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Questions tagged [transcoding]

Transcoding is the direct digital-to-digital data conversion of one encoding to another (video and audio format)

372 questions
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HTML5 audio conversion using NodeJS on Heroku

I have a HTML5 app that allows users to upload and play their audio files. The server is Node running on Heroku. To allow cross-browser audio play, what I understand is that I have to at least maintain two formats of each audio file, let's say .mp3…
nvd_ai
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Drawtext, drawbox or overlay on only a single frame using FFmpeg

I'm using the drawtext and drawbox avfilters on FFmpeg, two of the most poorly documented functions known to man. I'm struggling to work out if and how I can use them on only a single frame, i.e., drawtext on frame 22. Current command: ffmpeg -i…
waxical
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A good way to detect alpha channel in a video using ffmpeg/ffprobe

In my Django application, uploaded video files are transcoded into some particular format using ffmpeg. I now need a way to reliably detect whether uploaded videos have alpha channel or not. I normally use ffprobe for getting video metadata. Could…
Alex Oat
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MP4Box comparing to Qt-faststart

Since I have no idea about qt-faststart (and a little with MP4Box) are there any online resources about them(haven't found much)? Which is better? What about their differences? Especially if i want to create hinted video files for android devices,…
Antonis
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RTSP to HTTP MJPEG transcoding embedded in website

I have a phone which can display http MJPEG streams, and I would like to get this working. I have a camera here, which only sends out an RTSP Stream, I could convert this with vlc to a http MJPEG stream, but my phone needs this embedded into a…
Manuel
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Convert wav to ogg vorbis in Python

How can I transcode a wav file to ogg vorbis format using Python? I can convert to mp3 using PyMedia 1.3.7.3, but when I set the output stream type to 'ogg', I get the error: oggvorbis_encode_init: init_encoder failed and the script dies.
Isaac Sutherland
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Are there some HLS & MPEG-DASH transcoder on the fly?

Are there some free transcoders on the fly which can pack video into hls or mpeg-dash on the fly? I don't want to use live streaming but I want to create vod streaming.
user5390139
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Lowest possible fps of Animated Gif on AWS Elastic Transcoder

From the AWS documentation it looks like the lowest possible fps for an animated gif is 10fps. Is there a way to have AWS create an animated gif with a lower fps?
Mark Catalano
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LibVLC tutorial without SDL?

I am trying to write a video frame by frame to a *.yuv file and found this tutorial about rendering a video into an SDL surface. Now I'm not exactly sure how to use this code without the SDL library. For example, the lock function: static void…
user2273364
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C# video transcoding library

I need to transcode video streams using C#. The streams come in a variety of formats, like MP4, H264, H263, VP8. Is there any library for c# that can transcode a MemoryStream?
KevinA
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Is it possible to have nginx stream a file for download that is currently being written to?

So I have 2 services running, one transcodes a file in realtime (ffmpeg), and another exposes it through http (nginx). The problem I currently have is that when ffmpeg begins transcoding, and I access the file through nginx, only a portion of the…
Mark
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Can't Stream Ogg From ffmpeg Through stdout

To get the the crux of it, why does the first command work, but the second command does not. They produce slightly differently sized files with different contents: ffmpeg -i test.wav -f ogg -acodec libvorbis test.a.ogg ffmpeg -i test.wav -f ogg…
dave mankoff
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FFMpeg HLS Video Transcoding Generating Partial Playlist

I'm trying to convert a basic mp4 video into an HLS video using ffmpeg (running on OSX) using the following command: ffmpeg -i SampleVideo_1280x720_10mb.mp4 -codec:v libx264 -codec:a aac -strict experimental -start_number 1 out.m3u8 It does manage…
moberemk
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FFMPEG Malformed AAC bitstream detected : use the audio bitstream filter 'aac_adtstoasc' to fix it error

I am working with ffmpeg transcoding.c example. When i set video encoder codec to AV_CODEC_ID_H264 and audio encoder codec to AV_CODEC_ID_AAC I got following error. How can i fix this problem.
doğan
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Transcoding MJPEG to FLV or MP4

I want to transcode MJPEG stream that comes from IP camera (http://xx.yy.zz.tt:8080/video.cgi) to FLV or MP4 stream under Linux OS so that users can play the file using a web based Flash player such as Flowplayer. I discovered VLC for that purpose…
Emre Yazici
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