Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On Wed, Oct 29, 2014 at 10:27:25AM +0100, tomas.har...@codemill.se wrote: > On 2014-10-28 23:38, Thomas Mundt wrote: > >Carl Eugen, I changed the indentations and attached a unified diff. > >Since I´m on windows I used turtoise git. I hope that´s okay. > > > >Regards, > >Thomas > > Looks good to me applied thanks [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB The real ebay dictionary, page 1 "Used only once"- "Some unspecified defect prevented a second use" "In good condition" - "Can be repaird by experienced expert" "As is" - "You wouldnt want it even if you were payed for it, if you knew ..." signature.asc Description: Digital signature ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On 2014-10-28 23:38, Thomas Mundt wrote: Carl Eugen, I changed the indentations and attached a unified diff. Since I´m on windows I used turtoise git. I hope that´s okay. Regards, Thomas Looks good to me /Tomas ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
Carl Eugen, I changed the indentations and attached a unified diff. Since I´m on windows I used turtoise git. I hope that´s okay. Regards, Thomas avci_mxf.diff Description: Binary data ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
Okay. I will do so next patch. ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On Tuesday 28 October 2014 03:36:05 pm Thomas Mundt wrote:
> -mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
> -// bit rate
> -mxf_write_local_tag(pb, 4, 0x8000);
> -avio_wb32(pb, sc->video_bit_rate);
> -
> -// profile and level
> -mxf_write_local_tag(pb, 1, 0x8007);
> -if (!st->codec->profile)
> -profile_and_level |= 0x80; // escape bit
> -avio_w8(pb, profile_and_level);
It makes reviewing your patch much easier if you do not re-indent
these lines: Just leave them unchanged, consider sending a
followup to fix the indentation.
(Or leave it to the committer.)
> +}
> +else
> +mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 0);
While here, please make this:
} else {
mxf_write_cdci_common(=;
}
to follow the preferred coding style.
And please consider to commit your patch locally, create a
patchfile with "git format-patch HEAD^" and attach it to your
mail.
Thank you, Carl Eugen
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Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
I´m not happy with the for-loop I coded yesterday night, so I made a new patch.
Regards,
Thomas
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -42,6 +42,8 @@
#include "libavutil/time_internal.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/dnxhddata.h"
+#include "libavcodec/h264.h"
+#include "libavcodec/internal.h"
#include "audiointerleave.h"
#include "avformat.h"
#include "avio_internal.h"
@@ -98,6 +100,7 @@
{ AV_CODEC_ID_DVVIDEO, 15 },
{ AV_CODEC_ID_DNXHD, 24 },
{ AV_CODEC_ID_JPEG2000, 34 },
+{ AV_CODEC_ID_H264, 35 },
{ AV_CODEC_ID_NONE }
};
@@ -274,6 +277,11 @@
{
0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x08,0x00
},
{
0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00
},
mxf_write_cdci_desc },
+// H.264
+{ {
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x0D,0x01,0x03,0x01,0x02,0x10,0x60,0x01
},
+ {
0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00
},
+ {
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00
},
+ mxf_write_mpegvideo_desc },
{ {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
@@ -989,17 +997,21 @@
MXFStreamContext *sc = st->priv_data;
int profile_and_level = (st->codec->profile<<4) | st->codec->level;
-mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
+if (st->codec->codec_id != AV_CODEC_ID_H264) {
+mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
-// bit rate
-mxf_write_local_tag(pb, 4, 0x8000);
-avio_wb32(pb, sc->video_bit_rate);
-
-// profile and level
-mxf_write_local_tag(pb, 1, 0x8007);
-if (!st->codec->profile)
-profile_and_level |= 0x80; // escape bit
-avio_w8(pb, profile_and_level);
+// bit rate
+mxf_write_local_tag(pb, 4, 0x8000);
+avio_wb32(pb, sc->video_bit_rate);
+
+// profile and level
+mxf_write_local_tag(pb, 1, 0x8007);
+if (!st->codec->profile)
+profile_and_level |= 0x80; // escape bit
+avio_w8(pb, profile_and_level);
+}
+else
+mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 0);
}
static void mxf_write_generic_sound_common(AVFormatContext *s, AVStream *st,
const UID key, unsigned size)
@@ -1572,6 +1584,96 @@
return 1;
}
+static const struct {
+UID uid;
+int frame_size;
+int profile;
+uint8_t interlaced;
+} mxf_h264_codec_uls[] = {
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x20,0x01
}, 0, 110, 0 }, // AVC High 10 Intra
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x01
}, 232960, 0, 1 }, // AVC Intra 50 1080i60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x02
}, 281088, 0, 1 }, // AVC Intra 50 1080i50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x03
}, 232960, 0, 0 }, // AVC Intra 50 1080p30
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x04
}, 281088, 0, 0 }, // AVC Intra 50 1080p25
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x08
}, 116736, 0, 0 }, // AVC Intra 50 720p60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x09
}, 140800, 0, 0 }, // AVC Intra 50 720p50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x30,0x01
}, 0, 122, 0 }, // AVC High 422 Intra
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x01
}, 472576, 0, 1 }, // AVC Intra 100 1080i60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x02
}, 568832, 0, 1 }, // AVC Intra 100 1080i50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x03
}, 472576, 0, 0 }, // AVC Intra 100 1080p30
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x04
}, 568832, 0, 0 }, // AVC Intra 100 1080p25
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x08
}, 236544, 0, 0 }, // AVC Intra 100 720p60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x09
}, 284672, 0, 0 }, // AVC Intra 100 720p50
+};
+
+static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
+AVPacket *pkt, MXFIndexEntry *e)
+{
+MXFContext *mxf = s->priv_data;
+MXFStreamContext *sc = st->priv_data;
+static const int mxf_h264_num_codec_uls =
sizeof(mxf_h264_codec_uls)/sizeof(mxf_h264_codec_uls[0]);
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
@ Michael: Sorry, I`m subscribed now. CODEC_ID_H264 changed.
