Hey everyone
I'm encoding a x264+AAC but it has an A/V sync problem:
The final mp4 has a seeking A/V synchronism problem when using x264 to encode video.Code:ffmpeg -i AudioFile_80.ac3 -ac 2 -vn tmp.wav faac tmp.wav -o audio.mp4 x264 --bitrate 1000 -o video.mp4 VideoFile.m2v **or** ffmpeg -y -i VideoFile.m2v -vcodec libx264 -b:v 1000k -an video.mp4 ffmpeg -i video.mp4 -i audio.mp4 -acodec copy -vcodec copy final.mp4
I prefer x264 over ffmpeg because it produces a smaller filesize with the same quality.
ffmpeg, generates a bigger file but no A/V sync problem.
What am i doing wrong?
thanks
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Hi
What is the result like if you do the job in just one operation?
Like this:-
Code:ffmpeg -i VideoFile.m2v -c:v libx264 -crf 23 -preset medium -i AudioFile_80.ac3 -c:a aac -strict experimental -b:a 128k -ar 44100 -ac 2 final.mp4
Last edited by bat999; 9th Jul 2012 at 21:26.
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it works, but hte problem is:
I prefer x264 ENCODER (NOT FFMPEG) over ffmpeg because it produces a smaller filesize with the same quality.
ffmpeg, generates a bigger file but no A/V sync problem. -
Maybe your "VideoFile.m2v" has pulldown flags, OR it's a mixture of progressive and telecined sequences, and x264 is not dealing with that correctly
Try the switches --force-cfr and --demuxer ffms
EDIT ---
Even better, why not use DGindex and DGdecodeLast edited by El Heggunte; 9th Jul 2012 at 18:42.
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Maybe your "VideoFile.m2v" has pulldown flags, OR it's a mixture of progressive and telecined sequences, and x264 is not dealing with that correctly
Try the switches --force-cfr and --demuxer ffms
Actually this m2v file comes from demuxing of ifo/vob with pgcdemux
What bugs me is that ffmpeg encoding won't result on A/V sync (seeking) problem and x264 does!
ffmpeg -i video.mp4 -i audio.mp4 -acodec copy -vcodec copy final.mp4:
Code:video:157099kB audio:19665kB global headers:0kB muxing overhead 0.541414%
Code:General Complete name : VideoFile.m2v Format : MPEG Video Format version : Version 2 File size : 953 MiB Duration : 18mn 5s Overall bit rate mode : Variable Overall bit rate : 7 365 Kbps Video Format : MPEG Video Format version : Version 2 Format profile : Main@Main Format settings, BVOP : Yes Format settings, Matrix : Custom Format settings, GOP : M=3, N=12 Duration : 18mn 5s (WRONG!) Bit rate mode : Variable Bit rate : 7 365 Kbps Maximum bit rate : 9 800 Kbps Width : 720 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 23.976 fps Standard : Component Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Scan order : 2:3 Pulldown Compression mode : Lossy Bits/(Pixel*Frame) : 0.889 Stream size : 953 MiB (100%) Color primaries : SMPTE 170M Transfer characteristics : SMPTE 170M Matrix coefficients : SMPTE 170M
Code:General Complete name : video.mp4 Format : MPEG-4 Format profile : JVT Codec ID : avc1 File size : 154 MiB Duration : 21mn 41s Overall bit rate : 991 Kbps Encoded date : UTC 2012-07-09 22:54:38 Tagged date : UTC 2012-07-09 22:54:38 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L3.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 21mn 41s Bit rate : 1 000 Kbps Maximum bit rate : 5 520 Kbps Width : 720 pixels Height : 480 pixels Display aspect ratio : 4:3 Original display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 25.000 fps Standard : NTSC Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.116 Stream size : 153 MiB (100%) Writing library : x264 core 125 r2200 999b753 Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=1000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Encoded date : UTC 2012-07-09 22:54:38 Tagged date : UTC 2012-07-09 23:06:28
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If the frame rate isn't the issue try re-muxing the encoded MP4 using something else. Or even just use MKVMergeGUI to remux it as an MKV to see if the problem goes away. I've had sync/playback issues on the odd occasion which remuxing has fixed, especially using standalone players. Back when I was using CCCP it'd happen every now and then with MP4s. Either remuxing them as MKVs or using MPC-HC's internal splitter instead of Haali would solve the problem.
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Hey everybody!
Thanks for the answers!
x264 --bitrate 1000 --fps 23.976 -o video.mp4 VideoFile.m2v
it 'almost' solve the problem as the audio stills ~1 second ahead from video.
x264 help:
Code:--pulldown <string> Use soft pulldown to change frame rate - none, 22, 32, 64, double, triple, euro (requires cfr input) --fake-interlaced Flag stream as interlaced but encode progressive. Makes it possible to encode 25p and 30p Blu-Ray streams. Ignored in interlaced mode.
it's funny, now the x264 video gets as big as ffmpeg's encoded. maybe 25fps dropped some frames from source...
ffmpeg -y -i VideoFile.m2v -vcodec libx264 -b:v 1000k -an video.mp4
Frame rate : 59.940 fps (wtf? i didnt put any deinterlace on it!)
What is better for portability (bluray/dvd players mplayer, vlc, ...):
- x264 ou ffmpeg?
- avi or mp4 or mkv?
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