Recherche avancée

Sur d’autres sites (8392)

• requesting script for compressing mp3 files recursively using ffmpeg

  3 mai 2017, par Guddla Rupesh

  Hi I am Rupesh from India. I have a directory of size 65 GB which contains 2500 folders and 7000 mp3 files with 64 kbps bitrate.

  I have installed Windows 8 and Linux with ffmpeg on my system.

  I want to convert all these files to 16 kbps recursively I mean maintain folder structure of source. I have searched web for script and found some code but none of them provided what I want. I have searched even GUI frontend for ffmpeg and found some software but they don’t have option to convert all these files recursively and some don’t have option to convert to lower bitrate.

  I have read ffmpeg manual pages and those was difficult to understand and even I don’t have scripting experience.

  Can you create a script to perform the following steps
  1) The script must compress files in each and every directory maintaining directory structure.
  2) All files must be compressed to 16 kbps and 11500 samples per second with highest quality.
  3) If any errors are encountered during the process the corresponding file information ie., file name with path must be stored in a seperate text file for future viewing.
  4) After the process has been completed the system must shutdown.

  I want accurate compression. Please try to create a bash script ( linux ) or a batch script ( Windows ) and post the script.

  Regards,
  Rupesh.

• I am trying to use the IMA audio encoder and all I get is silence (warning:noob !)

  9 avril 2019, par TerryYim

  o internet !

  As the tree said to the lumberjack, I’m stumped. I downloaded ffmpeg for the first time today and have had quite a lot of fun experimenting with it. So far, I’ve managed to get videos encoded and playing on my Mac OS 9 installation (in Quicktime) using the ’svq1’ video encoder and 16 bit pcm audio. I use this command :

  .\ffmpeg.exe -i .\cat.mp4 -vcodec svq1 -acodec pcm_s16le -ar 44.1k -ac 2 cat_cmon.mov

  However, when I try to switch the audio to adpcm_ima_qt (which I believe is what I should be using for Quicktime 4 - bear in mind that this software is 20 years old) all I get is silence. However, I’m getting silence when I try to play them in Windows too, so I know it’s not the Mac that’s at fault. Here’s what I’m trying to use :

  .\ffmpeg.exe -i .\rivalries.mp4 -vcodec svq1 -acodec adpcm_ima_qt -ar 44.1k -ac 2 rival.mov

  So I’m totally stumped. Am I doing something wrong ? If I am, it’s not something I can see myself. Would anyone be able to lend some wisdom as to how to get the IMA-encoded audio working ?

  Thank y’all !

  ADI.

  Edit : And, just to explain, the reason I want to use adpcm_ima_qt is because PCM is laggy and results in larger file sizes.

• Using OpenMAX (IL ?) for audio/video decoding on Android

  14 septembre 2012, par Christopher Corsi

  Many of the newer hardware platforms running Android, in particular NVIDIA's Tegra 2, support OpenMAX for media acceleration. It's effectively impossible on today's devices to decode 720p video without this support, but the number of demuxers supported on Android are quite slim. The only public API I've been able to find has been through the MediaPlayer class in the Android SDK. There are multiple places in the Android source tree with OpenMAX related tidbits, however.

  On my device (Samsung Galaxy Tab 10.1) I've got access to hardware decoders through a multitude of OpenMAX libs in /system/lib, and it would be great to interface my video application with these. Can anyone point me to information on implementing a decoder powered by OpenMAX ? I've found the documentation from Khronos, but nothing in the way of example code or tutorials. I've already got demuxing and even software decoding taken care of (via libavcodec/libavformat), I'd just like to put hooks in to enable hardware encoding. I'm also assuming here it would be necessary to link directly to the ones available on the device, which makes it pretty lackluster in terms of portability, but it works.

  Alternatively, I'm interested in anything anyone knows about private APIs for accessing the video decoding available on Tegra 2 devices. Especially if there's a vdpau interface like what NVIDIA implements for desktop linux distributions, since there's plenty available for that - but I wasn't able to find shared libraries that indicate that support.