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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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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2answers
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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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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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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, ...
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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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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 ├── ...
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4answers
4k views

Software to speed up playback of mp4 files

I'm trying to speed up the playback of mp4 video files. I'm able to speed-up playback on Windows using VLC but I'd like to convert the file so it will always play 1.25 faster than normal speed ...
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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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1answer
4k views

Rotate MP4, and change dimensions

I have an MP4 video that was filmed on my Android phone, but the guy filmed it holding my phone some weird way. When viewing it in QuickTime I have to rotate my laptop 90 degrees and then I will see ...
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2answers
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Shouldn't we always use Web Optimized for Handbrake?

I use Handbrake sometimes to compress video files, and notice that the "Web Optimized" option is not chosen by default, and cannot be set to the default in Options either. But I tried both Web ...
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0answers
35 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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6answers
28k 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 ...
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1answer
50 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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1answer
2k views

How to merge MP4 files with different frame rates and different audio sample rates

I have four MP4 files called "file_1", "file_2", "file_3" and "file_4" and I wish to merge them into one file in the following order: file_1, file_2, file_3 and file_4. file_1 has the following ...
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4answers
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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 ...
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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 ...
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42 views

Issues with audio when converting video with ffmpeg

It's an uncommon issue, it occurs when an input video file is low quality, exactly input audio stream. I use aac native with 64k bitrate in conversion command. Do i need to use other audio codec or ...
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2answers
1k views

How should I encode a fully working H.264 video for Flash player?

I did some homework: It seems that I should use a command like ffmpeg -i input.mp4 -vcodec libx264 -g 1 -r 25 output.mp4 but this did not work: the output.mp4 can not jump to other seekpoints ...
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2answers
76 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 ...
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2answers
67 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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2answers
173 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 ...
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2answers
47 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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37 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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693 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 ...
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2answers
50 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 ...
28
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9answers
50k 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?
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1answer
3k views

“windows media player cannot play the file” mp4

We have an .mp4 video hosted on a web site. I can play back the video from the production version of the web site, but not the test version of the site. The production web site has the .mp4 MIME ...
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0answers
18 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 ...
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4answers
38k 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) ...
26
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1answer
19k 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 ...
19
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1answer
40k views

Converting FLV to MP4 Using FFMPEG and Preserving the Quality

Im trying to use ffmpeg to convert my flv files to mp4 to play them on iOS devices but the converted video has a much worse quality than the original one. Here is the command i use: ffmpeg -i ...
2
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1answer
24 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 ...
2
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1answer
9k views

Use ffmpeg copy codec to combine *.ts files into a single mp4

I've got a bunch of ts segments described by a single index.m3u8 file: index.m3u8 segment1_0_av.ts segment2_0_av.ts segment3_0_av.ts segment4_0_av.ts segment5_0_av.ts I know they ...
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2answers
9k views

any way to recover corrupted mp4?

I have an mp4 file that seems to have gotten corrupted somehow: $ file HDV_1042.MP4 HDV_1042.MP4: data $ mediainfo HDV_1042.MP4 General Complete name : HDV_1042.MP4 File ...
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1answer
470 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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0answers
140 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, ...
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2answers
8k 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.
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2answers
332 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
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0answers
26 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
103 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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0answers
92 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
123 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
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1answer
9k 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 ...
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1answer
302 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 ...
36
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8answers
140k 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 ...
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0answers
258 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
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0answers
51 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
164 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
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1answer
110 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 ...
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3answers
1k 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 ...