So I have been able to add a time code track using LibAV to my MOV file, but
it's not really behaving.
The first frame comes up with a time code, but after that, quicktime displays
N/A for every frame.
I'm wondering if there is something else I need to set.
AVStream * addTimeCodeStream(AVFormatContext * formatContext)
{
AVStream * stream;
AVCodecContext * codecContext;
codecContext = avcodec_alloc_context3(NULL);
codecContext->codec_type = AVMEDIA_TYPE_DATA;
codecContext->codec_id = AV_CODEC_ID_FFMETADATA;
codecContext->codec_tag = shiftFourCc("tmcd");
codecContext->thread_count = 1;
codecContext->flags = CODEC_FLAG_GLOBAL_HEADER;
codecContext->time_base.den = 23976;
codecContext->time_base.num = 1000;
stream = avformat_new_stream(formatContext, NULL);
stream->codec = codecContext;
return stream;
}
timeCodeStream = addTimeCodeStream(formatContext);
// write the header, this will create the file.
int headerWrite = avformat_write_header(formatContext, NULL);
// write the time code
AVPacket pkt;
av_new_packet(&pkt, 4);
int frameStart = 0;
AV_WB32(pkt.data, frameStart);
pkt.stream_index = timeCodeStream->index;
pkt.duration = timeCodeStream->codec->time_base.num;
pkt.flags = AV_PKT_FLAG_KEY;
int writeTimeCode = av_write_frame(formatContext, &pkt);
av_free_packet(&pkt);
Thanks again.
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Sent: Friday, November 15, 2013 3:00 AM
To: [email protected]
Subject: libav-api Digest, Vol 33, Issue 5
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Today's Topics:
1. Time Code in an MOV (Michael Kannard)
2. Re: Time Code in an MOV (Luca Barbato)
----------------------------------------------------------------------
Message: 1
Date: Thu, 14 Nov 2013 23:10:52 +0000
From: Michael Kannard <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [libav-api] Time Code in an MOV
Message-ID:
<7af7c2579aa7444781e7f3ac4e55f96c1b7ad...@bl2prd0810mb373.namprd08.prod.outlook.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello, I am new to LibAV.
I am writing an MOV file, and having problems getting time code embedded in the
file.
I am currently using the windows binaries.
Everything with the file comes out great, but no time code is available in
quick time.
I've seen some code posted that adds a dictionary item of "timecode" to the
metadata of the video stream, so I've added it here, but with no success.
Thanks to anyone who has some ideas.
AVStream * addVideoStream(AVFormatContext * formatContext, int width, int
height, const char * videoCodec, const char * videoCodecProfile, const char *
timeCode)
{
AVStream * stream;
AVCodec * codec;
AVCodecContext * codecContext;
codec = avcodec_find_encoder(AV_CODEC_ID_PRORES);
codecContext = avcodec_alloc_context3(codec);
codecContext->flags = CODEC_FLAG_GLOBAL_HEADER;
stream = avformat_new_stream(formatContext, codec);
stream->codec = codecContext;
int set = av_dict_set(&stream->metadata, "timecode", timeCode, 0);
codecContext->codec_id = AV_CODEC_ID_PRORES;
codecContext->channels = 0;
codecContext->width = width;
codecContext->height = height;
codecContext->time_base.den = 23976;
codecContext->time_base.num = 1000;
codecContext->codec_tag = getFourCc(videoCodec, videoCodecProfile);
codecContext->pix_fmt = codec->pix_fmts[0];
return stream;
}
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------------------------------
Message: 2
Date: Fri, 15 Nov 2013 00:39:07 +0100
From: Luca Barbato <[email protected]>
To: [email protected]
Subject: Re: [libav-api] Time Code in an MOV
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
On 15/11/13 00:10, Michael Kannard wrote:
> Hello, I am new to LibAV.
>
>
>
> I am writing an MOV file, and having problems getting time code
> embedded in the file.
>
> I am currently using the windows binaries.
>
> Everything with the file comes out great, but no time code is
> available in quick time.
>
>
>
> I've seen some code posted that adds a dictionary item of "timecode"
> to the metadata of the video stream, so I've added it here, but with
> no success.
Timecode is considered a data stream thus saved and copied accordingly.
Probably could make sense to decode it and use it as metadata.
lu
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