@ Kieran: Maybe this would make sense as an option. But in a future step. :-)
@ Tomas:Thanks for your suggestions!The component_depth part was taken from
Michael´s patch last month. But it also can be changed to 10 bit fixed for AVCI.
Here is the new patch:
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -42,6 +42,8 @@
#include "libavutil/time_internal.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/dnxhddata.h"
+#include "libavcodec/h264.h"
+#include "libavcodec/internal.h"
#include "audiointerleave.h"
#include "avformat.h"
#include "avio_internal.h"
@@ -98,6 +100,7 @@
{ AV_CODEC_ID_DVVIDEO, 15 },
{ AV_CODEC_ID_DNXHD, 24 },
{ AV_CODEC_ID_JPEG2000, 34 },
+{ AV_CODEC_ID_H264, 35 },
{ AV_CODEC_ID_NONE }
};
@@ -274,6 +277,11 @@
{
0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x08,0x00
},
{
0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00
},
mxf_write_cdci_desc },
+// H.264
+{ {
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x0D,0x01,0x03,0x01,0x02,0x10,0x60,0x01
},
+ {
0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00
},
+ {
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00
},
+ mxf_write_mpegvideo_desc },
{ {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
@@ -989,17 +997,21 @@
MXFStreamContext *sc = st->priv_data;
int profile_and_level = (st->codec->profile<<4) | st->codec->level;
-mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
+if (st->codec->codec_id != AV_CODEC_ID_H264) {
+mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
-// bit rate
-mxf_write_local_tag(pb, 4, 0x8000);
-avio_wb32(pb, sc->video_bit_rate);
-
-// profile and level
-mxf_write_local_tag(pb, 1, 0x8007);
-if (!st->codec->profile)
-profile_and_level |= 0x80; // escape bit
-avio_w8(pb, profile_and_level);
+// bit rate
+mxf_write_local_tag(pb, 4, 0x8000);
+avio_wb32(pb, sc->video_bit_rate);
+
+// profile and level
+mxf_write_local_tag(pb, 1, 0x8007);
+if (!st->codec->profile)
+profile_and_level |= 0x80; // escape bit
+avio_w8(pb, profile_and_level);
+}
+else
+mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 0);
}
static void mxf_write_generic_sound_common(AVFormatContext *s, AVStream *st,
const UID key, unsigned size)
@@ -1572,6 +1584,88 @@
return 1;
}
+static const struct {
+UID uid;
+int frame_size;
+int profile;
+uint8_t interlaced;
+} mxf_h264_codec_uls[] = {
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x01
}, 232960, 0, 1 }, // AVC Intra 50 1080i60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x02
}, 281088, 0, 1 }, // AVC Intra 50 1080i50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x03
}, 232960, 0, 0 }, // AVC Intra 50 1080p30
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x04
}, 281088, 0, 0 }, // AVC Intra 50 1080p25
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x08
}, 116736, 0, 0 }, // AVC Intra 50 720p60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x09
}, 140800, 0, 0 }, // AVC Intra 50 720p50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x01
}, 472576, 0, 1 }, // AVC Intra 100 1080i60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x02
}, 568832, 0, 1 }, // AVC Intra 100 1080i50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x03
}, 472576, 0, 0 }, // AVC Intra 100 1080p30
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x04
}, 568832, 0, 0 }, // AVC Intra 100 1080p25
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x08
}, 236544, 0, 0 }, // AVC Intra 100 720p60
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x09
}, 284672, 0, 0 }, // AVC Intra 100 720p50
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x20,0x01
}, 0, 110, 0 }, // AVC High 10 Intra
+{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x30,0x01
}, 0, 122, 0 }, // AVC High 422 Intra
+};
+
+static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
+
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On Mon, Oct 27, 2014 at 05:21:12PM +, Thomas Mundt wrote:
> Hi, I´ve seen that there has been approach last month to implement AVC Intra
> mxf muxing. I tested the patches, but it didn´t work with any of my samples.
