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Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
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Sur d’autres sites (7658)
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ffmpeg "Time code of first frame" not making sense [closed]
23 janvier, par Kevin VaskoI can't seem to make sense of where ffmpeg is coming up with the "Time code of first frame" value.


My original file that I am using.


This video has the general timestamps of the original encoding date (aka the start time of the video the way I understanding it) and a duration of 8 min and 52s


$ mediainfo GL0100002_output.mp4 
General
Complete name : GL0100002_output.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 93.7 MiB
Duration : 8 min 52 s
Overall bit rate : 1 476 kb/s
Encoded date : UTC 2022-02-23 15:18:42
Tagged date : UTC 2022-02-23 15:18:42
Writing application : Lavf58.29.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8 min 52 s
Bit rate : 1 342 kb/s
Width : 848 pixels
Height : 480 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.138
Stream size : 85.2 MiB (91%)
Title : GoPro AVC 
Writing library : x264 core 155 r2917 0a84d98
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=12 / lookahead_threads=2 / 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=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Encoded date : UTC 2022-02-23 15:18:42
Tagged date : UTC 2022-02-23 15:18:42
Color range : Full
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 8 min 52 s
Bit rate mode : Constant
Bit rate : 129 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 8.16 MiB (9%)
Title : GoPro AAC 
Language : English
Default : Yes
Alternate group : 1
Encoded date : UTC 2022-02-23 15:18:42
Tagged date : UTC 2022-02-23 15:18:42

Other
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 8 min 52 s
Frame rate : 23.976 (24000/1001) FPS
Time code of first frame : 15:57:41:15
Time code, striped : Yes
Title : GoPro AVC 
Language : English
Default : No
Encoded date : UTC 2022-02-23 15:18:42
Tagged date : UTC 2022-02-23 15:18:42


Now if I run


ffmpeg -y -nostdin -v error -ss 00:00:00.042 -i GL0100002_output.mp4 -t 00:00:25.192 -map 0 -map -0:d -c:v libx264 -preset fast -crf 21 -c:a aac -sn GL0100002_test.DSME_0001.mp4

I get the following mediainfo


$ mediainfo GL0100002_test.DSME_0001.mp4 
General
Complete name : GL0100002_test.DSME_0001.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 4.54 MiB
Duration : 25 s 234 ms
Overall bit rate : 1 510 kb/s
Writing application : Lavf58.29.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 25 s 234 ms
Bit rate : 1 376 kb/s
Width : 848 pixels
Height : 480 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.141
Stream size : 4.14 MiB (91%)
Title : GoPro AVC 
Writing library : x264 core 155 r2917 0a84d98
Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / 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=12 / lookahead_threads=2 / 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=1 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Color range : Full
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 25 s 214 ms
Duration_LastFrame : -3 ms
Bit rate mode : Constant
Bit rate : 129 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 398 KiB (9%)
Title : GoPro AAC 
Language : English
Default : Yes
Alternate group : 1

Other
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 25 s 234 ms
Frame rate : 23.976 (24000/1001) FPS
Time code of first frame : 15:57:41:15
Time code, striped : Yes
Title : GoPro AVC 
Language : English
Default : No


But what I don't understand is where
Time code of first frameis coming from. I would expect it would be00:00:00.042or evenUTC 2022-02-23 15:18:42+ .042 but appear to be.

Time code of first frame : 15:57:41:15


Is this potentially clobbering together something to get this time that isn't obvious ?


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Why my ffmpeg video encode codes does not work on other computer ?
10 avril 2022, par Object UnknownI'm writing code to encode some cv::Mat images to a MP4 video. The program can run successfully in my computer which I developed it, but when I copied it (and all dlls it needs) to an other computer, it stopped work.


