Recently I wanted to try out the Webm codecs VP8 and VP9 but when I ran ffmpeg to encode a H.264 MP4 file into one of the other two codecs, I realized that the encoding is (by almost an order of magnitude) slower. A 1080p30 video from H.264 to VP9 at 3 MBit/s is being … Read more
I’ve got a problem with vlc playing some file formats, for example mkv or m2ts (I didn’t notice this problem with avi though). The sound plays ok, than dissappears for a second or two, than re-appears. It occurs around once every 10 seconds. This is really annoying and prevents me from using VLC for those … Read more
I need to encode a short video in a format that can be played with windows media player on windows xp without installing any additional codecs. For the recoding process I’m using ffmpeg. I’ve already tried the msmpeg4v2 codec but the quality is horrible (compared to the original video you see large “blocks”) so I’m … Read more
Reading about video quality I found that it depends of resolution, frames per second and bitrate, which decides the size of the video. My question is how the bitrate is calculated and how it can differ. Let’s say a video has a 360×240 resolution. It takes 86400 pixels per frame. The frame rate is 30 … Read more
Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Super User. Closed 2 years ago. Improve this question A couple of years back MP3 was the most supported format for portable devices. Then Apple came along and wiped the floor of … Read more
What is the difference between using -vcodec copy and -sameq with FFmpeg? Do they do the same thing? Answer -sameq does not force you to use the same video codec. You can, for instance, convert H.264 to DivX while using -sameq. AttributionSource : Link , Question Author : tony_sid , Answer Author : CarlF
How can I find which codec an AVI file needs? A method that does not require downloading a program would be preferred (such as looking at the file in notepad). Answer Open in notepad, do a search for ‘vids’ – the FOURCC value is right after that. Eg you’ll find something like: vidsWMV1 Then google … Read more
I’ve got a bunch of ts segments described by a single index.m3u8 file: index.m3u8 segment1_0_av.ts segment2_0_av.ts segment3_0_av.ts segment4_0_av.ts segment5_0_av.ts I know they are all encoded the same way. ffprobe gives me the following: Input #0, mpegts, from ‘segment1_0_av.ts’: Duration: 00:00:10.00, start: 0.100511, bitrate: 1251 kb/s Program 1 Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), … Read more
I’m so confused… what is the difference between an audio/video codec (which apparently is a shorthand for “encoder/decoder”, kind of like how “modem” is really “modulator/demodulator”) and an audio/video format? (Am I even using the correct terminology?) i.e.: What is the difference between saying something is “MPEG-4” and saying something uses the “DivX” codec? Why … Read more
