The process and techniques used when storing moving images, sound, metadata and other streams as a digital file.

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Downloading earlier segments from a live m3u8 playlist

I have an .m3u8 URI of type LIVE. As far as I know, live playlists use a sliding window instead of containing all the segments. My questions are, 1) Is it possible to find out what the length of ...
3
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2answers
1k views

Add image under the video with ffmepg

I want to extend basic usage of watermark and put it under the video. That means. I have input video 720x480 and image 720x20. On output i want to have video 720x500 where video aspect is preserved ...
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1answer
148 views

Removing MP4 encoding information

Is it possible to remove certain information form a MP4 file? Specifically things like tagging and encoding dates, Writing library and application, Encoding settings... No client needs to know when I ...
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4answers
28k views

How to losslessly encode a jpg image sequence to a video in ffmpeg?

I have a large set of jpgs that I want to convert to a video losslessly (or, at the very least, very close to losslessly as long as the encoding time isn't much higher than otherwise). Naively, I ...
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0answers
20 views

Why is this mp4 file corrupted?

I recorded this file by an Android encoder, but after a while the video gets corrupted. However re-encoding with FFMPEG fixes it. But I'd like to know what's wrong with the original file. http://...
3
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1answer
29 views

Trading off resolution vs quality

I have some 720p 30FPS H.264 video that I want to downsample for online backup. I want to get to somewhere around 10% to 20% of the existing size, which will evidently require a large sacrifice in ...
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0answers
8 views

HandBrake Not Allowing Multiple File Encodings at a Time

(Note that this question is similar to a question that I posted on the Linux stack exchange, but I figured it would be more appropriate to ask it here.) I've been trying to get HandBrake to convert ...
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1answer
134 views

How to prevent lossy re-encode of low-bitrate videos uploaded to YouTube

I have a huge number of low-res Flash videos (480x270, 30 fps, 800 Kbps) and I want to resample all those videos in 1280x720 with some added spatial sharpening and lomo filters to make them look nicer....
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5answers
88 views

Live streaming to a disk

Not sure if this is the right place to ask this question (pretty technical), but I thought I'd start here. I'm interested in building a website that will have a streaming-video feature. It's not ...
2
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1answer
104 views

How can I avoid Quicktime Vulnerability with h.264 encoded MP4 files?

I posted this earlier on SuperUser, but realized that this is likely the more appropriate forum for my question. We have several thousand very large MP4 files that have been encoded over the past ...
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2answers
231 views

What are supported stream formats for h.265

I wanted to know what are the possible streaming formats for streaming a video using H.265. Does H.265 support rtsp and rtmp based streaming? Currently, I am using ffmpeg to live stream the camera ...
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1answer
25 views

Best encoding to fit 10hours of 1080p in 30gb?

I will be running a 10hour loop on a 1080p screen with only 30gb of storage. The loop will be created from a variety of 1080p .mp4s that will need to be compressed. (for example, one video is 12mins ...
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1answer
34 views

How to create MPEG-DASH variants at resolutions where one dimension is not a whole number in pixels?

I've created a bunch of variants and a DASH manifest for Sintel, which more or less works, but does not pass validation. The issue is when I want to scale a video to a specific width, but the height ...
0
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1answer
26 views

Batch encode to X265 on the Mac

I need to encode thousands of MP4 H264 (mostly) files in a folder hierarchy to H265. Unfortunately Handbrake that I'd normally use have dismal support for batch processing of hierarchies. The ...
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1answer
33 views

Is there something like nvenc for free codecs (VP8/9)?

