Process GIF using FFmpeg libraries - can't find parser at av_parser_init
0
I am playing with ffmpeg libs, namely libswscale and libavcodec for now. My goal is resize GIF files. From my ridiculous understanding, I think I need to
- decode the GIF and get an AVFrame
- process the frame with libswscale
- encode again into GIF
But I am stuck at step 1. Based on official sample at https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_video.c , I need to get a parser:
codec = avcodec_find_decoder(AV_CODEC_ID_GIF);
parser = av_parser_init(codec->id);
But no parser is found. I am not touching parser in my configure call, so I take all:
Enabled parsers:
aac cavsvideo dvbsub h263 mpegvideo sipr xma
aac_latm cook dvd_nav h264 opus tak
ac3 dca dvdsub hevc png vc1
adx dirac flac mjpeg pnm vorbis
av1 dnxhd g729 mlp rv30 vp3
avs2 dpx gsm mpeg4video rv40 vp8
bmp dvaudio h261 mpegaudio sbc vp9
What am I doing wrong? If this is the wrong approach, what is the correct one?
c++ ffmpeg gif libavcodec swscale
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
|
show 3 more comments
0
I am playing with ffmpeg libs, namely libswscale and libavcodec for now. My goal is resize GIF files. From my ridiculous understanding, I think I need to
- decode the GIF and get an AVFrame
- process the frame with libswscale
- encode again into GIF
But I am stuck at step 1. Based on official sample at https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_video.c , I need to get a parser:
codec = avcodec_find_decoder(AV_CODEC_ID_GIF);
parser = av_parser_init(codec->id);
But no parser is found. I am not touching parser in my configure call, so I take all:
Enabled parsers:
aac cavsvideo dvbsub h263 mpegvideo sipr xma
aac_latm cook dvd_nav h264 opus tak
ac3 dca dvdsub hevc png vc1
adx dirac flac mjpeg pnm vorbis
av1 dnxhd g729 mlp rv30 vp3
avs2 dpx gsm mpeg4video rv40 vp8
bmp dvaudio h261 mpegaudio sbc vp9
What am I doing wrong? If this is the wrong approach, what is the correct one?
c++ ffmpeg gif libavcodec swscale
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handlesAV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.
– natario
Nov 24 '18 at 18:13
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09
|
show 3 more comments
0
0
0
I am playing with ffmpeg libs, namely libswscale and libavcodec for now. My goal is resize GIF files. From my ridiculous understanding, I think I need to
- decode the GIF and get an AVFrame
- process the frame with libswscale
- encode again into GIF
But I am stuck at step 1. Based on official sample at https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_video.c , I need to get a parser:
codec = avcodec_find_decoder(AV_CODEC_ID_GIF);
parser = av_parser_init(codec->id);
But no parser is found. I am not touching parser in my configure call, so I take all:
Enabled parsers:
aac cavsvideo dvbsub h263 mpegvideo sipr xma
aac_latm cook dvd_nav h264 opus tak
ac3 dca dvdsub hevc png vc1
adx dirac flac mjpeg pnm vorbis
av1 dnxhd g729 mlp rv30 vp3
avs2 dpx gsm mpeg4video rv40 vp8
bmp dvaudio h261 mpegaudio sbc vp9
What am I doing wrong? If this is the wrong approach, what is the correct one?
c++ ffmpeg gif libavcodec swscale
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
I am playing with ffmpeg libs, namely libswscale and libavcodec for now. My goal is resize GIF files. From my ridiculous understanding, I think I need to
- decode the GIF and get an AVFrame
- process the frame with libswscale
- encode again into GIF
But I am stuck at step 1. Based on official sample at https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_video.c , I need to get a parser:
codec = avcodec_find_decoder(AV_CODEC_ID_GIF);
parser = av_parser_init(codec->id);
But no parser is found. I am not touching parser in my configure call, so I take all:
Enabled parsers:
aac cavsvideo dvbsub h263 mpegvideo sipr xma
aac_latm cook dvd_nav h264 opus tak
ac3 dca dvdsub hevc png vc1
adx dirac flac mjpeg pnm vorbis
av1 dnxhd g729 mlp rv30 vp3
avs2 dpx gsm mpeg4video rv40 vp8
bmp dvaudio h261 mpegaudio sbc vp9
What am I doing wrong? If this is the wrong approach, what is the correct one?
c++ ffmpeg gif libavcodec swscale
c++ ffmpeg gif libavcodec swscale
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
asked Nov 24 '18 at 17:50
natarionatario
17.2k967130
17.2k967130
(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handlesAV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.
– natario
Nov 24 '18 at 18:13
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09
|
show 3 more comments
(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handlesAV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.
– natario
Nov 24 '18 at 18:13
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09
(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handles
AV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.– natario
Nov 24 '18 at 18:13
(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handles
AV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.– natario
Nov 24 '18 at 18:13
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09
|
show 3 more comments
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(to close voter) How is it unclear what I am asking? I am asking why there's no parser that handles
AV_CODEC_ID_GIF, but also giving context around this because the whole approach I took might be wrong for my goal. I just don't know.– natario
Nov 24 '18 at 18:13
Maybe this helps. And docs
– Ripi2
Nov 24 '18 at 18:29
@Ripi2 thanks. But I am using ffmpeg 4.1 where this function is deprecated and is a no-op. Even if I add nothing changes. It's not clear to me which one (in the list I attached) should be the correct parser for gifs. Apparently no-one?
– natario
Nov 24 '18 at 18:38
No parser needed for GIF. The decoder parses the bitstream for the next image or extension.
– Gyan
Nov 24 '18 at 18:59
Thanks @Gyan . How to use the decoder then? I was following lines 161-171 from the official sample. Feel free to post an answer
– natario
Nov 24 '18 at 19:09