Frame rate conversion in Linux

[lovyagin]

How to convert frame rate in Linux? For example, convert 50 fps progressive to 25 fps interlaced? In Windows it is very simply by using AVISynth's function SelectEvery, but what about Linux? Using ffmpeg or something like this? And is it possible to double frame rate using motion vectors like MVAnalyse/MVFlowFPS do?

[jagabo]

AviSynth works in Wine. The AviSynth script to convert 50p to 25i is:

SeparateFields()
SelectEvery(4,0,3)
Weave()

AviDemux is available for Linux. I don't know if it will do what you want though.

[lovyagin]

jagabo, pity I tried a lot of things to make AVISynth work under wine but failed to. Probably the main problem is not in AVISynth but in codecs since it always fail to load AC3ACM for example, but DirectShowShource doesn't work at all... so I wasn't able even to try plugins...

Anyway, I suppose wine is not a fastest way, native Linux would be better...

[poisondeathray]

ac3acm is vfw based and directshowsource is directshow based of course - those are system dependent on windows installed codecs/splitters

ffms2 apparently works fine with wine

[lovyagin]

poisondeathray looks like ffms2 really works, thanks. Well, i still haven't got audio but maybe I'll find a way...
BTW, what is faster to convert video to MPEG2 - Wine*HCEnc or AVIDemux + Wine*AVSProxy?

[Bonie81]

you can use avisynth in linux to with avs2yuv.
how to use it? search your distro-forum or on the net.

[poisondeathray]

poisondeathray looks like ffms2 really works, thanks. Well, i still haven't got audio but maybe I'll find a way...

did you specify audio in the script ? e.g. ffaudiosource() with audiodub()

BTW, what is faster to convert video to MPEG2 - Wine*HCEnc or AVIDemux + Wine*AVSProxy?

Not sure about speed with those on linux, you can do some short tests. But I'm certain hcenc's quality will be better.

[lovyagin]

did you specify audio in the script ? e.g. ffaudiosource() with audiodub()

I tried ffmpegsource2 and specify atrack=... but can't know track number. Anyway I tried several and they doesn't work saying nothing or "not an audio track" or "no audio data" (I tried in virtualdub).

But I'm certain hcenc's quality will be better.

Suppose so too...

[poisondeathray]

did you specify audio in the script ? e.g. ffaudiosource() with audiodub()

I tried ffmpegsource2 and specify atrack=... but can't know track number. Anyway

usually atrack =-1 , or you can use ffaudiosource and ffvideosource with audiodub

I tried several and they doesn't work saying nothing or "not an audio track" or "no audio data" (I tried in virtualdub).

What kind of file? where is it from? post mediainfo view=>text back here

[lovyagin]

Format                           : AVI
Format/Info                      : Audio Video Interleave
File size                        : 835 MiB
...
Video
ID                               : 0
Format                           : MPEG-4 Visual
Format profile                   : Advanced Simple@L5
Format settings, BVOP            : No
Format settings, QPel            : No
Format settings, GMC             : No warppoints
Format settings, Matrix          : Default (H.263)
Codec ID                         : XVID
Codec ID/Hint                    : XviD
Duration                         : 58mn 14s
Bit rate                         : 1 806 Kbps
Width                            : 704 pixels
Height                           : 400 pixels
Display aspect ratio             : 16:9
Frame rate                       : 25.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.257
Stream size                      : 752 MiB (90%)
Writing library                  : XviD 1.2.1 (UTC 2008-12-04)

Audio
ID                               : 1
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Codec ID                         : 55
Codec ID/Hint                    : MP3
Duration                         : 58mn 14s
Bit rate mode                    : Constant
Bit rate                         : 192 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Stream size                      : 80.0 MiB (10%)
Alignment                        : Split accross interleaves
Interleave, duration             : 80 ms (2.00 video frames)

with atrack=-1 virtualdub returns

AVISynth open failure:
FFAudioSource: no audio track found

(no video either in this case), atrack=-2 returns video without audio as it should, atrack=0 says "not an audio track", atrack=1 fails with "audio track contains no audio frames", and atrack=2 says "out of bounds track index selected". The clip is fully playable by SMPlayer video+audio though.

UPD: I tried second clip (second part from same source) and it works perfectly. So something wrong with clip indeed. But it is playable

[poisondeathray]

UPD: I tried second clip (second part from same source) and it works perfectly. So something wrong with clip indeed. But it is playable

Sometimes when a video is cut improperly, this happens

You can try divfix++ to repair (I think windows only)

Or you can demux audio (e.g. with ffmpeg ) & load separately in the script

[lovyagin]

Yup, I'll try somehow, probably demuxing, or maybe BASSAudio or something like this will work. Thank you a lot for helping!!!

[poisondeathray]

Yup, I'll try somehow, probably demuxing, or maybe BASSAudio or something like this will work. Thank you a lot for helping!!!

Not sure if bassaudiosource will work, because it uses dyamically linked .dlls which were compiled for windows, but you can try it

Once it's been demuxed , ffaudiosource should work

To stream copy audio e.g.

ffmpeg -i input.avi -vn -acodec copy output.mp3

Then use ffaudiosource on the mp3