I'm new to video encoding. And I was looking at h264/265 and VP8/9. I'd like to use VP8/9. But it seems like nobody except Google is pushing it. I just want to know does someone else support VP8/9? ...
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2answers
32 views

Using mediafilesegmenter on a video with edit lists

I'm trying to use mediafilesegmenter on a video I transcoded with ffmpeg to package it for HLS. However, it complains about "edit lists" and refuses to do anything. Does anyone know how to either ...
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0answers
19 views

Dash player stalls on high bitrate video

I transcoded Sintel for Dash using the commands below. Everything seems fine, except the Dash.js Reference Player stalls at 3:30 - I run it on a local HTTP server with a clone of their Github project -...
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0answers
38 views

MPC-HC is altering the colors

In order to test a lossless recording system, I have to verify that the input video is exactly the same than the output video. As a test source I have generated an ffmpeg's testsrc pattern, which is ...
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1answer
248 views

8bit vs 10bit vs 12bit

I do a lot of HEVC encoding and what I've read is 10bit is always better than 8bit, even from an 8bit source, because it avoids rounding errors. Is that true? Also, then is 12bit better than 10bit or ...
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1answer
22 views

Is there a mathematical equation to compute the bitrate of a Cisco H.264 stream?

I'm working on adaptive streaming for video. As I'm using a Cisco Open H.264 Encoder, I'm testing multiple configurations for the encoder. A configuration consists in a several of parameters (bps, fps,...
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0answers
13 views

Change the slice mode during the encoding in H.264

I'm working in implementing a back pressure mechanism between to locutors in a video comunication to manage the bandwidth consumption. Does the slice modes and the rc modes affects the packets size ...
0
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0answers
103 views

x265 encoding test: 12bit results a bigger file size than 8bit of the same config?

Just got curious of this x265 HEVC format, and tried it on a 1920x1080i BDMV stream video, one encoded with 8bit depth and then another encoded with 12bit depth. The results are, the 8bit output was ...
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3answers
41 views

Modify video file for viewing in generic media player

I have a file called ~/somePath/foo.264, containing video from a surveillance camera's DVR. I am unable to view this video on several media players including the default media player on an Apple ...
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1answer
215 views

How should I encode my 4K video stream?

I'm capturing uncompressed 4K video from my Sony A7R II via a video capture device, and am using ffmpeg to save the video. My problem is I don't know what codec to use. The two options I tried are: ...
3
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1answer
47 views

How to calculate the length of the video file that was encoded so far?

I am using ffmpeg to convert a video file to H.264 format. If I call ffprobe while ffmpeg is still running the duration of the video is not known. Only when ffmpeg finishes the ffprobe will display ...
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6answers
136 views

Does repeatedly saving a video degrade its quality?

I take a video file, let's say an mp4, and use, let's say Windows Movie Maker, to repeatedly just save it, with no edits. Every time, the software has to convert the video into a format it can edit, ...
3
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0answers
69 views

Netflix encoding system - MAPLE

I understand that Netflix does all their encoding in AWS using EC2. They have a custom encoding software called MAPLE that chunks all source video into 2-3 second chunks and encodes in multiple codec ...
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1answer
20 views

Using AAC-HE for 5.1 audio?

A couple of questions when thinking about 5.1 audio encoding: What are the limitations of AAC-HE codec while doing 5.1 audio ? Why is AC3 preferred when compared to AAC-HE ?
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1answer
82 views

Convert 1920x1080 Video to 720x480 With Letterboxing

I'm trying to find the best application on windows to do this HD to SD conversion for a video server which requires files to be exactly 720x480/29.97fps MP4 H.264 to function. I can't find any options ...
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0answers
43 views

How did PayPal get this video's file size so small?

This video from PayPal is 10 seconds long, 1280x720, and 23.976 FPS. The webm version is 485 KB and the mp4 version is 340 KB! I realize that there's not a lot of motion going on in the video and ...
0
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1answer
30 views

Exporting a video from Premiere spits out incorrect quality

I'm trying to export a video from Premiere(CC) with the following settings: I recorded this video in Motion-JPEG 1080p/60Fps out of Bandicam. I've recorded videos in Bandicam (same settings as ...
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1answer
58 views

Quicktime rendering issue

I am trying to export my composition from AE CC but when I hit 'Render' nothing happens. In status is says 'Rendering' but this is not the case and the cursor looks like it's working but nothing is ...
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1answer
37 views

Best Streaming Encoding Software to incorporate a message feed

I am trying to stream a weekly boardgaming video podcast. I was hoping to incorporate a message feed to video. I want the people playing the game to be able to show watchers their strategies without ...
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0answers
6 views