> Since there also has been discussions about the gpl restriction, I rewrote
> the patch. I had some basics, because I had written a working patch for
> myself some time ago, which was more of a hack and only worked with AVCI100
> 1080i50.
> I hope this could be licenced to lgpl, because I got all labels from libmxf
> and libbmx and only used code snippets from avcodec/h264_parser.c
> To keep h264 parsing simple and fast, I used the framesize for selecting the
> right Panasonic codec label. The framesize is fixed for Panasonic AVC Intra.
>
> This patch only supports AVCI50/100. But in all flavours, i.e. with no
> SPS/PPS in header.
>
> http://pastebin.com/v7gF1vDq
-AVIOContext *pb = s->pb;
-MXFStreamContext *sc = st->priv_data;
-int profile_and_level = (st->codec->profile<<4) | st->codec->level;
+if (st->codec->codec_id != CODEC_ID_H264) {
this should be AV_CODEC_ID_H264
also i suggest you subscribe to the mailing list, so your mails arent
held in the moderation que and you see replies (there where several
already)
Thanks
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
What does censorship reveal? It reveals fear. -- Julian Assange
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Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On 27 October 2014 17:21, Thomas Mundt wrote: > Hi, I´ve seen that there has been approach last month to implement AVC Intra > mxf muxing. I tested the patches, but it didn´t work with any of my samples. > Since there also has been discussions about the gpl restriction, I rewrote > the patch. I had some basics, because I had written a working patch for > myself some time ago, which was more of a hack and only worked with AVCI100 > 1080i50. Hi, I'm wondering whether you should add headers yourself. It would of course be nicer but does it change compatibility? Regards, Kieran Kunhya ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
On Mon, 2014-10-27 at 17:21 +, Thomas Mundt wrote:
> Hi, I´ve seen that there has been approach last month to implement AVC Intra
> mxf muxing. I tested the patches, but it didn´t work with any of my samples.
> Since there also has been discussions about the gpl restriction, I rewrote
> the patch. I had some basics, because I had written a working patch for
> myself some time ago, which was more of a hack and only worked with AVCI100
> 1080i50.
> I hope this could be licenced to lgpl, because I got all labels from libmxf
> and libbmx and only used code snippets from avcodec/h264_parser.c
> To keep h264 parsing simple and fast, I used the framesize for selecting the
> right Panasonic codec label. The framesize is fixed for Panasonic AVC Intra.
>
> This patch only supports AVCI50/100. But in all flavours, i.e. with no
> SPS/PPS in header.
>
> http://pastebin.com/v7gF1vDq
>
> Thomas
Could you rewrite it so you don't mix functional changes with
indentation changes? See mxf_write_mpegvideo_desc()
>
> +switch (pkt->size + extrasize) {
> +case 116736: // AVCI50 720p60
> +sc->codec_ul = &mxf_h264_codec_uls[5];
> +break;
> +case 140800: // AVCI50 720p50
> +sc->codec_ul = &mxf_h264_codec_uls[6];
> +break;
The magic values here stink. You should stick them next to
mxf_h264_codec_uls, perhaps using a struct like so:
static const struct {
UID uid;
int packet_size;
int profile;
uint8_t interlaced;
} mxf_h264_codec_uls[] = {
{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x20,0x01
}, 0, 110, 0}, // AVC Intra 50 High 10
{{
0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x01
}, 232960, 0, 1}, // AVC Intra 50 1080i60
//etc etc
};
static const int mxf_h264_num_codec_uls =
sizeof(mxf_h264_codec_uls)/sizeof(mxf_h264_codec_uls[0]);
Then use a little for loop in mxf_parse_h264_frame() to find the
matching entry.
> +if (desc)
> +sc->component_depth = desc->comp[0].depth_minus1 + 1;
Seems unrelated?
In general I didn't check how similar this patch is to the GPL'd
version, so I'm going to trust that this doesn't share anything (except
the ULs, which come from the standards).
/Tomas
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[FFmpeg-devel] [PATCH] avformat/mxfenc: AVC Intra support
Hi, I´ve seen that there has been approach last month to implement AVC Intra mxf muxing. I tested the patches, but it didn´t work with any of my samples. Since there also has been discussions about the gpl restriction, I rewrote the patch. I had some basics, because I had written a working patch for myself some time ago, which was more of a hack and only worked with AVCI100 1080i50. I hope this could be licenced to lgpl, because I got all labels from libmxf and libbmx and only used code snippets from avcodec/h264_parser.c To keep h264 parsing simple and fast, I used the framesize for selecting the right Panasonic codec label. The framesize is fixed for Panasonic AVC Intra. This patch only supports AVCI50/100. But in all flavours, i.e. with no SPS/PPS in header. http://pastebin.com/v7gF1vDq Thomas ffmpeg avci mxf patch - Pastebin.com --- a/libavformat/mxfenc.c +++ b/libavformat/mxfenc.c @@ -40,8 +40,11 @@ #include "libavutil/timecode.h" #include "libavutil/avassert.h" #include "libavutil/ti... Auf pastebin.com anzeigen Vorschau nach Yahoo ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
