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.

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Why does Google Chrome automatically play MP4 videos (and is that a good thing?)

I am working on a home media server running nginx. I navigated to one of the .mp4 files I have to test it and it started streaming just by clicking on it. Is this... performance-wise... the best ...
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29 views

FFMPEG / x264: Single pass: how do you raise start time bitrates?

When using single-pass mode with a VBV size specified, libx264 will initially "sandbag" the bitrate, presumably due to lack of evidence (or perhaps even a bug). (This is an ironic followup to this ...
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1answer
24 views

FFMpeg image sequence to video using VP9 encoder

I'm trying to transcode mp4 to webm format in a lossless way. I tried two ways to do that. For that purpose, I extracted mp4 video to image sequences (png). Then, I converted image sequence(without ...
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1answer
33 views

How do I transcode/compress mp4 source files on the Linux command line?

I have some rather large mp4s produced by my phone. They aren't very long, so they're probably not very compressed. What's an example of using a command line Linux tool to transcode one of these to ...
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1answer
32 views

convert mp4 video file to any video file, playable in windows media player by VLC media player

I have some mp4 video files that are created by KAZAM. But I need to play those files on Microsoft Windows only by Windows Media Player (I can not install for example VLC media player). Also I can not ...
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22 views

Which audio tracks should a mp4 file have?

I am converting some of my DVDs to mp4 files with handbrake for watching them on my computer and am a newbie to video conversion. I read a bit about the topic on the internet, but am confused about ...
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1answer
39 views

QuickTime can't play mp4 generated by ffmpeg without converting first

I've created a .mkv file from a DVD using MakeMKV that I've then converted to .mp4 using ffmpeg: ffmpeg -i title00.mkv -c copy -c:s copy output.mp4 Now when I try opening the .mp4 file using ...
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1answer
30 views

Upload to youtube and keep all mp4 settings

Is it possible to create an mp4 in such a way that youtube will more or less leave it alone when uploaded? I.E. I want to upload a file to youtube, and then re-download it later using a firefox plugin ...
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25 views

How can I edit Android-grabbed MP4 files in Virtualdub?

Android's command adb shell screenrecord x.mp4 is supposed to produce MPEG-4 files. VirtualDub is supposed to support MPEG-4 files through the use of the FFInputDriver plugin. The latter is true ...
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1answer
46 views

Since you can't write FFMpeg to stdout with flv to mp4 is there a workaround?

I've been trying for a while to figure out a way in which I can have FFMpeg input a flv url and output to stdout mp4. Apparently mp4 requires to read the size of the file to fully work. Is there a ...
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1answer
54 views

OpenSUSE ffmpeg mp4 output

I keep getting the following error when I try to output an mp4 file with ffmpeg on OpenSUSE 42.1: [NULL @ 0x7f2ef400b580] Requested output format 'mp4' is not a suitable output format Is there ...
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1answer
33 views

Color variations when playing video files through media players

I am a Software Engineer and using a HP ProBook 4540s laptop. I have installed windows 8.1 (64-bit) for myself and all the drivers are up-to-date. When I play video files (I checked *.mp4 and *.wmv ...
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1answer
431 views

How To Convert Offline files downloaded from Lynda.com

As a premium member you can download course video files from Lynda.com. I have downloaded files for the courses that I have completed. The files in reside in the respective folder and have a .Lynda ...
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1answer
50 views

asterisk 11.7 with app_mp4 for playing mp4 videos

I have successfully compiled and run app_mp4 for asterisk 11.7 and recording audio/video with MP4Save. I am using ulaw as audio codec and h263 (simple h263 not 1998 or 2000) video codec. Although I ...
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22 views

changing MP3 and MP4 default program

When I choose default program for opening MP3 files, it automatically changes for MP4 too. Also vice versa, when I choose default program for MP4 it changes it automatically for MP3 too. This is ...
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49 views

On Windows; x264 [error]: not compiled with MP4 output support

I am using x264 official built from this page. I run the application as follows: x264 --pass 1 --bitrate 1000 -o output.mp4 input.vob --profile high But it gives me following error: x264 ...
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46 views

Capturing RTMP stream and save as MP4

I am trying to capture the following RTMP stream, how would I go about it? jwplayer("flvplayer").setup({ file: "90/4433568122_n.mp4?h=grfo7we4k7xzjz2z55gearri7zotzl6rs2hasvfb4vntwftczres3lizpq", ...
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0answers
58 views

H.265 and Opus in Mp4 container - is it possible?

I have an MKV file with HEVC video and OPUS audio. It plays great in all players. The problem is that I need it to be streamable. When VLC plays an MKV from the web, it first downloads it and then ...
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0answers
62 views

ffmpeg-concatenating two or more mp4 videos does not give bad output video

I am joining two or more videos using ffmpeg : ffmpeg -f concat -i mylist.txt -c copy vidname.mp4 mylist.txt file contains enteries: file '1.mp4' file '2.mp4' both videos are of same frame rate ...
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64 views

How to manually add and edit metadata in a mp4 file

I need to edit/add metadata in a mp4 file, I know their are applications to do this for me, but they are all quite slow. I have looked up how the metadata is stored but there are no clear answers on ...
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83 views

Split MP4 video with chapters into seperate files

I´ve got a few videos which I already converted (with HandBrake) into m4v (ready for iOS devices - sources are deleted) each 2,5 hours long with chapter marks and I want to cut them into seperate ...
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43 views

