![]() After this image is generated, we upload it to our Across ImageServer. This would generate a waveform in PNG format and split the different audio channels in the waveform. $ ffmpeg -y -i inputfile -filter_complex "showwavespic=colors=#007bff:split_channels=1" -frames:v 1 -c:v png -loglevel -8 ![]() ![]() To display the waveform on overview pages, we simply use ffmpeg to generate a waveform with the following command Audio thumbnail generation and audio playing A video file would have to generate a good thumbnail for that video.īased on the metadata above, you can quickly differentiate if the uploaded media file is an audio file or a video file (a video file has a video stream/track).īoth follow another track for thumbnail generation. An audio file would have to generate a waveform. Thumbnail generationįor thumbnail generation, there were two requirements. the duration and the format of the media file). Wrapping these outputs to a common data structure was more than enough to do our metadata processing checks and store some of the metadata for display purposes (e.g. deb packages from – otherwise you will be stuck with a (very) old version which has no JSON output. #Java how to use ffmpeg installNote that if you are using a stock Debian install, you need to install the. ![]() $ mediainfo -output=JSON _polarity_guitarOK.wav "format_long_name": "WAV / WAVE (Waveform Audio)", "codec_long_name": "PCM signed 16-bit little-endian", $ ffprobe -show_format -show_streams _polarity_guitarOK.wav -print_format json -loglevel 0 The parser we wrote supports ffmpeg and Mediainfo for flexibility and maps the JSON from these tools onto the same data structure. MediaInfo is a tool which was suggested by the customer and provides structured metadata probing from media files. If you have ever converted your personal (S)VCD,DVD disks to MKV (Matroska container) – or AVI, MPEG back in the days – you surely noticed that ffmpeg is the defacto tool for converting/parsing media files. We looked at ffmpeg and MediaInfo for this. So what are the options? Metadata parsing But would you really want to parse and read files in the JVM? The short answer is no, you don’t want all this crud in your Java memory. There are libraries like Netflix Photon ( ) and. We looked for libraries that could parse video files (in this case we were talking MXF files) to extract the metadata. We aren’t talking about a Netflix streaming platform here, just some basic audio/video streaming. In short we had to parse metadata for all kinds of audio and video assets and then render this media file to the customer. if the bitrate or other metadata was not adequate). ![]() The page also showed some metadata from the media asset and files would be rejected after upload (e.g. Recently we were involved in a project where we had to display and play audio/video files which had been uploaded by a customer. These libraries are also what we use in our ImageServer Across Module to generate thumbnails and variants for images, PDFs, … At the end of the line you are better off with open source libraries specifically written for image processing, like ImageMagick and GraphicsMagick. ImageIO classes have come a long way since JDK7 – together with the usual SDK bugs – not always giving you what you expect (bad image quality, not always supporting all types of JPEG standards, …). Processing of images – let alone videos – within the Java JVM has always been a challenging task. ![]()
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