The function which reporting error : (I got it from StackOverflow, and added some changes)


int uns::VideoWriter::Remux()
{
 AVFormatContext* ifmt_ctx = NULL, * ofmt_ctx = NULL;
 int err = 0, ret = 0;
 int64_t ts = 0;
 AVStream* inVideoStream = NULL;
 AVStream* outVideoStream = NULL;
 if ((err = avformat_open_input(&ifmt_ctx, VIDEO_TMP_FILE.c_str(), 0, 0)) < 0)
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to open input file for remuxing", err);
 ret = -1;
 goto end;
 }
 if ((err = avformat_find_stream_info(ifmt_ctx, 0)) < 0) 
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to retrieve input stream information", err);
 ret = -2;
 goto end;
 }
 if ((err = avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, FINAL_FILE_NAME.c_str())))
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to allocate output context", err);
 ret = -3;
 goto end;
 }
 inVideoStream = ifmt_ctx->streams[0];
 outVideoStream = avformat_new_stream(ofmt_ctx, NULL);
 if (!outVideoStream) 
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to allocate output video stream", 0);
 ret = -4;
 goto end;
 }
 outVideoStream->time_base = { 1, fps };
 if ((err = avcodec_parameters_copy(outVideoStream->codecpar, inVideoStream->codecpar)) < 0)
 {
 if (callback != nullptr)
 callback("[uns::VideoWriter/Remux] Failed to copy stream information", err);
 return -4;
 goto end;
 }
 outVideoStream->codecpar->codec_tag = 0;
 if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) 
 {
 if ((err = avio_open(&ofmt_ctx->pb, FINAL_FILE_NAME.c_str(), AVIO_FLAG_WRITE)) < 0)
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to open output file", err);
 ret = -5;
 goto end;
 }
 }
 ofmt_ctx->streams[0]->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 ofmt_ctx->streams[0]->time_base.num = 1;
 ofmt_ctx->streams[0]->time_base.den = fps;
 if ((err = avformat_write_header(ofmt_ctx, 0)) < 0) 
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to write header to output file", err);
 ret = -6;
 goto end;
 }
 AVPacket videoPkt;
 while (true) 
 {
 if ((err = av_read_frame(ifmt_ctx, &videoPkt)) < 0) 
 {
 break;
 }
 videoPkt.stream_index = outVideoStream->index;
 videoPkt.pts = ts;
 videoPkt.dts = ts;
 videoPkt.duration = av_rescale_q(videoPkt.duration, inVideoStream->time_base, outVideoStream->time_base);
 ts += videoPkt.duration;
 videoPkt.pos = -1;
 if ((err = av_interleaved_write_frame(ofmt_ctx, &videoPkt)) < 0) 
 {
 if(callback != nullptr) 
 callback("[uns::VideoWriter/Remux] Failed to mux packet", err);
 av_packet_unref(&videoPkt);
 break;
 }
 av_packet_unref(&videoPkt);
 }
 av_write_trailer(ofmt_ctx);
end:
 if (ifmt_ctx) 
 {
 avformat_close_input(&ifmt_ctx);
 }
 if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) 
 {
 avio_closep(&ofmt_ctx->pb);
 }
 if (ofmt_ctx) 
 {
 avformat_free_context(ofmt_ctx);
 }
 return ret;
}


Notes :




callbackis a function which prints error messsage and error code.
The error I recived is
[uns::VideoWriter/Remux] Failed to write header to output file, error code: -22



I want to know what is causing this and how to resolve it please.


Other Informations :




Developing Env :




OS : Windows 11 Professional Workstation build 22593.ni_release

IDE : Visual Studio 2022

ffmpeg : 4.4.1

Installed ffmpeg library :
ffmpeg[avcodec],ffmpeg[avdevice],ffmpeg[avfilter],ffmpeg[avfilter],ffmpeg[avformat],ffmpeg[openh264],ffmpeg[swresample],ffmpeg[swscale]

Compile Settings : x64 Release







Running Env which causing error :




OS : Windows Server 2019 DataCenter

With all dlls VS2022 copied to release folder





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Two character glob pattern
18 octobre 2022, par eSlavkoI have camera capturing image every 10 seconds and store in folder with image name as timestamp like

/2022-05-10_19:11:50.jpg
Each week is stored in separate folder.
Now I want to make video from that images using ffmpeg.
It works with images declared as-pattern_type glob -i "*.jpg"Now I want to make video from images captured only in daytime. For example from images/2022-05-10_XX:11:50.jpgwhereXXis in range from 05, 06, 07 .. 20, 21. I try with glob patterns but seems that it can work only over single digit.

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