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SoX: concat audiofiles and convert to MP3

I needed to transcode >2GB WAVs to MP3s, so I couldn't just use lame, because I had to glue the WAVs together first. My set of WAVs looked like this: audio.wav audio.w01 audio.w02 Unfortunately, Debian ships with a SoX version which cannot output MP3s (The package "libsox-fmt-mp3" is only ...
by peter_b
Thu Aug 16, 2012 2:13 pm
 
Forum: Knowledge Base
Topic: SoX: concat audiofiles and convert to MP3
Replies: 0
Views: 1811

Re: Video per-frame integrity check - verifying losslessness

UPDATE: As the alignment of audio data within each audio frames can change during remuxing, framemd5 cannot be applied to audio without preparation. Using the audio filter "asetnsamples" helps packing a fixed amount of samples into one frame, therefore making the MD5 sum of each audio fra...
by peter_b
Mon Aug 13, 2012 4:55 pm
 
Forum: Knowledge Base
Topic: Video per-frame integrity check - verifying losslessness
Replies: 5
Views: 7980

Virtualdub: error message "Failed to build filter graph ..."

[PROBLEM] Opening Virtualdub in capture mode, suddenly brought up this error message: CapDShow: Failed to build filter graph: render capture pin (hardware display) [SOLUTION] As complicated as the error message might sound, as trivial is its solution: Virtualdub was opened twice on the same compute...
by peter_b
Tue May 15, 2012 12:48 pm
 
Forum: Knowledge Base
Topic: Virtualdub: error message "Failed to build filter graph ..."
Replies: 0
Views: 1782

VirtualDub: Cannot change capture FPS

[PROBLEM] I've tried o change the capture frame rate in Virtualdub (v1.9.11, 64bit) from PAL (25.0000) to NTSC (29.9700): Capture > Settings > Frame rate No matter which value I've entered, after closing and re-opening the dialog, the framerate was back to 25fps. I've even tried to "round to n...
by peter_b
Mon May 14, 2012 11:21 am
 
Forum: Knowledge Base
Topic: VirtualDub: Cannot change capture FPS
Replies: 0
Views: 1824

VirtualDub append DV: mismatch detected in opaque codec ...

[PROBLEM] I tried to append a computer generated video with black-only frames, encoded in DV. Unfortunately, when trying to append that black-video in virtualDub to an existing DV-video, I got the following error: Cannot append wsegment <filename>: The video streams have incompativle data formast. ...
by peter_b
Thu Apr 12, 2012 2:29 pm
 
Forum: Knowledge Base
Topic: VirtualDub append DV: mismatch detected in opaque codec ...
Replies: 0
Views: 2870

DeckLink: Firmware installation impossible?

[PROBLEM] I've been working with several Decklink SDI cards (and Decklink Studio) without problems for more than 2 years now, but 2 (!) newly bought Decklink SDI cards won't work - because after installing the driver, I get the following error message: An error has occured that has prevented the fi...
by peter_b
Fri Mar 09, 2012 1:35 pm
 
Forum: Knowledge Base
Topic: DeckLink: Firmware installation impossible?
Replies: 0
Views: 2060

Video per-frame integrity check - verifying losslessness

[PROBLEM] Sometimes you want to verify the integrity of your video material when dealing with lossless codecs. The only way to be sure that not a single bit of visual information is lost, is by decoding each frame into an uncompressed image and verify that. [SOLUTION] Using ffmpeg: ffmpeg -i video....
by peter_b
Thu Jan 06, 2011 1:10 am
 
Forum: Knowledge Base
Topic: Video per-frame integrity check - verifying losslessness
Replies: 5
Views: 7980

Losslessly split/merge AVI video files

I know that there are plenty ways of splitting AVI files, but I needed it with a bit more reliability and precision than most others require for home use. The video was encoded using Huffyuv (so it's lossless and only keyframes), and the audio was PCM 16bit 48kHz. So it should be possible to exactly...
by peter_b
Sat Feb 27, 2010 8:54 pm
 
Forum: Knowledge Base
Topic: Losslessly split/merge AVI video files
Replies: 3
Views: 6590
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