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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)

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How to detect generation loss of a transcoded audio

Lets say you have a 96 kbit mp3 and you Transcode the file into a 320 kbit mp3. How could you programmatically detect the original bit rate or quality? Generation loss is created because each time a lossy algorithm is applied new information will…
rook
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Objective-C, AVFoundation Export movie with changed metadata

I want to export some video with custom creation date in metadata to mov file. The problem is, that I managed only to change one of dates stored in file. This is ffmpeg output of created video: Metadata: major_brand : qt minor_version …
Damian Dudycz
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Problems transcoding GoToMeeting output using FFmpeg

I'm having a nightmare of a time transcoding output from GoToMeeting, recorded using the latest OS X version, to something web-playable. No matter what settings I use, I end up with time syncing problems, at least with this particular recording. The…
user3466413
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FFMpeg's stream segmenter

I'm using FFMpeg to segment a WAV file into mp3s for use in HTTP Live Streaming. I'm using this command: ffmpeg -i input.wav -c:a libmp3lame -b:a 128k -map 0:0 -f segment -segment_time 10 -segment_list outputlist.m3u8 -segment_format mp3…
MouseTech
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AAC's converted from CAFs for HTTP Live Streaming

I have several AAC files that were converted from CAF files, for use in HTTP Live Streaming. The stream works, however there is a small gap between each AAC file. It is my understanding that this gap is caused by the "Priming" and "Remainder" frames…
MouseTech
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Will using an NSKeyedArchiver/NSCoder persist even after an application update?

I have NSKeyedArchiver and NSCoder data being persisted (as .txt files) and working great. When I deploy new builds to the iphone, the text files are still present - in other words, they are not being written over. However, I want to make sure that…
mr-sk
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How to encode audio in AAC-LC, AAC-HE-V1, AAC-HE-V2 using libavcodec?

I am trying to encode audio in AAC-LC,AAC-HE-V1, AAC-HE-V2 using libavcodec/ffmpeg APIs. But when I am using the following configuration and API calls.It says "invalid AAC profile." AVCodecContext *encoder_ctx; encoder_ctx->codec_id = …
Harit Vishwakarma
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How do you connect to AWS Elastic Transcoder?

I'm trying to transcode some videos, but something is wrong with the way I am connecting. Here's my code: transcode = layer1.ElasticTranscoderConnection() transcode.DefaultRegionEndpoint =…
Eddie E Massey III
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HTML5 Multi-platform player with one Wowza stream

GOAL FLV Video files being served by Wowza Media Server to be played on all devices, platform/browser independent. I'm currently working with a player loaded with AJAX which uses VideoJS. WHERE IM WORKING http://activemd.net/html5/ THE CODE It…
Rick Scolaro
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Remuxing mp4 on the fly with FFmpeg API

My goal is to stream out mpegts. As input, I take an mp4 file stream. That is, video producer writes mp4 file into a stream that I try to work with. The video may be anywhere from one minute to ten minutes. Because producer writes bytes into stream,…
Vadym
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Raspberry Pi: MJPEG encoding

I'd like to transcode video from H264 to MJPEG on the Pi. Schematically, there's a process that injects an H264 raw stream in a pipe and takes out (in real time) the same stream, encoded with MJPEG, from anoher pipe. Currently, the black box that…
janesconference
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Video Format Analyzer

I have a video file I don't know what format it is. Is there a software can analyze what kind of video container / compression format it uses? I tried Gspot, but it doesn't work (Show "Unknown format") I am sure the file is using some kind of public…
KenC
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android.media.MediaExtractor. Anyone got this beast to work? "Failed to instantiate extractor" exception

Trying to run this (example code from developer.android.com) MediaExtractor extractor = new MediaExtractor(); extractor.setDataSource("/sdcard/myvideo.mp4"); Getting "Failed to instantiate extractor" exception on the second line. Tried to place the…
Paul Kapustin
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Does ffmpeg rewrite the header after finish transcoding?

Our client sends a request to download a movie file from a server. As the server receives the request, it will start a ffmpeg process to transcode the movie. The output of ffmpeg is temporarily saved to harddisk. We dont want to make client to wait…
jAckOdE
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Mac OS command line tool handle asynchronous export video for re-encoding (Edited and working now)

I tested the export method on an iOS application and it works fine. But when I moved it to a command line project the method exportAsynchronouslyWithCompletionHandler doesn't work. I know the possible cause is the command line tool cannot handle…
Jingjie Zhan
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