[HELP] Old AVI seems to have an unworkable frame rate, don't know what to do

[Selur]

Looking at that file wit MediaInfo, it shows:

Video Count : 390 Count of stream of this kind : 1 Kind of stream : Video Kind of stream : Video Stream identifier : 0 StreamOrder : 0 ID : 0 ID : 0 Format : MPEG-4 Visual Format : MPEG-4 Visual Commercial name : MPEG-4 Visual Format profile : Simple@L1 Format settings, BVOP : No Format settings, BVOP : No Format settings, QPel : No Format settings, QPel : No Format settings, GMC : 0 Format settings, GMC : No warppoints Format settings, Matrix : Default (H.263) Format settings, Matrix : Default (H.263) Internet media type : video/MP4V-ES Codec ID : XVID Codec ID/Hint : XviD Codec ID/Url : http://mediaarea.net/XVID Duration : 1356820 Duration : 22 min 36 s Duration : 22 min 36 s 820 ms Duration : 22 min 36 s Duration : 00:22:36.820 Duration : 00:22:31:10 Duration : 00:22:36.820 (00:22:31:10) Bit rate : 1829096 Bit rate : 1 829 kb/s Width : 604 Width : 604 pixels Height : 478 Height : 478 pixels Sampled_Width : 604 Sampled_Height : 478 Pixel aspect ratio : 1.000 Display aspect ratio : 1.264 Display aspect ratio : 5:4 Frame rate : 59.750 Frame rate : 59.750 FPS Frame count : 81070 Color space : YUV Chroma subsampling : 4:2:0 Chroma subsampling : 4:2:0 Bit depth : 8 Bit depth : 8 bits Scan type : Progressive Scan type : Progressive Compression mode : Lossy Compression mode : Lossy Bits/(Pixel*Frame) : 0.106 Delay : 0 Delay : 00:00:00.000 Delay : 00:00:00:00 Delay : 00:00:00.000 (00:00:00:00) Stream size : 310219316 Stream size : 296 MiB (90%) Stream size : 296 MiB Stream size : 296 MiB Stream size : 296 MiB Stream size : 295.8 MiB Stream size : 296 MiB (90%) Proportion of this stream : 0.89641 Writing library : Lavc52.66.0 Writing library : Lavc52.66.0

ffmpeg reports:

Input #0, avi, from 'c:\Users\Selur\Desktop\strangeparadise.avi': Metadata: software : Lavf52.61.0 Duration: 00:22:37.35, start: 0.000000, bitrate: 2039 kb/s Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 604x478 [SAR 1:1 DAR 302:239], 1829 kb/s, 59.75 fps, 29.88 tbr, 59.75 tbn Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 192 kb/s

Looking at the video shows that someone encoded and interlaced input as progressive without deinterlacing.
XviD does not support interlaced content and is highly compressed, so whoever created this messed up. (at least the source seemingly wasn't cropped or resized during the progressive re-encoding step.)

Since the file itself has no frame count info, most tools fill calculate the frame rate through the playtime and the frame rate. So depending on the assumed frame rate and play time, the reported frame count will differ.

If I don't select any of these options and just have Hybrid encode it to x264 or something, the file "says" it has a run time of 22:37, but plays as double speed and cuts out halfway through.

Naturally, since the source isn't properly flagged and should have a frame rate that is near 29.97 fps.

With the "Scale Speed" and "Scale Output to Duration" options on Hybrid, it outputs as a proper 29.97 FPS file with a constant frame rate and good audio and video sync. Except Hybrid and ffmpeg reports it as having 40561 frames, while my media player and Topaz Video AI report 40660.

Since remuxing the .avi to .mkv using mkvmerge returns a file reporting 40561 frames, this seems correct to me. If audio and video is sync, I see no issue with using this way.

Cu Selur

Ps.: additionally, the source is vfr not cfr.