Cannot find the audio bitrate of FLV video

I use ffprobe to get info about video, which i can use for encoding to mp4. And recently i faced with the issue. The issue is input video has audio, but output video is mute. I used php script to get ...
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66 views

Video is choppy but audio is fine (Windows 10)

I recently recorded my computer playing a full screen video for around 3.5 hours. I then restarted my computer and went to play it back. The audio is fine and runs smoothly, there is no issue. The ...
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3answers
369 views

FFMPEG: convert MP4 to same MP4 (in a different container) and add Subtitles

The main reason for this post is that I have movie.mp4 that I have downloaded an SRT for. When I manually add the SRT VLC uses its settings to change the font/size etc of the SRT. But if I Embed the ...
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1answer
257 views

In ffmpeg, how to delay only the audio of a .mp4 video without converting the audio?

In my .mp4 file the audio delay is -3840 ms. I synced it in KMplayer, and I don't want to use MKVGUI to make a .mkv file. I just need to delay the audio by -3840 ms, everything else intact. What would ...
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1answer
2k views

Why isn't this video player on my Firefox?

The video on this webpage works on my tablet's and a 2nd computer's Firefox browsers, but not on my main computer's Firefox. Tablet: Android 5.0, Firefox 39 2nd PC: Windows 7 x86, Firefox 40.0.3 ...
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416 views

using ffmpeg to repair corrupted MP4 video files from Xiaomi Yi

did not know wether to create a new thread or to post in an existing one. Decided for the first option, as my case seems to be a little different as I do not have one video corrupted but plenty of ...
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51 views

Which audio codec is preferable to use for mp4 video?

I use standart codec for encoding and i don't like the quality of audio even if there is larger audio bitrate. ffmpeg -y -i input.avi -i watermark.png -filter_complex ...
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72 views

Sony Vegas: Will re-rendering a video with identical video encoding reduce quality?

I have edited and exported a video in Sony Vegas Pro 13 using the preset 1920x1080-30p video template (mp4, AVC, 16 Mbps). However, I need to reedit the audio of the video, and would like to know if ...
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2answers
178 views

How do I view the duration of MP4 files in Explorer on XP?

When displaying the Duration column in a folder window with MP4 videos, it is blank. I am aware that there is no native support for this filetype in Windows XP. This answer is related, but only gives ...
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9 views

how to batch convert MP4 files to dvd format (video_ts) [duplicate]

Does anyone know how I can convert (several hundred) MP4 files TO DVD format (video_ts and audio_ts files), and preferably then have them in iso files ready for burning? I have googled and can only ...
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60 views

Not able to play a large media file in Quicktime

I am testing a video domain bug, the case is I have a large .mp4 recording 7.5GB, I am able to play it in VLC player and also in Windows Media player but when I play it with Quicktime player it throws ...
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1answer
713 views

How to extract and merge hard-coded subtitle in a video

I downloaded a movie that has hard-coded subtitles, for some reason I don't like the font of the subtitles :P . But since it's hard-coded inside the movie, I can't extract the subtitle with MkvExtract ...
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57 views

How to attach an intro mp4 to multiple mp4 files in a folder?

I have an intro video (mp4) that I'd like to attach to multiple mp4 videos in a folder. I use windows and ffmpeg. How would I code this in the cmd? If I have to use another program that's fine, I ...
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2answers
193 views

How to convert multiple mp3 files to mp4 with ffmpeg?

The following command takes the mp3, attaches an image to it, and converts it to an mp4: ffmpeg -i input.mp3 -loop 1 -i image.png -c:a copy -c:v libx264 -shortest output.mp4 I'm trying to apply the ...
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votes
2answers
109 views

How do I convert multiple mp3 files to mp4 with ffmpeg?

The following command takes the mp3, attaches an image to it, and converts it to an mp4: ffmpeg -i input.mp3 -loop 1 -i image.png -c:a copy -c:v libx264 -shortest output.mp4 I need to do this for ...
1
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2answers
197 views

ffmpeg hardsubbing ass file into mp4

I am unable to hardsub a subtitle file into a mp4 file. The code that I used (which seems to work once or twice) is: ffmpeg -i "videofile" -vf "ass=assfile" -scodec copy "outputfile" As I ...
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1answer
125 views

How can I edit video (specifically mp4) metadata?

I have a few video files that are 1080p video files, but for some reason, they don't have any metadata for bitrates (audio, video, or total) or anything like that. I first noticed this when I looked ...
0
votes
2answers
239 views

ffmpeg for Mac “no such file or directory” (when file exists)

I'm using OSX 10.10.1 and I'm trying to concatenate .mp4 files with the ffmpeg demuxer. Below is what I enter and the error I get. Please help! I'm not a programmer but I had the demuxer working on my ...
2
votes
1answer
52 views

Does ffmpeg support setting the description tag on a per-stream basis?

I'm attempting to set a description tag for each of two audio streams within an mp4 file. I'm using a command line similar to this (I've simplified): ffmpeg -i old_movie.mp4 -map 0:0 -c:v copy -map ...
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1answer
2k 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 ...
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297 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
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0answers
48 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 ...
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1answer
221 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.) ...
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212 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. ...
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1answer
512 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?
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1answer
560 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 ...
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457 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 ...
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0answers
84 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 ...
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1answer
231 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 ...