3D Studio Max on AWS EC2 recommendations

Anyone using 3D Studio Max in AWS EC2 on G2 instances what is the performance and point of views and suggestions
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2answers
78 views

Recompressing many huge MOV files

My camcorder produces huge MOV files, and I use it for about 1 hour every day, which gives me more than 7 GB of data per day (around 128 MB per minute of recording). Here is the codec information ...
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0answers
327 views

Adobe Premiere Pro and Media Encoder crash on encoding

Well, I can't export anything, Premiere Pro or Media Encoder keep crashing. Crashes are quite unexpected, after several minutes or several hours, without any explanations: "Adobe [--] stopped working"...
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1answer
28 views

Best format to export to in blender

I am using blender video sequence editor feature. When I export my video I have subtle quality loss. There are mild flickering artifacts. I have a couple question related to that. First one, is what ...
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2answers
2k views

H.264 or VP9 for encoding for YouTube?

I make short films which I distribute through YouTube. I know YouTube uses VP9 for streaming, but YouTube still recommends uploading with h.264. It makes more sense to me to upload in as similar a ...
2
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2answers
140 views

What is the correct MPEG-2 FourCC?

In my attempts to encode a video to MPEG-2 in an MOV (which seems to be a valid combination, at least according to Wikipedia), using ffmpeg (-vcodec mpeg2video) and other tools, I have become ...
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1answer
27 views

To MP4V, or to DX50, or not to be

Should i compress my final outputs down to FOURCC of DX50 or MP4V? Tis the question. I'm having a hard time deciding on this, since im not really sure what to expect in future technology development....
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2answers
40 views

How can I efficiently convert MOV / MPEG-4 files for long term storage?

I have a Canon 6D DSLR that I am shooting video on. The camera is set to capture 1280x720 60fps IPB MOV / MPEG-4 files. The video files are in the range of 250MB per minute of recording. I have ...
0
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1answer
163 views

How to avoid uploaded video being re-encode by Facebook

I just uploaded a video to Facebook yesterday, and then I tried to download the video as HD, and I realized that Facebook actually re-encode the video even though the original video file doesn't ...
5
votes
1answer
102 views

Adobe Encoder fps and duration doesn't match

I have After Effects project file 25 fps, 29 seconds duration long. After exporting i get 725 png files - looks normal so far. But then i merge it to mp4 using Adobe Encoder, I get total 24 seconds ...
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0answers
48 views

H264 vs H265 encoding time issues using B-frames

I run video encodings using H264 and H265. In H264 using JM reference software GOPs having B4 need greater encoding time than having B2, and GOPs having B2 need greater encoding time than B0. In ...
5
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3answers
2k views

YouTube Compression: Why?

There's a lot of advice on the internet on encoding settings to apply to your video before uploading to YouTube (https://support.google.com/youtube/answer/1722171?hl=en, ...
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1answer
1k views

Encoding videos for MPEG-DASH

I read this article on encoding for MPEG-DASH, which has helped me a little and then follow up article. My end goal is to create a batch file that can read in a directory of MP4 files, and then ...
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2answers
7k views

Adobe After Effects MP4 Export Issue

I'm trying to export a composition from Adobe After Effects. My Comp is 1280x720, and ideally I'd export with an mp4 container, and h264 video codec. Problem is, After Effects is giving me a PAR error,...
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1answer
80 views

how to measure bitrate of video over time

Given an encoded video file with non-constant bitrate, how would one analyze the bitrate over time? So far I found one old program that produces a bitrate plot, but none that can give the raw data of ...
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1answer
94 views

How to convert an mkv file with hevc encoding to mkv with avc

I have some mkv files with a hevc encoding which is not allowing me to burn to disc in covertxtodvd as it shows no video track as the encoding isn't supported, i was wondering if it was possible to ...
3
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1answer
34 views

MPEG - the maximum range for R,G,B?

There are sentences: For analog video or MPEG (including DVD) output, the maximum range for R,G,B is [16, 235] (8-bit). For YUV, the maximum range for intensity (Y) is [16, 235] (8-bit). Is this ...