MP4 to M3U8, using the following command, ffmpeg -i op.mp4 -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 ...
1
vote
1answer
255 views

Swapping index of an MP4 file with FFMpeg

I run a web application which provides a few videos on it. Those videos are being displayed with a flash-video-player. Unfortunately, the index of those container-files is at the end of the file, so ...
5
votes
2answers
8k views

Why is converting WMV to MP4 so slow?

I am trying to convert a video from WMV to MP4 with FFmpeg but it takes couple of hours. If I try to convert it to AVI it only takes about 10-15 minutes. ffmpeg version ffmpeg version ...
2
votes
1answer
763 views

Which FFmpeg command do I use to passthrough FLV to MP4?

I've a number of downloaded FLV files which I would like to convert to MP4. They are already in the correct format so I am told all I need to do is to remux the video and audio streams into an MP4 ...
0
votes
1answer
373 views

ffmpeg trying to hardcode subs using -c:s mov_text but fails

Please bear with me; I'm still learning the intricacies of ffmpeg and have hit a problem with subtitles. So, I am trying to change the container of a video from mkv to mp4, and simultaneously ...