I have some SD PAL interlaced AVI files that were captured from SD tapes (720x576). It shows to have been captured at 28.8 Mb/S.
I want to convert these to MP4 (H264) so that I can play them on TV etc. What is a a reasonable bitrate to encode them to MP4? 28.8Mb/s seems to be overkill for SD video IMO.
Format : AVI
Format/Info : Audio Video Interleave
Commercial name : DV
Format profile : OpenDML
File size : 19.0 GiB
Duration : 1 h 31 min
Overall bit rate : 29.8 Mb/s
Writing library : yzer
TAPE : sclive
Video
ID : 0
Format : DV
Codec ID : dvsd
Codec ID/Hint : Sony
Duration : 1 h 31 min
Bit rate : 28.8 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 4:3
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.778
Stream size : 18.4 GiB (97%)
+ Reply to Thread
Results 1 to 12 of 12
-
-
If you are going o use app for conversion that uses x264 encoder (most of them if not all of them can use it) you may select CRF encoding when you select quality rather than bitrate. It is one pass only and encoder distributes bitrate depending on source.
So if choosing x264 encoder, making audio H.264 you CRF (or Handbrake uses RF name for it) value about 17 -18. The lower the better quality but video size increases. While lowering CRF you get to the point where visually you see no differences and size balloons up only. The sweet spot quality/video sizes for DV tapes is about 17-18. That value would give you bitrates something overall 4 to 6 Mbits/s. -
Doesn't matter how it's re-encoded. Analog to DV is damaged to begin with.
- My sister Ann's brother -
At crf 16 with x264 my encodes fall anywhere from .6-4mbps all depends on the source noise etc. The average is 1.5mpbs
if all else fails read the manual -
For your files a bitrate of 1Mb/sec is more than enough. Try to make a re-encode with my smart FFMpeg gui, setting a crf 25.
https://forum.videohelp.com/threads/395425-New-small-GUI-for-FFmpeg -
-
-
The DVD spec, which is what this video's resolution matches, allowed for a maximum of 9.8 Mb/s for video; in theory H264 would allow a 50% bit rate savings over MPEG-2.
Based on the above, if the OP was to convert his DV format capture to a DVD compatible mpeg-2, he would use 9.8 Mb/s, so it stands to reason that if he uses an H264 encoder he should use 4.9 Mb/s if he wants similar quality to what a good MPEG-2 encoder could do at max DVD spec bit rates or even more than 4.9 Mb/s if he wants potentially even higher quality video.
I see no sense in encoding his capture at absurdly low 1 Mb/s that someone recommended. We also have to take into account that he will most likely want to deinterlace as well. -
He's not creating a DVD, so what's the sense in recommending a bitrate for an encoder based on the maximum bitrate that can be used with an older encoder for DVDs? It's like saying that if the maximum bitrate for DVD AC3 audio is 448kbps, if you encode the audio as AAC you should encode it at 224kbps. There's no direct relationship between the two in respect to quality. Haven't you ever seen a horrible looking DVD with a bitrate of 9.8Mb/s and nice clean looking video at the same bitrate? It makes far more sense to select a particular quality for x264 and let the bitrate be whatever it will be.
It didn't take much looking to find a 720p encode that came in at 450kb/s lower than a DVD encode, both at CRF18, because the 720p video was much cleaner. Should I have encoded the DVD based on mpeg2 DVD bitrates and the 720p video based on Bluray bitrates instead?Last edited by hello_hello; 27th Feb 2020 at 03:37.
Avisynth functions Resize8 Mod - Audio Speed/Meter/Wave - FixBlend.zip - Position.zip
Avisynth/VapourSynth functions CropResize - FrostyBorders - CPreview (Cropping Preview)
Similar Threads
-
Split mp4 file into specified size (part1.mp4, part2.mp4 etc.)
By TubeBar in forum EditingReplies: 7Last Post: 1st Feb 2019, 22:41 -
how can i join two videos a1.mp4 + a2.mp4 = a12.mp4
By sommers in forum Newbie / General discussionsReplies: 14Last Post: 8th Jun 2017, 18:01 -
transcode vob to mp4 - highter bitrate vs resize larger - how much of each
By wolfdogg in forum Newbie / General discussionsReplies: 45Last Post: 25th Dec 2016, 09:41 -
Homemade mp4 files quality vs. ripped movies in mp4 format
By MrMX in forum Newbie / General discussionsReplies: 11Last Post: 26th Nov 2015, 22:12 -
which mp4 muxer app to use / How to find video bitrate on windows?
By mrjayviper in forum Video ConversionReplies: 4Last Post: 25th Jun 2015, 18:30